{"tools": [{"slug": "grams-to-ounces-converter", "name": "Grams to Ounces Converter", "category": "math", "subcategory": "Unit Converters", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert grams to ounces, pounds, kilograms, and milligrams."}, {"slug": "ounce-to-gram-converter", "name": "Ounce to Gram Converter", "category": "math", "subcategory": "Unit Converters", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert ounces to grams, kilograms, milligrams, and pounds."}, {"slug": "square-feet-to-acres-converter", "name": "Square Feet to Acres Converter", "category": "math", "subcategory": "Area", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert square feet to acres and related land-area units."}, {"slug": "square-miles-to-acres-converter", "name": "Square Miles to Acres Converter", "category": "math", "subcategory": "Area", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert square miles to acres and related land-area units."}, {"slug": "hectares-to-acres-converter", "name": "Hectares to Acres Converter", "category": "math", "subcategory": "Area", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert hectares to acres and related land-area units."}, {"slug": "square-meters-to-acres-converter", "name": "Square Meters to Acres Converter", "category": "math", "subcategory": "Area", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert square meters to acres and related land-area units."}, {"slug": "tablespoons-to-cups-converter", "name": "Tablespoons to Cups Converter", "category": "math", "subcategory": "Unit Converters", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert US tablespoons to cups, teaspoons, fluid ounces, and milliliters."}, {"slug": "tablespoons-to-teaspoons-converter", "name": "Tablespoons to Teaspoons Converter", "category": "math", "subcategory": "Unit Converters", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert US tablespoons to teaspoons, cups, fluid ounces, and milliliters."}, {"slug": "teaspoons-to-tablespoons-converter", "name": "Teaspoons to Tablespoons Converter", "category": "math", "subcategory": "Unit Converters", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert US teaspoons to tablespoons, cups, fluid ounces, and milliliters."}, {"slug": "radian-to-degree-converter", "name": "Radian to Degree Converter", "category": "math", "subcategory": "Angles", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert radians, fractions, or pi expressions to degrees."}, {"slug": "absolute-value-calculator", "name": "Absolute Value Calculator", "category": "math", "subcategory": "Basic Math", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate the absolute value of a real or complex number."}, {"slug": "acres-to-hectares-converter", "name": "Acres to Hectares Converter", "category": "math", "subcategory": "Unit Converters", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert between acres and hectares with related area units."}, {"slug": "acres-to-square-feet-converter", "name": "Acres to Square Feet Converter", "category": "math", "subcategory": "Unit Converters", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert between acres and square feet with related area units."}, {"slug": "acres-to-square-meters-converter", "name": "Acres to Square Meters Converter", "category": "math", "subcategory": "Unit Converters", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert between acres and square meters with related area units."}, {"slug": "area-of-a-circle-calculator", "name": "Area of a Circle Calculator", "category": "math", "subcategory": "Geometry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate circle radius, diameter, circumference, and area from one value."}, {"slug": "area-of-a-trapezoid-calculator", "name": "Area of a Trapezoid Calculator", "category": "math", "subcategory": "Geometry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate trapezoid area from two parallel bases and height."}, {"slug": "area-of-an-ellipse-calculator", "name": "Area of an Ellipse Calculator", "category": "math", "subcategory": "Geometry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate ellipse area, Ramanujan perimeter, foci, and eccentricity."}, {"slug": "arc-length-calculator", "name": "Arc Length Calculator", "category": "math", "subcategory": "Geometry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Solve arc length, radius, or central angle for a circle sector."}, {"slug": "area-of-a-sector-calculator", "name": "Area of a Sector Calculator", "category": "math", "subcategory": "Geometry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate sector area, arc length, perimeter, chord, and segment area."}, {"slug": "acreage-calculator", "name": "Acreage Calculator", "category": "math", "subcategory": "Area", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate land acreage from rectangle, triangle, or circle dimensions."}, {"slug": "carpet-calculator", "name": "Carpet Calculator", "category": "construction", "subcategory": "Materials", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimate carpet area, waste, roll length, padding, installation, and cost."}, {"slug": "decking-calculator", "name": "Decking Calculator", "category": "construction", "subcategory": "Materials", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimate decking boards, joists, beams, posts, fasteners, and waste."}, {"slug": "square-footage-calculator", "name": "Square Footage Calculator", "category": "math", "subcategory": "Area", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate square footage for common room, lot, and curved shapes."}, {"slug": "tile-calculator", "name": "Tile Calculator", "category": "construction", "subcategory": "Materials", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimate tile count, boxes, grout, adhesive, sealer, waste, and optional cost."}, {"slug": "wallpaper-calculator", "name": "Wallpaper Calculator", "category": "construction", "subcategory": "Materials", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimate wallpaper drops, rolls, waste, coverage, and optional cost."}, {"slug": "voltage-divider-calculator", "name": "Voltage Divider Calculator", "category": "electronics", "subcategory": "Circuits", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate voltage divider output or solve for R1 or R2."}, {"slug": "voltage-drop-calculator", "name": "Voltage Drop Calculator", "category": "electronics", "subcategory": "Wiring", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate electrical voltage drop for AWG copper or aluminum wire runs."}, {"slug": "transformer-calculator", "name": "Transformer Calculator", "category": "electronics", "subcategory": "Circuits", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate transformer turns ratio, secondary voltage, current, power, and impedance ratio."}, {"slug": "torque-converter-nm-ft-lb-kgf-cm", "name": "Torque Converter", "category": "converters", "subcategory": "Torque", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert torque between Nm, ft-lb, in-lb, kgf-cm, kgf-m, dyn-cm, oz-in, and oz-ft."}, {"slug": "cups-to-grams-converter", "name": "Cups to Grams Converter", "category": "cooking", "subcategory": "Conversion", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert cups to grams for common cooking ingredients."}, {"slug": "dough-hydration-calculator", "name": "Dough Hydration Calculator", "category": "cooking", "subcategory": "Baking", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate dough hydration, required water, or a simple baker's percentage recipe."}, {"slug": "decimal-to-time-converter", "name": "Decimal to Time Converter", "category": "datetime", "subcategory": "Time", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert decimal hours to hours, minutes, and seconds."}, {"slug": "fuel-efficiency-converter-mpg-l-100km-km-l", "name": "Fuel Efficiency Converter", "category": "conversion", "subcategory": "Fuel", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert MPG, L/100km, km/L, and miles/L fuel-efficiency values."}, {"slug": "fraction-to-mixed-number-converter", "name": "Fraction to Mixed Number Converter", "category": "math", "subcategory": "Fractions", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert an improper fraction to a simplified mixed number."}, {"slug": "factorial-calculator", "name": "Factorial Calculator", "category": "math", "subcategory": "Number Theory", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate factorial metadata, exact values for bounded inputs, and scientific notation."}, {"slug": "fibonacci-number-checker", "name": "Fibonacci Number Checker", "category": "math", "subcategory": "Number Theory", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Check whether a non-negative integer is in the Fibonacci sequence."}, {"slug": "doubling-time-calculator", "name": "Doubling Time Calculator", "category": "finance", "subcategory": "Interest", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate exact doubling time, Rule of 72 estimates, or the rate required to double."}, {"slug": "exponential-growth-calculator", "name": "Exponential Growth Calculator", "category": "math", "subcategory": "Advanced", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Solve continuous exponential growth equations for final amount, initial amount, rate, or time."}, {"slug": "exponential-decay-calculator", "name": "Exponential Decay Calculator", "category": "math", "subcategory": "Advanced", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Solve continuous exponential decay equations for final amount, initial amount, rate, or time."}, {"slug": "angle-converter", "name": "Angle Converter", "category": "math", "subcategory": "Unit Converters", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert angles between degrees, radians, gradians, turns, arcminutes, arcseconds, and milliradians."}, {"slug": "decimal-to-octal-converter", "name": "Decimal to Octal Converter", "category": "math", "subcategory": "Number Systems", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert a base-10 integer to octal with division steps."}, {"slug": "teaspoons-to-cups-converter", "name": "Teaspoons to Cups Converter", "category": "math", "subcategory": "Unit Converters", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert US teaspoons and cups, including tablespoons and fluid ounces."}, {"slug": "cups-to-tablespoons-converter", "name": "Cups to Tablespoons Converter", "category": "math", "subcategory": "Unit Converters", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert US cups and tablespoons, including teaspoons and fluid ounces."}, {"slug": "gallons-to-cups-converter", "name": "Gallons to Cups Converter", "category": "math", "subcategory": "Unit Converters", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert US gallons and cups, with quart and pint equivalents."}, {"slug": "rgb-to-hex-converter", "name": "RGB to Hex Converter", "category": "dev", "subcategory": "Color", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert RGB channels to hex, HSL, HSV, CMYK, and relative luminance."}, {"slug": "remove-accent", "name": "Remove Accent", "category": "text", "subcategory": "Modification", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Remove accents and combining marks from Unicode text."}, {"slug": "acres-to-square-yards-converter", "name": "Acres to Square Yards Converter", "category": "math", "subcategory": "Unit Converters", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert acres and square yards, including related area units."}, {"slug": "acres-to-square-miles-converter", "name": "Acres to Square Miles Converter", "category": "math", "subcategory": "Unit Converters", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert acres and square miles, including related land-area units."}, {"slug": "acres-to-perches-converter", "name": "Acres to Perches Converter", "category": "math", "subcategory": "Unit Converters", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert acres and perches for land area calculations."}, {"slug": "perches-to-acres-converter", "name": "Perches to Acres Converter", "category": "math", "subcategory": "Unit Converters", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert perches and acres for land area calculations."}, {"slug": "square-yards-to-acres-converter", "name": "Square Yards to Acres Converter", "category": "math", "subcategory": "Unit Converters", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert square yards and acres, including related area units."}, {"slug": "psi-to-kpa-converter", "name": "psi to kPa Converter", "category": "science", "subcategory": "Pressure", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert pounds per square inch to kilopascals and related pressure units."}, {"slug": "bar-to-psi-converter", "name": "Bar to PSI Converter", "category": "science", "subcategory": "Pressure", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert bar and PSI, including kPa, MPa, atm, torr, inHg, and Pa."}, {"slug": "cm-to-inches-converter", "name": "CM to Inches Converter", "category": "math", "subcategory": "Unit Converters", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert centimeters to inches, feet/inches, and nearest 1/16-inch fraction."}, {"slug": "binary-to-decimal-converter", "name": "Binary to Decimal Converter", "category": "math", "subcategory": "Number Systems", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert a binary number to decimal, hexadecimal, and octal."}, {"slug": "binary-to-hex-converter", "name": "Binary to Hex Converter", "category": "math", "subcategory": "Number Systems", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert a binary number to hexadecimal with nibble grouping."}, {"slug": "antilog-calculator", "name": "Antilog Calculator", "category": "math", "subcategory": "Advanced Math", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate an antilogarithm as base raised to an exponent."}, {"slug": "arccos-calculator", "name": "Arccos Calculator", "category": "math", "subcategory": "Trigonometry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate inverse cosine in radians and degrees."}, {"slug": "arctan-calculator", "name": "Arctan Calculator", "category": "math", "subcategory": "Trigonometry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate inverse tangent in radians and degrees."}, {"slug": "angle-between-vectors-calculator", "name": "Angle Between Vectors Calculator", "category": "math", "subcategory": "Linear Algebra", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate the angle between two 2D or 3D vectors."}, {"slug": "angle-bisector-calculator", "name": "Angle Bisector Calculator", "category": "math", "subcategory": "Geometry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate triangle angle bisectors, angles, area, and inradius from side lengths."}, {"slug": "baker-s-percentage-calculator", "name": "Baker's Percentage Calculator", "category": "cooking", "subcategory": "Ratios", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Scale bread ingredients from flour weight and baker's percentages."}, {"slug": "batting-average-calculator", "name": "Batting Average Calculator", "category": "sports", "subcategory": "Baseball", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate baseball batting average from hits and at-bats."}, {"slug": "binomial-coefficient-calculator", "name": "Binomial Coefficient Calculator", "category": "math", "subcategory": "Combinatorics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate C(n, k), the number of combinations choosing k items from n."}, {"slug": "board-foot-calculator", "name": "Board Foot Calculator", "category": "construction", "subcategory": "Lumber", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate lumber volume in board feet, cubic volume, weight, and optional cost."}, {"slug": "battery-life-calculator", "name": "Battery Life Calculator", "category": "electronics", "subcategory": "Runtime", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimate battery runtime from capacity, consumption, and efficiency."}, {"slug": "555-timer-calculator", "name": "555 Timer Calculator", "category": "science", "subcategory": "Electronics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate 555 timer astable frequency, period, duty cycle, or monostable pulse width."}, {"slug": "astronomical-unit-converter", "name": "Astronomical Unit Converter", "category": "science", "subcategory": "Astronomy", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert astronomical distances among AU, light-time, parsecs, kilometers, and miles."}, {"slug": "butter-to-oil-converter", "name": "Butter to Oil Converter", "category": "math", "subcategory": "Cooking", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert butter quantities to practical oil equivalents for baking."}, {"slug": "capacitor-calculator", "name": "Capacitor Calculator", "category": "science", "subcategory": "Electronics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate capacitor charge, stored energy, reactance, RC timing, or decode ceramic capacitor codes."}, {"slug": "sine-calculator", "name": "Sine Calculator", "category": "math", "subcategory": "Trigonometry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate sine with radians/degrees conversion, quadrant, and special-angle recognition."}, {"slug": "cosine-calculator", "name": "Cosine Calculator", "category": "math", "subcategory": "Trigonometry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate cosine with radians/degrees conversion, quadrant, and special-angle recognition."}, {"slug": "tangent-calculator", "name": "Tangent Calculator", "category": "math", "subcategory": "Trigonometry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate tangent and flag vertical-asymptote inputs."}, {"slug": "cpc-calculator", "name": "CPC Calculator", "category": "webmaster", "subcategory": "Advertising", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate CPC, CPM, or CTR from two known campaign metrics."}, {"slug": "cpm-calculator", "name": "CPM Calculator", "category": "webmaster", "subcategory": "Advertising", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate campaign cost, CPM, or impressions from two known advertising metrics."}, {"slug": "pythagorean-theorem-calculator", "name": "Pythagorean Theorem Calculator", "category": "math", "subcategory": "Geometry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Find a missing right-triangle side and calculate area, perimeter, and angles."}, {"slug": "daily-time-savings-calculator", "name": "Daily Time Savings Calculator", "category": "miscellaneous", "subcategory": "Time", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate yearly, monthly, and weekly time saved from a small daily savings habit."}, {"slug": "angel-number-calculator", "name": "Angel Number Calculator", "category": "lifestyle", "subcategory": "Numerology", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Find recurring angel-number interpretations or derive one from a birth date."}, {"slug": "anova-calculator", "name": "ANOVA Calculator", "category": "math", "subcategory": "Statistics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Run one-way ANOVA with F statistic, p-value, table components, and effect sizes."}, {"slug": "ascii-art-generator", "name": "ASCII Art Generator", "category": "text", "subcategory": "Formatting", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Generate deterministic ASCII banner art from short text."}, {"slug": "autumnal-equinox-day", "name": "Autumnal Equinox Day", "category": "datetime", "subcategory": "Seasons", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Return autumn equinox date, UTC time, seasonal markers, and optional countdown data."}, {"slug": "bac-calculator", "name": "BAC Calculator", "category": "lifestyle", "subcategory": "Health", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimate blood alcohol content using standard-drink counts and the Widmark formula."}, {"slug": "bar-graph-maker", "name": "Bar Graph Maker", "category": "math", "subcategory": "Charts", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Prepare normalized bar-chart data from labels and numeric values."}, {"slug": "bench-press-calculator", "name": "Bench Press Calculator", "category": "lifestyle", "subcategory": "Fitness", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimate bench press one-rep max, formula comparisons, and training zones."}, {"slug": "biological-age-calculator", "name": "Biological Age Calculator", "category": "lifestyle", "subcategory": "Health", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimate biological age from lifestyle and health-factor adjustments."}, {"slug": "bmr-calculator", "name": "BMR Calculator", "category": "lifestyle", "subcategory": "Fitness", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate BMR, RMR estimate, TDEE, macro estimates, and activity-level calorie needs."}, {"slug": "log-base-10-calculator", "name": "Log Base 10 Calculator", "category": "math", "subcategory": "Logarithms", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate common logarithms with bounds and an antilog check."}, {"slug": "log-base-2-calculator", "name": "Log Base 2 Calculator", "category": "math", "subcategory": "Logarithms", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate binary logarithms and detect exact powers of two."}, {"slug": "midpoint-calculator", "name": "Midpoint Calculator", "category": "math", "subcategory": "Geometry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Find the midpoint, distance, slope, and angle between two points."}, {"slug": "momentum-calculator", "name": "Momentum Calculator", "category": "science", "subcategory": "Physics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate linear momentum and kinetic energy from mass and velocity."}, {"slug": "mixed-number-to-fraction-converter", "name": "Mixed Number to Fraction Converter", "category": "math", "subcategory": "Fractions", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert a mixed number to an improper fraction and simplified form."}, {"slug": "morse-code-generator", "name": "Morse Code Generator", "category": "text", "subcategory": "Encoding", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert text to International Morse code with character breakdown."}, {"slug": "ohm-s-law-calculator", "name": "Ohm's Law Calculator", "category": "science", "subcategory": "Electronics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate voltage, current, resistance, and power from any two known values."}, {"slug": "outlier-calculator", "name": "Outlier Calculator", "category": "math", "subcategory": "Statistics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Detect IQR outliers and return quartiles, bounds, and counts."}, {"slug": "pangram-checker", "name": "Pangram Checker", "category": "text", "subcategory": "Analysis", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Check whether text contains every letter A through Z."}, {"slug": "list-difference-calculator", "name": "List Difference Calculator", "category": "text", "subcategory": "Lists", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Compare two line-based lists and return differences, intersection, and union."}, {"slug": "sample-mean-calculator", "name": "Sample Mean Calculator", "category": "math", "subcategory": "Statistics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate sample mean plus core descriptive statistics for a numeric dataset."}, {"slug": "percent-growth-rate-calculator", "name": "Percent Growth Rate Calculator", "category": "math", "subcategory": "Percentages", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate total percent change, simple annual growth, CAGR, and multiplier."}, {"slug": "perfect-number-checker", "name": "Perfect Number Checker", "category": "math", "subcategory": "Number Theory", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Classify a positive integer as perfect, abundant, or deficient."}, {"slug": "permutation-calculator", "name": "Permutation Calculator", "category": "math", "subcategory": "Combinatorics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate P(n,r), where order matters and repetition is not allowed."}, {"slug": "permutations-with-repetition-calculator", "name": "Permutations with Repetition Calculator", "category": "math", "subcategory": "Combinatorics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate n^r ordered arrangements where items can repeat."}, {"slug": "probability-calculator", "name": "Probability Calculator", "category": "math", "subcategory": "Probability", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Compute basic, conditional, Bayes, and complement probabilities."}, {"slug": "proportion-calculator", "name": "Proportion Calculator", "category": "math", "subcategory": "Ratios", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Solve or verify a proportion a/b = c/d from three or four values."}, {"slug": "reduce-fractions-calculator", "name": "Reduce Fractions Calculator", "category": "math", "subcategory": "Fractions", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Reduce a proper, improper, or mixed fraction to lowest terms."}, {"slug": "relative-standard-deviation-calculator", "name": "Relative Standard Deviation Calculator", "category": "math", "subcategory": "Statistics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate RSD, coefficient of variation, and precision quality for data."}, {"slug": "standard-error-calculator", "name": "Standard Error Calculator", "category": "math", "subcategory": "Statistics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate standard error of the mean and a z-based confidence interval."}, {"slug": "mean-absolute-deviation-calculator", "name": "Mean Absolute Deviation Calculator", "category": "math", "subcategory": "Statistics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate mean or median absolute deviation for a numeric dataset."}, {"slug": "median-absolute-deviation-calculator", "name": "Median Absolute Deviation Calculator", "category": "math", "subcategory": "Statistics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate raw and scaled median absolute deviation as a robust spread measure."}, {"slug": "parallel-resistor-calculator", "name": "Parallel Resistor Calculator", "category": "science", "subcategory": "Electrical", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate equivalent resistance and current sharing for resistors in parallel."}, {"slug": "point-slope-form-calculator", "name": "Point Slope Form Calculator", "category": "math", "subcategory": "Algebra", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Build point-slope, slope-intercept, and standard-form line equations."}, {"slug": "point-to-plane-distance-calculator", "name": "Point to Plane Distance Calculator", "category": "math", "subcategory": "Geometry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate the distance from a 3D point to a plane Ax + By + Cz + D = 0."}, {"slug": "polar-to-cartesian-converter", "name": "Polar to Cartesian Converter", "category": "math", "subcategory": "Coordinate Geometry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert polar coordinates to Cartesian x and y coordinates."}, {"slug": "polygon-diagonals-calculator", "name": "Polygon Diagonals Calculator", "category": "math", "subcategory": "Geometry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate the number of diagonals and angle facts for a polygon."}, {"slug": "power-factor-calculator", "name": "Power Factor Calculator", "category": "science", "subcategory": "Electrical", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate power factor, reactive power, or capacitor correction values."}, {"slug": "quartile-deviation-calculator", "name": "Quartile Deviation Calculator", "category": "math", "subcategory": "Statistics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate quartile deviation, IQR fences, and outliers for numeric data."}, {"slug": "rc-time-constant-calculator", "name": "RC Time Constant Calculator", "category": "science", "subcategory": "Electrical", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate RC circuit time constant, cutoff frequency, and charging or discharging levels."}, {"slug": "bowling-score-calculator", "name": "Bowling Score Calculator", "category": "math", "subcategory": "Sports", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Score a ten-pin bowling game from roll values."}, {"slug": "box-and-whisker-plot-maker", "name": "Box and Whisker Plot Maker", "category": "math", "subcategory": "Statistics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Compute box plot statistics, whiskers, fences, and outliers."}, {"slug": "buzzword-bingo-generator", "name": "Buzzword Bingo Generator", "category": "text", "subcategory": "Generators", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Generate a deterministic buzzword bingo board from a term list and seed."}, {"slug": "chi-square-test-calculator", "name": "Chi Square Test Calculator", "category": "math", "subcategory": "Statistics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Run a chi-square goodness-of-fit test for observed and expected counts."}, {"slug": "christmas-tree-calculator", "name": "Christmas Tree Calculator", "category": "math", "subcategory": "Lifestyle", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Check tree height fit and estimate lights, ornaments, and garland."}, {"slug": "commute-life-wasted-calculator", "name": "Commute Life Wasted Calculator", "category": "math", "subcategory": "Time", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimate weekly, yearly, and career time spent commuting."}, {"slug": "cron-job-generator", "name": "Cron Job Generator", "category": "dev", "subcategory": "Scheduling", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Generate a cron expression from common schedule presets."}, {"slug": "crontab-expression-generator", "name": "Crontab Expression Generator", "category": "dev", "subcategory": "Scheduling", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Build and validate a crontab expression from individual fields."}, {"slug": "curvature-calculator", "name": "Curvature Calculator", "category": "math", "subcategory": "Calculus", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate curvature and radius of curvature for a quadratic function."}, {"slug": "debt-consolidation-calculator", "name": "Debt Consolidation Calculator", "category": "finance", "subcategory": "Debt", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimate a consolidated debt payment and interest cost."}, {"slug": "aquarium-heater-wattage-calculator", "name": "Aquarium Heater Wattage Calculator", "category": "lifestyle", "subcategory": "Pets", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimate aquarium heater wattage from tank size and temperature gap."}, {"slug": "beading-pattern-calculator", "name": "Beading Pattern Calculator", "category": "lifestyle", "subcategory": "Crafts", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate beads needed from strand length and a repeating bead pattern."}, {"slug": "bird-cage-size-calculator", "name": "Bird Cage Size Calculator", "category": "lifestyle", "subcategory": "Pets", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Recommend minimum bird cage dimensions and bar spacing by species."}, {"slug": "bond-yield-to-maturity-calculator", "name": "Bond Yield to Maturity Calculator", "category": "finance", "subcategory": "Bonds", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Calculate bond yield to maturity with current yield and return metrics."}, {"slug": "boxing-punch-power-calculator", "name": "Boxing Punch Power Calculator", "category": "math", "subcategory": "Physics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimate punch force, kinetic energy, and power from speed and effective mass."}, {"slug": "cat-litter-box-calculator", "name": "Cat Litter Box Calculator", "category": "lifestyle", "subcategory": "Pets", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimate recommended cat litter boxes, placement, and monthly litter use."}, {"slug": "cat-years-calculator", "name": "Cat Years Calculator", "category": "lifestyle", "subcategory": "Pets", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert cat age into human-equivalent years and life stage."}, {"slug": "dog-years-calculator", "name": "Dog Years Calculator", "category": "lifestyle", "subcategory": "Pets", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert dog age to human-equivalent years by breed size."}, {"slug": "halfway-date-calculator", "name": "Halfway Date Calculator", "category": "time", "subcategory": "Dates", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Find the midpoint and quarter points between two dates."}, {"slug": "headlight-beam-distance-calculator", "name": "Headlight Beam Distance Calculator", "category": "math", "subcategory": "Physics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate headlight beam road reach from mounting height and aim angle."}, {"slug": "right-triangle-calculator", "name": "Right Triangle Calculator", "category": "math", "subcategory": "Geometry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Solve a right triangle from two sides or one side and one acute angle."}, {"slug": "pascal-s-triangle-generator", "name": "Pascal's Triangle Generator", "category": "math", "subcategory": "Sequences", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Generate Pascal's triangle rows and related row sums."}, {"slug": "matrix-trace-calculator", "name": "Matrix Trace Calculator", "category": "math", "subcategory": "Linear Algebra", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate the trace and diagonal details of a square matrix."}, {"slug": "quadratic-formula-calculator", "name": "Quadratic Formula Calculator", "category": "math", "subcategory": "Algebra", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Solve quadratic roots with discriminant and vertex details."}, {"slug": "gamma-function-calculator", "name": "Gamma Function Calculator", "category": "math", "subcategory": "Advanced Math", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Evaluate the gamma function for bounded real inputs."}, {"slug": "gini-coefficient-calculator", "name": "Gini Coefficient Calculator", "category": "math", "subcategory": "Statistics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate a Gini coefficient and Lorenz curve points from nonnegative data."}, {"slug": "geometric-distribution-calculator", "name": "Geometric Distribution Calculator", "category": "math", "subcategory": "Probability", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Compute PMF, CDF, survival, mean, and variance for a geometric distribution."}, {"slug": "number-to-word-converter", "name": "Number to Word Converter", "category": "text", "subcategory": "Conversion", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert a decimal number to English cardinal, ordinal, or currency words."}, {"slug": "parking-ratio-calculator", "name": "Parking Ratio Calculator", "category": "math", "subcategory": "Planning", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimate parking spaces from common land-use parking ratios."}, {"slug": "standard-form-to-slope-intercept-converter", "name": "Standard Form to Slope Intercept Converter", "category": "math", "subcategory": "Algebra", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert Ax + By = C into slope-intercept form when possible."}, {"slug": "belt-length-calculator", "name": "Belt Length Calculator", "category": "science", "subcategory": "Mechanics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate open or crossed belt length, wrap angles, and optional belt speed."}, {"slug": "bernoulli-equation-calculator", "name": "Bernoulli Equation Calculator", "category": "science", "subcategory": "Fluid Mechanics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Solve one Bernoulli streamline pressure, velocity, or height term."}, {"slug": "climbing-grade-converter", "name": "Climbing Grade Converter", "category": "sports", "subcategory": "Climbing", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert roped and bouldering climbing grades across common systems."}, {"slug": "clothing-size-converter", "name": "Clothing Size Converter", "category": "lifestyle", "subcategory": "Size Conversion", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert clothing sizes between alpha, US, UK, EU, JP, KR, and measurements."}, {"slug": "dijkstra-s-shortest-path-calculator", "name": "Dijkstra's Shortest Path Calculator", "category": "math", "subcategory": "Graph Theory", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Run Dijkstra's algorithm on a small weighted graph."}, {"slug": "dishwasher-load-optimizer", "name": "Dishwasher Load Optimizer", "category": "lifestyle", "subcategory": "Home", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimate dishwasher rack utilization, cycles needed, and item placement."}, {"slug": "error-function-calculator", "name": "Error Function Calculator", "category": "math", "subcategory": "Advanced Math", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Evaluate erf, erfc, inverse erf, and inverse erfc for bounded inputs."}, {"slug": "falling-through-earth-calculator", "name": "Falling Through Earth Calculator", "category": "science", "subcategory": "Physics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate idealized uniform-density gravity-train travel time and speed."}, {"slug": "gear-ratio-calculator-mechanical", "name": "Gear Ratio Calculator (Mechanical)", "category": "science", "subcategory": "Mechanics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate gear ratio, output RPM, torque, and mechanical advantage."}, {"slug": "game-sensitivity-converter", "name": "Game Sensitivity Converter", "category": "gaming", "subcategory": "Mouse Sensitivity", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert FPS mouse sensitivity using cm per 360 degrees."}, {"slug": "lipogram-checker", "name": "Lipogram Checker", "category": "text", "subcategory": "Analysis", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Check whether text avoids one or more forbidden letters."}, {"slug": "long-division-calculator", "name": "Long Division Calculator", "category": "math", "subcategory": "Basic Math", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate quotient, remainder, decimal expansion, and long division steps."}, {"slug": "long-multiplication-calculator", "name": "Long Multiplication Calculator", "category": "math", "subcategory": "Basic Math", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate a product with long multiplication partial products."}, {"slug": "number-to-fraction-converter", "name": "Number to Fraction Converter", "category": "math", "subcategory": "Fractions", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert decimals, percentages, mixed numbers, and repeating decimals to fractions."}, {"slug": "poisson-distribution-calculator", "name": "Poisson Distribution Calculator", "category": "math", "subcategory": "Probability", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate Poisson PMF, CDF, and tail probabilities."}, {"slug": "significant-figures-calculator", "name": "Significant Figures Calculator", "category": "math", "subcategory": "Number Formatting", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Count, round, and apply arithmetic rules for significant figures."}, {"slug": "sort-text-by-length", "name": "Sort Text By Length", "category": "text", "subcategory": "Sorting", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Sort text lines by character length with basic line statistics."}, {"slug": "string-repeat", "name": "String Repeat", "category": "text", "subcategory": "Modification", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Repeat a string with separators, optional prefixes, suffixes, and numbering."}, {"slug": "square-numbers-list", "name": "Square Numbers List", "category": "math", "subcategory": "Sequences", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "List square numbers, find squares in a range, or check a perfect square."}, {"slug": "resistor-color-code-calculator", "name": "Resistor Color Code Calculator", "category": "science", "subcategory": "Electronics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate 4-band, 5-band, and 6-band resistor values from color bands."}, {"slug": "reverse-lines", "name": "Reverse Lines", "category": "text", "subcategory": "Modification", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Reverse the order of lines in a text block."}, {"slug": "skip-counting-generator", "name": "Skip Counting Generator", "category": "math", "subcategory": "Sequences", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Generate an arithmetic skip-counting sequence."}, {"slug": "twin-prime-finder", "name": "Twin Prime Finder", "category": "math", "subcategory": "Number Theory", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Find twin prime pairs up to a bounded integer limit."}, {"slug": "shoelace-formula-calculator", "name": "Shoelace Formula Calculator", "category": "math", "subcategory": "Geometry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate polygon area from vertex coordinates using the shoelace formula."}, {"slug": "triangle-centroid-calculator", "name": "Triangle Centroid Calculator", "category": "math", "subcategory": "Geometry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate a triangle centroid and related side, area, and median properties."}, {"slug": "squareness-checker", "name": "Squareness Checker", "category": "construction", "subcategory": "Layout", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Check a corner against the Pythagorean 3-4-5 squareness rule."}, {"slug": "set-theory-calculator", "name": "Set Theory Calculator", "category": "math", "subcategory": "Set Theory", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Perform common finite set operations."}, {"slug": "truth-table-generator", "name": "Truth Table Generator", "category": "math", "subcategory": "Logic", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Generate truth tables for small boolean logic expressions."}, {"slug": "synthetic-division-calculator", "name": "Synthetic Division Calculator", "category": "math", "subcategory": "Algebra", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Divide polynomial coefficients by x minus a using synthetic division."}, {"slug": "thermal-expansion-calculator", "name": "Thermal Expansion Calculator", "category": "science", "subcategory": "Physics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate linear, area, or volume thermal expansion for common materials."}, {"slug": "arcsin-calculator", "name": "Arcsin Calculator", "category": "math", "subcategory": "Trigonometry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate arcsine from a sine value, including degree/radian output and special-angle recognition."}, {"slug": "arctan2-calculator", "name": "Arctan2 Calculator", "category": "math", "subcategory": "Trigonometry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate atan2(y, x), normalized angle, radius, slope, and quadrant."}, {"slug": "arithmetic-mean-calculator", "name": "Arithmetic Mean Calculator", "category": "math", "subcategory": "Statistics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate arithmetic mean, median, modes, range, variance, and standard deviation from a number list."}, {"slug": "geometric-mean-calculator", "name": "Geometric Mean Calculator", "category": "math", "subcategory": "Statistics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate geometric mean and compare it with arithmetic, harmonic, median, minimum, and maximum values."}, {"slug": "harmonic-mean-calculator", "name": "Harmonic Mean Calculator", "category": "math", "subcategory": "Statistics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate harmonic mean for positive non-zero values with comparison means and reciprocal totals."}, {"slug": "fraction-simplifier", "name": "Fraction Simplifier", "category": "math", "subcategory": "Fractions", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Reduce a fraction to lowest terms and return GCF, mixed number, decimal, percentage, and equivalents."}, {"slug": "fraction-to-decimal-calculator", "name": "Fraction to Decimal Calculator", "category": "math", "subcategory": "Fractions", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert proper, improper, or mixed fractions to decimals and detect repeating decimal patterns."}, {"slug": "fraction-to-percent-converter", "name": "Fraction to Percent Converter", "category": "math", "subcategory": "Fractions", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert proper, improper, or mixed fractions to percentages with configurable decimal places."}, {"slug": "equivalent-fractions-calculator", "name": "Equivalent Fractions Calculator", "category": "math", "subcategory": "Fractions", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Generate equivalent fractions or check whether two fractions are equivalent."}, {"slug": "feet-and-inches-to-cm-converter", "name": "Feet and Inches to Cm Converter", "category": "math", "subcategory": "Length", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert feet and inches to total inches, centimeters, meters, and height comparison percentages."}, {"slug": "countdown-timer", "name": "Countdown Timer", "category": "time", "subcategory": "Countdown", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate an exact countdown between two ISO datetimes."}, {"slug": "destiny-number-calculator", "name": "Destiny Number Calculator", "category": "math", "subcategory": "Numerology", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate a Pythagorean numerology destiny number from a name."}, {"slug": "fraction-calculator", "name": "Fraction Calculator", "category": "math", "subcategory": "Fractions", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Add, subtract, multiply, divide, compare, or simplify fractions."}, {"slug": "function-composition-calculator", "name": "Function Composition Calculator", "category": "math", "subcategory": "Functions", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Evaluate f(x), g(x), f(g(x)), and g(f(x)) for arithmetic functions."}, {"slug": "function-odd-even-neither-checker", "name": "Function Odd Even Neither Checker", "category": "math", "subcategory": "Functions", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Classify a function as odd, even, both, or neither over sample points."}, {"slug": "gacha-pity-calculator", "name": "Gacha Pity Calculator", "category": "math", "subcategory": "Probability", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimate pull success probability with soft and hard pity rates."}, {"slug": "gpa-calculator", "name": "GPA Calculator", "category": "education", "subcategory": "Grades", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate term and cumulative GPA from letter grades and credits."}, {"slug": "graph-degree-sequence-validator", "name": "Graph Degree Sequence Validator", "category": "math", "subcategory": "Graph Theory", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Validate simple graph degree sequences with the Havel-Hakimi algorithm."}, {"slug": "histogram-maker", "name": "Histogram Maker", "category": "math", "subcategory": "Statistics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Create histogram bin counts and relative frequencies from numeric data."}, {"slug": "hypergeometric-distribution-calculator", "name": "Hypergeometric Distribution Calculator", "category": "math", "subcategory": "Probability", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate exact and cumulative hypergeometric probabilities."}, {"slug": "html-compressor", "name": "HTML Compressor", "category": "webmaster", "subcategory": "HTML", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Compress HTML by removing comments and extra whitespace."}, {"slug": "html-entity-encoder-decoder", "name": "HTML Entity Encoder Decoder", "category": "webmaster", "subcategory": "HTML", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Encode or decode HTML entities for text and markup snippets."}, {"slug": "hex-converter", "name": "Hex Converter", "category": "math", "subcategory": "Number Systems", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert integers between hexadecimal, decimal, binary, and octal."}, {"slug": "ip-address-to-hex-converter", "name": "IP Address to Hex Converter", "category": "network", "subcategory": "IP", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert IPv4 or IPv6 addresses to integer, hex, and binary formats."}, {"slug": "ip-subnet-calculator", "name": "IP Subnet Calculator", "category": "network", "subcategory": "IP", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate CIDR subnet address ranges, masks, and host counts."}, {"slug": "is-it-leap-year", "name": "Is It Leap Year", "category": "time", "subcategory": "Calendar", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Check whether a Gregorian calendar year is a leap year."}, {"slug": "hours-calculator", "name": "Hours Calculator", "category": "time", "subcategory": "Duration", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate gross and net hours between two times, including breaks."}, {"slug": "list-cleaner", "name": "List Cleaner", "category": "text", "subcategory": "Cleanup", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Trim, deduplicate, remove blanks, and optionally sort list lines."}, {"slug": "mac-address-analyzer", "name": "MAC Address Analyzer", "category": "network", "subcategory": "MAC", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Normalize and inspect MAC address type and administration bits."}, {"slug": "loot-drop-probability-calculator", "name": "Loot Drop Probability Calculator", "category": "math", "subcategory": "Probability", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate loot drop odds across repeated independent attempts."}, {"slug": "inclusion-exclusion-calculator", "name": "Inclusion Exclusion Calculator", "category": "math", "subcategory": "Set Theory", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Apply inclusion-exclusion for one, two, or three finite sets."}, {"slug": "length-converter", "name": "Length Converter", "category": "math", "subcategory": "Unit Conversion", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert a length value across metric, imperial, and nautical units."}, {"slug": "linear-equation-solver", "name": "Linear Equation Solver", "category": "math", "subcategory": "Algebra", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Solve a linear equation in the form ax + b = c."}, {"slug": "logarithmic-growth-calculator", "name": "Logarithmic Growth Calculator", "category": "math", "subcategory": "Growth", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Solve compound growth value, time-to-target, or rate using logarithms."}, {"slug": "long-addition-and-subtraction-calculator", "name": "Long Addition and Subtraction Calculator", "category": "math", "subcategory": "Arithmetic", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Add or subtract large integers and return aligned column output."}, {"slug": "mean-median-mode-calculator", "name": "Mean Median Mode Calculator", "category": "math", "subcategory": "Statistics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate mean, median, mode, range, variance, and standard deviation."}, {"slug": "mersenne-prime-checker", "name": "Mersenne Prime Checker", "category": "math", "subcategory": "Number Theory", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Check whether 2^p - 1 is prime for bounded exponents."}, {"slug": "multiple-fraction-calculator", "name": "Multiple Fraction Calculator", "category": "math", "subcategory": "Fractions", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Apply one arithmetic operation across a list of fractions."}, {"slug": "octal-converter", "name": "Octal Converter", "category": "math", "subcategory": "Number Systems", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert non-negative integers between octal, decimal, binary, and hex."}, {"slug": "order-of-operations-calculator-pemdas", "name": "Order of Operations Calculator PEMDAS", "category": "math", "subcategory": "Arithmetic", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Evaluate arithmetic expressions using standard PEMDAS precedence."}, {"slug": "overtime-pay-calculator", "name": "Overtime Pay Calculator", "category": "math", "subcategory": "Payroll", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate regular pay, overtime pay, gross pay, and effective hourly rate."}, {"slug": "parabola-calculator", "name": "Parabola Calculator", "category": "math", "subcategory": "Algebra", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Analyze a quadratic parabola from coefficients a, b, and c."}, {"slug": "parallel-and-perpendicular-line-calculator", "name": "Parallel and Perpendicular Line Calculator", "category": "math", "subcategory": "Analytic Geometry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Find parallel and perpendicular lines through a given point."}, {"slug": "partial-derivative-calculator", "name": "Partial Derivative Calculator", "category": "math", "subcategory": "Calculus", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Differentiate a symbolic expression with respect to x, y, z, or t."}, {"slug": "partial-fraction-decomposition-calculator", "name": "Partial Fraction Decomposition Calculator", "category": "math", "subcategory": "Algebra", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Decompose a rational expression into partial fractions."}, {"slug": "partition-function-calculator", "name": "Partition Function Calculator", "category": "math", "subcategory": "Number Theory", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate the integer partition number p(n) for bounded n."}, {"slug": "paver-calculator", "name": "Paver Calculator", "category": "math", "subcategory": "Construction", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimate paving stones needed for a rectangular project area."}, {"slug": "payback-period-calculator", "name": "Payback Period Calculator", "category": "math", "subcategory": "Finance", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate the payback period from an initial investment and annual cash flows."}, {"slug": "pcb-trace-width-calculator", "name": "PCB Trace Width Calculator", "category": "math", "subcategory": "Electronics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimate PCB trace width using the IPC-2221 current capacity formula."}, {"slug": "penny-drop-impact-calculator", "name": "Penny Drop Impact Calculator", "category": "math", "subcategory": "Physics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimate idealized penny impact velocity, energy, momentum, and force."}, {"slug": "recurring-deposit-calculator", "name": "Recurring Deposit Calculator", "category": "finance", "subcategory": "Savings", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Project recurring monthly deposits with compound interest and chart-ready balance data."}, {"slug": "retirement-calculator", "name": "Retirement Calculator", "category": "finance", "subcategory": "Retirement", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimate retirement savings growth, inflation-adjusted value, and contribution breakdown."}, {"slug": "rule-of-72-calculator", "name": "Rule of 72 Calculator", "category": "finance", "subcategory": "Interest", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimate investment doubling time with the Rule of 72 and exact compound formula."}, {"slug": "sale-price-calculator", "name": "Sale Price Calculator", "category": "finance", "subcategory": "Discounts", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate discounted sale price, tax, final price, and chart-ready price breakdown."}, {"slug": "savings-calculator", "name": "Savings Calculator", "category": "finance", "subcategory": "Savings", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Project savings growth with recurring contributions and chart-ready balance data."}, {"slug": "speed-calculator", "name": "Speed Calculator", "category": "math", "subcategory": "Physics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate speed from distance and time with common speed unit conversions."}, {"slug": "sphere-calculator", "name": "Sphere Calculator", "category": "math", "subcategory": "Geometry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate sphere radius, diameter, circumference, surface area, and volume."}, {"slug": "stair-calculator", "name": "Stair Calculator", "category": "construction", "subcategory": "Layout", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimate stair risers, treads, run, stringer length, slope, and step profile data."}, {"slug": "tip-calculator", "name": "Tip Calculator", "category": "finance", "subcategory": "Bills", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate tip, tax, total bill, split amounts, and chart-ready bill breakdown."}, {"slug": "time-card-calculator", "name": "Time Card Calculator", "category": "finance", "subcategory": "Payroll", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate regular hours, overtime hours, gross pay, and daily hour chart data."}, {"slug": "roth-ira-calculator", "name": "Roth IRA Calculator", "category": "finance", "subcategory": "Retirement", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Project Roth IRA growth with contributions, earnings, and chart-ready year-by-year data."}, {"slug": "tax-calculator", "name": "Tax Calculator", "category": "finance", "subcategory": "Taxes", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimate taxable income, tax, take-home income, and effective rate from user-supplied flat rates."}, {"slug": "triangle-area-calculator", "name": "Triangle Area Calculator", "category": "math", "subcategory": "Geometry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate triangle area from base and height or Heron's formula."}, {"slug": "weighted-average-calculator", "name": "Weighted Average Calculator", "category": "math", "subcategory": "Statistics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate a weighted average from value and weight lists."}, {"slug": "unit-circle-calculator", "name": "Unit Circle Calculator", "category": "math", "subcategory": "Trigonometry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate unit-circle sine, cosine, tangent, radians, degrees, and point coordinates."}, {"slug": "sequence-calculator", "name": "Sequence Calculator", "category": "math", "subcategory": "Sequences", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Generate arithmetic, geometric, or Fibonacci-style sequence terms and sums."}, {"slug": "work-calculator", "name": "Work Calculator", "category": "science", "subcategory": "Physics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate mechanical work from force, distance, and angle."}, {"slug": "statistics-calculator", "name": "Statistics Calculator", "category": "math", "subcategory": "Statistics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate descriptive statistics and histogram-ready distribution data from numeric values."}, {"slug": "fuel-cost-calculator", "name": "Fuel Cost Calculator", "category": "finance", "subcategory": "Travel", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimate trip fuel usage, total fuel cost, and per-person cost."}, {"slug": "grade-calculator", "name": "Grade Calculator", "category": "education", "subcategory": "Grades", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate weighted grades and the score needed on remaining work."}, {"slug": "margin-calculator", "name": "Margin Calculator", "category": "finance", "subcategory": "Profitability", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate gross profit, margin percent, markup percent, and chart-ready revenue breakdown."}, {"slug": "percentage-change-calculator", "name": "Percentage Change Calculator", "category": "math", "subcategory": "Percentage", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate percentage change between two values with chart-ready before-and-after data."}, {"slug": "break-even-point-calculator", "name": "Break Even Point Calculator", "category": "finance", "subcategory": "Profitability", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate break-even units, revenue, costs, and rounded-unit profit."}, {"slug": "depreciation-calculator", "name": "Depreciation Calculator", "category": "finance", "subcategory": "Accounting", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Generate straight-line or declining-balance depreciation schedules with chart-ready book values."}, {"slug": "cylinder-calculator", "name": "Cylinder Calculator", "category": "math", "subcategory": "Geometry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate cylinder volume, base area, lateral area, and total surface area."}, {"slug": "loan-to-value-calculator", "name": "Loan to Value Calculator", "category": "finance", "subcategory": "Real Estate", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate loan-to-value percent, equity, and equity percent for a property."}, {"slug": "cap-rate-calculator", "name": "Cap Rate Calculator", "category": "finance", "subcategory": "Real Estate", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate net operating income, cap rate, expense ratio, and monthly NOI."}, {"slug": "present-value-calculator", "name": "Present Value Calculator", "category": "finance", "subcategory": "Time Value", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Discount a future value to present value with configurable compounding and chart-ready series."}, {"slug": "series-resistor-calculator", "name": "Series Resistor Calculator", "category": "science", "subcategory": "Electronics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate equivalent resistance for resistors in series."}, {"slug": "parallel-capacitor-calculator", "name": "Parallel Capacitor Calculator", "category": "science", "subcategory": "Electronics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate equivalent capacitance for capacitors in parallel."}, {"slug": "cash-flow-calculator", "name": "Cash Flow Calculator", "category": "finance", "subcategory": "Cash Flow", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate net cash flow, ending cash, and optional month-by-month cash balance."}, {"slug": "inventory-turnover-ratio-calculator", "name": "Inventory Turnover Ratio Calculator", "category": "finance", "subcategory": "Efficiency", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate inventory turnover ratio and days inventory outstanding."}, {"slug": "debt-service-coverage-ratio-calculator", "name": "Debt Service Coverage Ratio Calculator", "category": "finance", "subcategory": "Coverage", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate DSCR and cash flow after annual debt service."}, {"slug": "loan-to-cost-calculator", "name": "Loan to Cost Calculator", "category": "finance", "subcategory": "Real Estate", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate loan-to-cost percent and equity required for a project."}, {"slug": "rent-affordability-calculator", "name": "Rent Affordability Calculator", "category": "finance", "subcategory": "Housing", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimate affordable monthly rent from income, debt, utilities, and rent budget percent."}, {"slug": "body-surface-area-calculator", "name": "Body Surface Area Calculator", "category": "health", "subcategory": "Body Metrics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimate body surface area using Mosteller, Du Bois, or Haycock formulas."}, {"slug": "calorie-deficit-calculator", "name": "Calorie Deficit Calculator", "category": "health", "subcategory": "Nutrition", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimate daily calorie deficit, target intake, and projected weight-loss trend."}, {"slug": "water-intake-calculator", "name": "Water Intake Calculator", "category": "health", "subcategory": "Hydration", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimate daily water intake from body weight, activity, and hot-weather adjustment."}, {"slug": "heart-rate-zone-calculator", "name": "Heart Rate Zone Calculator", "category": "health", "subcategory": "Fitness", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimate heart-rate training zones using max-heart-rate or Karvonen formulas."}, {"slug": "protein-intake-calculator", "name": "Protein Intake Calculator", "category": "health", "subcategory": "Nutrition", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimate daily protein intake and per-meal targets from weight and training goal."}, {"slug": "conversion-rate-calculator", "name": "Conversion Rate Calculator", "category": "marketing", "subcategory": "Funnels", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate conversion rate from visitors and conversions."}, {"slug": "customer-acquisition-cost-calculator", "name": "Customer Acquisition Cost Calculator", "category": "marketing", "subcategory": "Unit Economics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate CAC from marketing spend, sales spend, and new customers."}, {"slug": "customer-lifetime-value-calculator", "name": "Customer Lifetime Value Calculator", "category": "marketing", "subcategory": "Unit Economics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimate LTV from order value, purchase frequency, gross margin, and lifespan."}, {"slug": "churn-rate-calculator", "name": "Churn Rate Calculator", "category": "marketing", "subcategory": "Retention", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate churn, retention, ending customers, and net customer growth."}, {"slug": "net-promoter-score-calculator", "name": "Net Promoter Score Calculator", "category": "marketing", "subcategory": "Surveys", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate NPS from promoter, passive, and detractor counts."}, {"slug": "arpu-calculator", "name": "ARPU Calculator", "category": "marketing", "subcategory": "SaaS Metrics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate ARPU for a period plus monthly and annualized ARPU."}, {"slug": "burn-rate-calculator", "name": "Burn Rate Calculator", "category": "finance", "subcategory": "Startup", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate gross burn, net burn, and estimated runway from cash flow."}, {"slug": "runway-calculator", "name": "Runway Calculator", "category": "finance", "subcategory": "Startup", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate cash runway in months and chart the cash balance decline."}, {"slug": "email-open-rate-calculator", "name": "Email Open Rate Calculator", "category": "marketing", "subcategory": "Email", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate email delivery rate and open rate from campaign counts."}, {"slug": "unsubscribe-rate-calculator", "name": "Unsubscribe Rate Calculator", "category": "marketing", "subcategory": "Email", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate campaign unsubscribe rate and subscriber-list loss rate."}, {"slug": "recipe-scaler", "name": "Recipe Scaler", "category": "cooking", "subcategory": "Recipes", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Scale ingredient quantities from one serving count to another."}, {"slug": "revenue-per-employee-calculator", "name": "Revenue Per Employee Calculator", "category": "business", "subcategory": "Productivity", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate revenue per employee for a period and annualized basis."}, {"slug": "reverse-line", "name": "Reverse Line", "category": "text", "subcategory": "Lines", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Reverse the characters in each line of text."}, {"slug": "roof-pitch-calculator", "name": "Roof Pitch Calculator", "category": "construction", "subcategory": "Roofing", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate roof pitch, angle, slope percent, and rafter multiplier."}, {"slug": "running-pace-calculator", "name": "Running Pace Calculator", "category": "fitness", "subcategory": "Pace", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate running pace per kilometer and mile plus speed."}, {"slug": "scale-model-conversion-calculator", "name": "Scale Model Conversion Calculator", "category": "conversion", "subcategory": "Scale", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert a length from one model scale to another."}, {"slug": "shower-cost-calculator", "name": "Shower Cost Calculator", "category": "home", "subcategory": "Utilities", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimate water use, energy use, and cost for showers."}, {"slug": "social-media-roi-calculator", "name": "Social Media ROI Calculator", "category": "marketing", "subcategory": "ROI", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate social media campaign ROI, ROAS, conversion rate, and unit costs."}, {"slug": "sourdough-calculator", "name": "Sourdough Calculator", "category": "cooking", "subcategory": "Baking", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate sourdough flour, water, starter, salt, and dough weight."}, {"slug": "spaghetti-portion-calculator", "name": "Spaghetti Portion Calculator", "category": "cooking", "subcategory": "Portions", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate dry and cooked spaghetti portions for a serving count."}, {"slug": "square-calculator", "name": "Square Calculator", "category": "math", "subcategory": "Geometry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate square side length, area, perimeter, diagonal, inradius, and circumradius from one known value."}, {"slug": "rectangle-calculator", "name": "Rectangle Calculator", "category": "math", "subcategory": "Geometry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate rectangle area, perimeter, diagonal, radii, and aspect ratio from two known values."}, {"slug": "volume-of-a-cube-calculator", "name": "Volume of a Cube Calculator", "category": "math", "subcategory": "Volume", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate cube volume, surface area, face area, diagonals, and total edge length."}, {"slug": "volume-of-a-cone-calculator", "name": "Volume of a Cone Calculator", "category": "math", "subcategory": "Volume", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate cone volume, slant height, base area, lateral area, and total surface area."}, {"slug": "volume-of-a-pyramid-calculator", "name": "Volume of a Pyramid Calculator", "category": "math", "subcategory": "Volume", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate volume, base area, slant height, and surface area for square, rectangular, or triangular pyramids."}, {"slug": "volume-of-a-rectangular-prism-calculator", "name": "Volume of a Rectangular Prism Calculator", "category": "math", "subcategory": "Volume", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate rectangular prism volume, surface area, diagonals, base perimeter, and total edge length."}, {"slug": "volume-of-ellipsoid-calculator", "name": "Volume of Ellipsoid Calculator", "category": "math", "subcategory": "Volume", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate ellipsoid volume, approximate surface area, cross sections, equivalent sphere radius, and shape type."}, {"slug": "surface-area-of-a-cube-calculator", "name": "Surface Area of a Cube Calculator", "category": "math", "subcategory": "Surface Area", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate cube surface area and related measurements from edge, diagonal, volume, or surface area."}, {"slug": "surface-area-of-a-cone-calculator", "name": "Surface Area of a Cone Calculator", "category": "math", "subcategory": "Surface Area", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate cone base, lateral, and total surface area from radius-height, radius-slant, or diameter-height inputs."}, {"slug": "regular-polygon-calculator", "name": "Regular Polygon Calculator", "category": "math", "subcategory": "Geometry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate regular polygon area, perimeter, apothem, circumradius, angles, and diagonal count."}, {"slug": "attendance-percentage-calculator", "name": "Attendance Percentage Calculator", "category": "education", "subcategory": "Attendance", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate attendance percentage, classes needed for a target, and safe skips."}, {"slug": "beer-lambert-law-calculator", "name": "Beer-Lambert Law Calculator", "category": "science", "subcategory": "Chemistry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Solve A = epsilon l c for absorbance, molar absorptivity, concentration, or path length."}, {"slug": "boiling-point-elevation-calculator", "name": "Boiling Point Elevation Calculator", "category": "science", "subcategory": "Chemistry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate boiling point elevation from molality, Kb, and van't Hoff factor."}, {"slug": "cgpa-to-percentage-converter", "name": "CGPA to Percentage Converter", "category": "education", "subcategory": "Grades", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert CGPA to percentage using common 10-, 5-, and 4-point formulas."}, {"slug": "contribution-margin-calculator", "name": "Contribution Margin Calculator", "category": "business", "subcategory": "Profitability", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate unit and total contribution margin, ratio, profit, and break-even units."}, {"slug": "cost-per-lead-calculator", "name": "Cost Per Lead Calculator", "category": "marketing", "subcategory": "Unit Costs", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate cost per lead and optional funnel metrics."}, {"slug": "date-to-roman-numerals-converter", "name": "Date to Roman Numerals Converter", "category": "time", "subcategory": "Date Format", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert a calendar date into Roman numeral date formats."}, {"slug": "fermentation-time-calculator", "name": "Fermentation Time Calculator", "category": "cooking", "subcategory": "Fermentation", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimate fermentation time using a Q10 temperature adjustment model."}, {"slug": "gas-vs-electric-cost-comparison", "name": "Gas vs Electric Cost Comparison", "category": "home", "subcategory": "Utilities", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Compare gas and electric annual running costs and CO2 estimates."}, {"slug": "heat-transfer-calculator", "name": "Heat Transfer Calculator", "category": "science", "subcategory": "Physics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate heat transfer by conduction, convection, or radiation."}, {"slug": "buoyancy-calculator", "name": "Buoyancy Calculator", "category": "science", "subcategory": "Physics Calculators", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate buoyant force, object density, apparent weight, and float/sink verdict."}, {"slug": "de-broglie-wavelength-calculator", "name": "de Broglie Wavelength Calculator", "category": "science", "subcategory": "Physics Calculators", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate a particle's de Broglie wavelength from velocity or kinetic energy."}, {"slug": "e-mc-calculator", "name": "E=mc\u00b2 Calculator", "category": "science", "subcategory": "Physics Calculators", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert mass and energy using E=mc\u00b2 with configurable conversion efficiency."}, {"slug": "escape-velocity-calculator", "name": "Escape Velocity Calculator", "category": "science", "subcategory": "Physics Calculators", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate escape velocity for preset or custom celestial bodies."}, {"slug": "gravitational-force-calculator", "name": "Gravitational Force Calculator", "category": "science", "subcategory": "Physics Calculators", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Solve Newton's universal gravitation equation for force, mass, or distance."}, {"slug": "hydraulic-cylinder-force-calculator", "name": "Hydraulic Cylinder Force Calculator", "category": "engineering", "subcategory": "Physics Calculators", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate hydraulic cylinder extend and retract force from pressure and diameters."}, {"slug": "impedance-calculator", "name": "Impedance Calculator", "category": "engineering", "subcategory": "Electronics Tools", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate series or parallel RLC impedance, phase, resonance, and power factor."}, {"slug": "kepler-s-third-law-calculator", "name": "Kepler's Third Law Calculator", "category": "science", "subcategory": "Physics Calculators", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate orbital period and mean velocity from semi-major axis and central mass."}, {"slug": "photon-energy-calculator", "name": "Photon Energy Calculator", "category": "science", "subcategory": "Physics Calculators", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert photon wavelength, frequency, and energy using E=hf=hc/lambda."}, {"slug": "pka-to-ka-converter", "name": "pKa to Ka Converter", "category": "science", "subcategory": "Chemical Calculators", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert between pKa, Ka, pKb, and Kb for an acid-base conjugate pair."}, {"slug": "learning-curve-calculator", "name": "Learning Curve Calculator", "category": "education", "subcategory": "Student Calculators", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Project time per repetition, cumulative practice time, and target repetitions with a power-law learning curve."}, {"slug": "lemonade-stand-calculator", "name": "Lemonade Stand Calculator", "category": "business", "subcategory": "Small Business Calculators", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate batch cost, cup cost, break-even cups, and daily lemonade stand profit."}, {"slug": "light-bulb-savings-calculator", "name": "Light Bulb Savings Calculator", "category": "home", "subcategory": "Energy Calculators", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Compare bulb energy, replacement cost, total savings, and payback period."}, {"slug": "lumber-calculator", "name": "Lumber Calculator", "category": "construction", "subcategory": "Construction And DIY Calculators", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate board feet, coverage, waste, linear feet, and lumber cost."}, {"slug": "knitting-needle-size-converter", "name": "Knitting Needle Size Converter", "category": "craft", "subcategory": "Craft Tools", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert knitting needle sizes among metric, US, UK/Canada, and Japanese systems."}, {"slug": "keyboard-mileage-calculator", "name": "Keyboard Mileage Calculator", "category": "productivity", "subcategory": "Fun Calculators", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimate finger travel distance from typing speed and time spent typing."}, {"slug": "plant-spacing-calculator", "name": "Plant Spacing Calculator", "category": "home", "subcategory": "Garden Calculators", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimate plant counts for square and triangular garden spacing layouts."}, {"slug": "print-cost-calculator", "name": "Print Cost Calculator", "category": "business", "subcategory": "Cost Calculators", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate ink, toner, paper, print job, monthly, and yearly printing costs."}, {"slug": "pizza-value-calculator", "name": "Pizza Value Calculator", "category": "finance", "subcategory": "Everyday Calculators", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Compare two pizzas by area, price per area, slice value, and savings percentage."}, {"slug": "pottery-clay-shrinkage-calculator", "name": "Pottery Clay Shrinkage Calculator", "category": "craft", "subcategory": "Craft Tools", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate fired clay dimensions, reverse wet sizing, or measured shrinkage rate."}, {"slug": "quilt-binding-calculator", "name": "Quilt Binding Calculator", "category": "craft", "subcategory": "Craft Tools", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate quilt binding length, strip count, finished width, and fabric yardage."}, {"slug": "origami-paper-size-calculator", "name": "Origami Paper Size Calculator", "category": "craft", "subcategory": "Craft Tools", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate paper square size from target origami model size and model ratio."}, {"slug": "percentage-to-cgpa-converter", "name": "Percentage to CGPA Converter", "category": "education", "subcategory": "Student Calculators", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert percentage to CGPA across common 10-point, 5-point, and 4-point formulas."}, {"slug": "mole-gram-particle-converter", "name": "Mole/Gram/Particle Converter", "category": "science", "subcategory": "Chemical Calculators", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert among moles, grams, and particles using molar mass and Avogadro's constant."}, {"slug": "molality-calculator", "name": "Molality Calculator", "category": "science", "subcategory": "Chemical Calculators", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate molality and colligative freezing and boiling point shifts."}, {"slug": "osmotic-pressure-calculator", "name": "Osmotic Pressure Calculator", "category": "science", "subcategory": "Chemical Calculators", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate osmotic pressure from molarity, temperature, and van't Hoff factor."}, {"slug": "nernst-equation-calculator", "name": "Nernst Equation Calculator", "category": "science", "subcategory": "Chemical Calculators", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate electrochemical cell potential under non-standard conditions."}, {"slug": "dilution-calculator", "name": "Dilution Calculator", "category": "science", "subcategory": "Chemical Calculators", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Solve M1V1 = M2V2 for stock concentration, stock volume, final concentration, or final volume."}, {"slug": "ideal-gas-law-calculator", "name": "Ideal Gas Law Calculator", "category": "science", "subcategory": "Physics Calculators", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Solve PV=nRT for pressure, volume, moles, or temperature with unit conversion."}, {"slug": "molarity-calculator", "name": "Molarity Calculator", "category": "science", "subcategory": "Chemical Calculators", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate molarity, solute mass, or solution volume from mass, molar mass, and volume."}, {"slug": "surface-area-of-a-rectangular-prism-calculator", "name": "Surface Area of a Rectangular Prism Calculator", "category": "math", "subcategory": "Geometry Calculators", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate rectangular prism surface area, lateral area, volume, diagonal, and face areas."}, {"slug": "swimming-pace-calculator", "name": "Swimming Pace Calculator", "category": "fitness", "subcategory": "Sports Calculators", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate swim pace per 100m/100yd, speed, lap splits, race estimates, and pace zone."}, {"slug": "tangent-line-to-circle-calculator", "name": "Tangent Line to Circle Calculator", "category": "math", "subcategory": "Geometry Calculators", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Find tangent line equations and contact points from a point to a circle."}, {"slug": "triangle-orthocenter-calculator", "name": "Triangle Orthocenter Calculator", "category": "math", "subcategory": "Geometry Calculators", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate a triangle orthocenter, altitude feet, side lengths, area, and classifications from coordinates."}, {"slug": "vertex-axis-calculator", "name": "Vertex and Axis of Symmetry Calculator", "category": "math", "subcategory": "Algebra Calculators", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Find the vertex and axis of symmetry for a quadratic ax^2 + bx + c."}, {"slug": "vertical-jump-calculator", "name": "Vertical Jump Calculator", "category": "fitness", "subcategory": "Sports Calculators", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate vertical jump height, rating, percentile estimate, and optional power estimates."}, {"slug": "volume-converter", "name": "Volume Converter", "category": "conversion", "subcategory": "Unit Converters", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert volume among metric, US customary, cooking, and cubic units."}, {"slug": "weight-converter", "name": "Weight (Mass) Converter", "category": "conversion", "subcategory": "Unit Converters", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert mass among metric, imperial, ton, stone, and carat units."}, {"slug": "pizza-party-planner", "name": "Pizza Party Planner", "category": "food", "subcategory": "Planning Calculators", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimate pizzas, slices, vegetarian split, leftovers, and optional cost for a group."}, {"slug": "taco-bar-calculator", "name": "Taco Bar Calculator", "category": "food", "subcategory": "Planning Calculators", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimate taco bar shells, protein, toppings, sides, and extras for a group."}, {"slug": "on-base-percentage-calculator", "name": "On Base Percentage Calculator", "category": "sports", "subcategory": "Baseball", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate on-base percentage with batting average and optional OPS."}, {"slug": "operating-profit-percentage-calculator", "name": "Operating Profit Percentage Calculator", "category": "finance", "subcategory": "Profitability", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate operating profit percentage from operating income or a revenue cost breakdown."}, {"slug": "list-of-fibonacci-numbers", "name": "List of Fibonacci Numbers", "category": "math", "subcategory": "Sequences", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Generate Fibonacci numbers by count, maximum value, or index range."}, {"slug": "percentile-calculator", "name": "Percentile Calculator", "category": "math", "subcategory": "Statistics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate a percentile value or percentile rank for a numeric dataset."}, {"slug": "present-value-annuity-due-calculator", "name": "Present Value Annuity Due Calculator", "category": "finance", "subcategory": "TVM", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate the present value of an annuity due and compare it with an ordinary annuity."}, {"slug": "pvif-calculator", "name": "PVIF Calculator", "category": "finance", "subcategory": "TVM", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate the present value interest factor and discounted future value."}, {"slug": "pvifa-calculator", "name": "PVIFA Calculator", "category": "finance", "subcategory": "TVM", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate the present value interest factor of an annuity and optional present value."}, {"slug": "srt-to-csv", "name": "SRT to CSV Converter", "category": "text", "subcategory": "Subtitles", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert SRT subtitle content to CSV rows."}, {"slug": "srt-to-txt", "name": "SRT to TXT Converter", "category": "text", "subcategory": "Subtitles", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Extract plain, timestamped, JSON, or sentence text from SRT subtitles."}, {"slug": "stirling-numbers-calculator", "name": "Stirling Numbers Calculator", "category": "math", "subcategory": "Combinatorics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate unsigned Stirling numbers of the first kind and Stirling numbers of the second kind."}, {"slug": "base64-encoder", "name": "Base64 Encoder", "category": "dev", "subcategory": "Encoding", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Encode UTF-8 text as standard, URL-safe, or MIME line-wrapped Base64."}, {"slug": "crc32-checksum-calculator", "name": "CRC32 Checksum Calculator", "category": "hash", "subcategory": "Checksum", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate the IEEE CRC32 checksum of text in hex, decimal, and binary form."}, {"slug": "adler32-checksum-calculator", "name": "Adler-32 Checksum Calculator", "category": "hash", "subcategory": "Checksum", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate the Adler-32 checksum of UTF-8 text with A and B component breakdown."}, {"slug": "caesar-cipher-tool", "name": "Caesar Cipher Tool", "category": "text", "subcategory": "Cipher", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Encrypt or decrypt text with a Caesar shift cipher, with optional brute-force candidates."}, {"slug": "csv-to-json-converter", "name": "CSV to JSON Converter", "category": "dev", "subcategory": "Data Conversion", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert CSV text to JSON with delimiter auto-detection and type inference."}, {"slug": "diff-checker", "name": "Diff Checker", "category": "text", "subcategory": "Comparison", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Compare two texts line by line and return change statistics with a unified diff."}, {"slug": "find-replace-text", "name": "Find and Replace Text", "category": "text", "subcategory": "Modification", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Find and replace text with literal or regex patterns, case and whole-word options."}, {"slug": "smart-quotes-remover", "name": "Smart Quotes Remover", "category": "text", "subcategory": "Cleanup", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Replace curly smart quotes and primes with straight quotes, with JSON-safe escaping."}, {"slug": "bayes-theorem-calculator", "name": "Bayes' Theorem Calculator", "category": "math", "subcategory": "Probability", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate the posterior probability with Bayes' theorem, likelihood ratio, and natural frequencies."}, {"slug": "black-scholes-calculator", "name": "Black-Scholes Calculator", "category": "finance", "subcategory": "Options", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Price European call and put options with dividend-adjusted Black-Scholes and full Greeks."}, {"slug": "bmi-calculator", "name": "BMI Calculator", "category": "health", "subcategory": "Body Metrics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate Body Mass Index, BMI Prime, and healthy weight range in metric or imperial units."}, {"slug": "body-fat-percentage-calculator", "name": "Body Fat Percentage Calculator", "category": "health", "subcategory": "Body Metrics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimate body fat percentage with the US Navy method and age-adjusted healthy ranges."}, {"slug": "binary-converter", "name": "Binary Converter", "category": "math", "subcategory": "Number Systems", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert a binary number to decimal, hexadecimal, octal, or any base from 2 to 36."}, {"slug": "break-line-by-characters", "name": "Break Line by Characters", "category": "text", "subcategory": "Modification", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Insert line breaks at a maximum character count, with smart word-wrap or hard-break modes."}, {"slug": "beta-function-calculator", "name": "Beta Function Calculator", "category": "math", "subcategory": "Special Functions", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate the Euler beta function B(x, y) via the gamma function relationship."}, {"slug": "capm-calculator", "name": "CAPM Calculator", "category": "finance", "subcategory": "Investing", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Solve the Capital Asset Pricing Model for expected return, risk-free rate, market return, or beta."}, {"slug": "cagr-calculator", "name": "CAGR Calculator", "category": "finance", "subcategory": "Return", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate the compound annual growth rate between a beginning and ending value."}, {"slug": "budget-calculator", "name": "Budget Calculator", "category": "finance", "subcategory": "Planning", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Allocate income into needs, wants, and savings using the 50/30/20 budgeting rule."}, {"slug": "amicable-number-checker", "name": "Amicable Number Checker", "category": "math", "subcategory": "Number Theory", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Check whether two integers form an amicable pair, or find the partner of a single number."}, {"slug": "anagram-generator", "name": "Anagram Generator", "category": "text", "subcategory": "Word Games", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Generate letter-permutation anagrams of a word and check whether two words are anagrams."}, {"slug": "crc64-checksum-calculator", "name": "CRC64 Checksum Calculator", "category": "hash", "subcategory": "Checksum", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate the CRC64 checksum of text using ECMA-182, WE, or Jones polynomial variants."}, {"slug": "fnv1a-hash-generator", "name": "FNV-1a Hash Generator", "category": "hash", "subcategory": "Checksum", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Generate a fast non-cryptographic FNV-1a hash in 32, 64, 128, or 256-bit variants."}, {"slug": "euler-s-totient-function-calculator", "name": "Euler's Totient Function Calculator", "category": "math", "subcategory": "Number Theory", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate Euler's totient function phi(n) with its prime factorization."}, {"slug": "extended-euclidean-algorithm-calculator", "name": "Extended Euclidean Algorithm Calculator", "category": "math", "subcategory": "Number Theory", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Find the GCD of two integers and Bezout coefficients via the extended Euclidean algorithm."}, {"slug": "derangement-subfactorial-calculator", "name": "Derangement (Subfactorial) Calculator", "category": "math", "subcategory": "Combinatorics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate the number of derangements (subfactorial !n) for n elements."}, {"slug": "dew-point-calculator", "name": "Dew Point Calculator", "category": "science", "subcategory": "Weather", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate dew point temperature from air temperature and relative humidity using the Magnus formula."}, {"slug": "heat-index-calculator", "name": "Heat Index Calculator", "category": "science", "subcategory": "Weather", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate the NWS heat index (apparent temperature) from air temperature and relative humidity."}, {"slug": "creatinine-clearance-calculator", "name": "Creatinine Clearance Calculator", "category": "health", "subcategory": "Kidney Function", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimate creatinine clearance with the Cockcroft-Gault equation and CKD stage."}, {"slug": "effect-size-calculator", "name": "Effect Size Calculator", "category": "math", "subcategory": "Statistics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate Cohen's d, Hedges' g, Glass's delta, and related effect-size statistics for two groups."}, {"slug": "dollar-cost-averaging-calculator", "name": "Dollar Cost Averaging Calculator", "category": "finance", "subcategory": "Investing", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Simulate portfolio growth from regular periodic investments with compounding returns."}, {"slug": "url-encoder", "name": "URL Encoder", "category": "dev", "subcategory": "Encoding", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Percent-encode text for URLs using RFC 3986, query-string, path, or full encoding modes."}, {"slug": "url-decoder", "name": "URL Decoder", "category": "dev", "subcategory": "Encoding", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Decode percent-encoded URL text with optional plus-as-space handling and multi-layer detection."}, {"slug": "sha1-hash-generator", "name": "SHA1 Hash Generator", "category": "hash", "subcategory": "Digest", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Generate the SHA-1 hash (160-bit) of text."}, {"slug": "sha224-hash-generator", "name": "SHA-224 Hash Generator", "category": "hash", "subcategory": "Digest", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Generate the SHA-224 hash (224-bit) of text."}, {"slug": "sha3-256-hash-generator", "name": "SHA3-256 Hash Generator", "category": "hash", "subcategory": "Digest", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Generate the SHA3-256 hash (256-bit Keccak) of text."}, {"slug": "sha3-384-hash-generator", "name": "SHA3-384 Hash Generator", "category": "hash", "subcategory": "Digest", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Generate the SHA3-384 hash (384-bit Keccak) of text."}, {"slug": "roman-numerals-converter", "name": "Roman Numerals Converter", "category": "math", "subcategory": "Number Systems", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert between Roman numerals and Arabic numbers (1-3999) with canonical-form checking."}, {"slug": "morse-code-decoder", "name": "Morse Code Decoder", "category": "text", "subcategory": "Encoding", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Decode International Morse Code to text (single space between letters, three spaces between words)."}, {"slug": "chinese-remainder-theorem-calculator", "name": "Chinese Remainder Theorem Calculator", "category": "math", "subcategory": "Number Theory", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Solve a system of simultaneous congruences with pairwise coprime moduli using the CRT."}, {"slug": "modular-exponentiation-calculator", "name": "Modular Exponentiation Calculator", "category": "math", "subcategory": "Number Theory", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Compute base^exponent mod modulus efficiently with binary square-and-multiply statistics."}, {"slug": "force-calculator", "name": "Force Calculator", "category": "science", "subcategory": "Physics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Solve Newton's second law for force, mass, or acceleration with common unit conversions."}, {"slug": "velocity-calculator", "name": "Velocity Calculator", "category": "science", "subcategory": "Physics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate average velocity, distance, time, or relative velocity with distance, time, and speed units."}, {"slug": "torque-calculator", "name": "Torque Calculator", "category": "science", "subcategory": "Physics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Solve torque, force, lever arm distance, or angle using tau = F r sin(theta)."}, {"slug": "kinetic-energy-calculator", "name": "Kinetic Energy Calculator", "category": "science", "subcategory": "Physics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Solve kinetic energy, mass, or velocity with KE = 1/2 m v^2 and unit conversions."}, {"slug": "potential-energy-calculator", "name": "Potential Energy Calculator", "category": "science", "subcategory": "Physics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate gravitational or elastic potential energy and solve for missing variables."}, {"slug": "energy-converter", "name": "Energy Converter", "category": "science", "subcategory": "Unit Converters", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert energy between joules, calories, BTU, watt-hours, electronvolts, ergs, and therms."}, {"slug": "power-converter", "name": "Power Converter", "category": "science", "subcategory": "Unit Converters", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert power among watts, kilowatts, horsepower, BTU per hour, refrigeration tons, and related units."}, {"slug": "decibel-db-calculator", "name": "Decibel (dB) Calculator", "category": "science", "subcategory": "Electronics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate power dB, voltage dB, dB ratios, and dBm/dBW/watt conversions."}, {"slug": "resonant-frequency-calculator", "name": "Resonant Frequency Calculator", "category": "science", "subcategory": "Electronics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate LC/RLC resonant frequency, inductance, capacitance, impedance, Q factor, and bandwidth."}, {"slug": "ultimate-frequency-wavelength-converter", "name": "Ultimate Frequency & Wavelength Converter", "category": "science", "subcategory": "Unit Converters", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert between frequency and wavelength using a configurable propagation speed and identify the spectrum band."}, {"slug": "bpm-to-ms-delay-calculator", "name": "BPM to Millisecond Delay Calculator", "category": "math", "subcategory": "Audio", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert tempo in BPM into synchronized straight, dotted, and triplet delay times."}, {"slug": "cost-per-mile-calculator", "name": "Cost Per Mile Calculator", "category": "finance", "subcategory": "Vehicle Costs", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimate total annual driving cost and the true cost per mile from fuel and ownership costs."}, {"slug": "cubic-meters-to-cubic-feet", "name": "Cubic Meters to Cubic Feet", "category": "math", "subcategory": "Volume Converters", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert cubic meters and cubic feet with common volume equivalents."}, {"slug": "friction-calculator", "name": "Friction Calculator", "category": "physics", "subcategory": "Mechanics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate static and kinetic friction, sliding state, and acceleration from mass or normal force."}, {"slug": "gallons-to-liters-converter", "name": "Gallons to Liters Converter", "category": "math", "subcategory": "Volume Converters", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert US or UK gallons to liters, with a reverse conversion mode."}, {"slug": "inches-to-mm-converter", "name": "Inches to Millimeters Converter", "category": "math", "subcategory": "Length Converters", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert decimal, fractional, or mixed-number inches to millimeters."}, {"slug": "inductive-reactance-calculator", "name": "Inductive Reactance Calculator", "category": "electronics", "subcategory": "AC Circuits", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Solve XL = 2\u03c0fL for inductive reactance, frequency, or inductance."}, {"slug": "3-phase-power-calculator", "name": "3-Phase Power Calculator", "category": "electronics", "subcategory": "AC Circuits", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate balanced three-phase real, apparent, and reactive power."}, {"slug": "amps-to-watts-calculator", "name": "Amps to Watts Calculator", "category": "electronics", "subcategory": "AC Circuits", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert current and voltage into real, apparent, and reactive power."}, {"slug": "asphalt-calculator", "name": "Asphalt Calculator", "category": "construction", "subcategory": "Materials", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimate asphalt volume, tonnage, waste buffer, truckloads, and material cost."}, {"slug": "greatest-common-factor-calculator", "name": "Greatest Common Factor Calculator", "category": "math", "subcategory": "Number Theory", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Find the GCF of up to 15 numbers with prime factorizations and all common factors."}, {"slug": "least-common-multiple-calculator", "name": "Least Common Multiple Calculator", "category": "math", "subcategory": "Number Theory", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Find the LCM of up to 15 numbers with prime factorizations and the GCF cross-check."}, {"slug": "primitive-root-calculator", "name": "Primitive Root Calculator", "category": "math", "subcategory": "Number Theory", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Test whether primitive roots exist modulo n and list them with \u03c6(n)."}, {"slug": "mobius-function-calculator", "name": "M\u00f6bius Function Calculator", "category": "math", "subcategory": "Number Theory", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Evaluate the M\u00f6bius function \u03bc(n) from the prime factorization of n."}, {"slug": "continued-fraction-calculator", "name": "Continued Fraction Calculator", "category": "math", "subcategory": "Number Theory", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Expand a decimal, fraction, or square root into a continued fraction with convergents."}, {"slug": "divisibility-test-calculator", "name": "Divisibility Test Calculator", "category": "math", "subcategory": "Number Theory", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Test a number against common divisors, primes, or custom divisors with rule explanations."}, {"slug": "quotient-and-remainder-calculator", "name": "Quotient and Remainder Calculator", "category": "math", "subcategory": "Basic Math", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Compute the integer quotient and remainder of a division with verification."}, {"slug": "entropy-calculator", "name": "Entropy Calculator", "category": "math", "subcategory": "Statistics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate Shannon entropy of a probability distribution in bits, nats, or dits."}, {"slug": "ceiling-and-floor-function-calculator", "name": "Ceiling and Floor Function Calculator", "category": "math", "subcategory": "Functions", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Evaluate floor, ceiling, fractional part, and nearest integer of a value."}, {"slug": "average-rate-of-change-calculator", "name": "Average Rate of Change Calculator", "category": "math", "subcategory": "Calculus", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Compute the average rate of change of f(x) on [a, b] with the secant line equation."}, {"slug": "prime-factorization-calculator", "name": "Prime Factorization Calculator", "category": "math", "subcategory": "Number Theory", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Factor a number up to 10^15 into primes with exponent form and divisor count."}, {"slug": "prime-factor-calculator", "name": "Prime Factor Calculator", "category": "math", "subcategory": "Number Theory", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Prime factors plus divisor sum, Euler's totient, and abundant/deficient/perfect classification."}, {"slug": "factor-calculator", "name": "Factor Calculator", "category": "math", "subcategory": "Number Theory", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "List all factors and factor pairs of a number up to 10^12 with its prime factorization."}, {"slug": "is-it-a-prime-number", "name": "Prime Number Checker", "category": "math", "subcategory": "Number Theory", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Check whether a number up to 10^15 is prime, with factorization and the 5 nearest primes either side."}, {"slug": "first-n-prime-numbers", "name": "First n Prime Numbers", "category": "math", "subcategory": "Number Theory", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Generate the first n primes (up to 10,000) with twin-prime pairs and gap statistics."}, {"slug": "list-of-prime-numbers", "name": "List of Prime Numbers", "category": "math", "subcategory": "Number Theory", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "List every prime from 2 up to a limit (max 10,000) with density and twin-prime statistics."}, {"slug": "sum-of-positive-integers-calculator", "name": "Sum of Positive Integers Calculator", "category": "math", "subcategory": "Sequences", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Sum consecutive integers n1..n2 exactly with Gauss's pairing formula."}, {"slug": "cube-numbers-list", "name": "Cube Numbers List", "category": "math", "subcategory": "Sequences", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "List cube numbers n\u00b3 for bases up to 1000 with sums and prime-base counts."}, {"slug": "number-of-digits", "name": "Number of Digits", "category": "math", "subcategory": "Basic Math", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Count the digits of any integer with digit frequency, palindrome check, and scientific notation."}, {"slug": "binomial-theorem-expansion-calculator", "name": "Binomial Theorem Expansion Calculator", "category": "math", "subcategory": "Algebra", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Expand (a + b)^n for n up to 50 with every coefficient and term listed."}, {"slug": "nth-root-calculator", "name": "Nth Root Calculator", "category": "math", "subcategory": "Basic Math", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "High-precision nth roots (up to 100 decimals) with exact-root detection and verification."}, {"slug": "exponents-calculator", "name": "Exponents Calculator", "category": "math", "subcategory": "Exponents", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Raise a base to any power: exact decimal arithmetic for integer exponents up to \u00b1500."}, {"slug": "log-calculator", "name": "Log Calculator", "category": "math", "subcategory": "Logarithms", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Logarithm of x in base 10, e, 2, or any custom base, with all three standard logs for comparison."}, {"slug": "natural-log-calculator", "name": "Natural Log Calculator", "category": "math", "subcategory": "Logarithms", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "ln(x) with log10, log2, the derivative 1/x, and e^x, flagging exact powers of e."}, {"slug": "percent-to-decimal-converter", "name": "Percent to Decimal Converter", "category": "math", "subcategory": "Percentage", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert one or many percentages to decimals (divide by 100), batch input supported."}, {"slug": "percentage-decrease-calculator", "name": "Percentage Decrease Calculator", "category": "math", "subcategory": "Percentage", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Find a percentage decrease, apply one to a value, or recover the original value before a decrease."}, {"slug": "rounding-calculator", "name": "Rounding Calculator", "category": "math", "subcategory": "Number Formatting", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Round to decimal places, significant figures, or the nearest multiple with 6 rounding methods compared."}, {"slug": "ratio-calculator", "name": "Ratio Calculator", "category": "math", "subcategory": "Ratios", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Solve a:b = c:d proportions, simplify or scale ratios, and generate equivalent ratio tables."}, {"slug": "sum-calculator", "name": "Sum Calculator", "category": "math", "subcategory": "Basic Math", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "High-precision decimal sum of up to 5000 numbers with average, median, and sign statistics."}, {"slug": "range-calculator", "name": "Range Calculator", "category": "math", "subcategory": "Statistics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Range (max \u2212 min) of a data set with quartiles, IQR, midrange, and a spread rating."}, {"slug": "matrix-multiplication-calculator", "name": "Matrix Multiplication Calculator", "category": "math", "subcategory": "Linear Algebra", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Multiply two matrices (up to 10x10) with exact fraction arithmetic."}, {"slug": "matrix-inverse-calculator", "name": "Matrix Inverse Calculator", "category": "math", "subcategory": "Linear Algebra", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Invert a square matrix (2x2 to 8x8) by exact Gauss-Jordan elimination, with determinant."}, {"slug": "matrix-rank-calculator", "name": "Matrix Rank Calculator", "category": "math", "subcategory": "Linear Algebra", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Rank, nullity, pivot and free columns of a matrix (up to 10x10) via exact row reduction."}, {"slug": "matrix-power-calculator", "name": "Matrix Power Calculator", "category": "math", "subcategory": "Linear Algebra", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Raise a square matrix (up to 6x6) to any integer power from -10 to 20, exactly."}, {"slug": "matrix-lu-decomposition-calculator", "name": "Matrix LU Decomposition Calculator", "category": "math", "subcategory": "Linear Algebra", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Factor a square matrix (2x2 to 8x8) into PA = LU with partial pivoting, exactly."}, {"slug": "rref-calculator-row-echelon-form", "name": "RREF Calculator (Row Echelon Form)", "category": "math", "subcategory": "Linear Algebra", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Reduced row echelon form (up to 10x10) with rank, pivots, and augmented-system analysis."}, {"slug": "null-space-calculator", "name": "Null Space Calculator", "category": "math", "subcategory": "Linear Algebra", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Kernel basis vectors of a matrix (up to 8x8) via exact RREF, with verification."}, {"slug": "system-of-linear-equations-solver", "name": "System of Linear Equations Solver", "category": "math", "subcategory": "Algebra", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Solve n x n linear systems (2 to 8 unknowns) exactly, including parametric infinite-solution forms."}, {"slug": "gram-schmidt-calculator", "name": "Gram-Schmidt Calculator", "category": "math", "subcategory": "Linear Algebra", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Orthogonalize 2-10 vectors (dimension 2-10): exact orthogonal basis plus orthonormal vectors."}, {"slug": "eigenvalue-eigenvector-calculator", "name": "Eigenvalue and Eigenvector Calculator", "category": "math", "subcategory": "Linear Algebra", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Eigenvalues and eigenvectors of 2x2 and 3x3 matrices, exact when rational, complex included."}, {"slug": "normal-distribution-calculator", "name": "Normal Distribution Calculator", "category": "math", "subcategory": "Probability", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Normal probabilities: left/right tail, between two values, or inverse lookup, with z-scores and PDF."}, {"slug": "exponential-distribution-calculator", "name": "Exponential Distribution Calculator", "category": "math", "subcategory": "Probability", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Exponential distribution probabilities (P(X<=x), P(X>x), between) plus mean, median, and variance."}, {"slug": "negative-binomial-distribution-calculator", "name": "Negative Binomial Distribution Calculator", "category": "math", "subcategory": "Probability", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Negative binomial PMF and cumulative probabilities in failures or total-trials parametrization."}, {"slug": "confidence-interval-for-proportion-calculator", "name": "Confidence Interval for Proportion Calculator", "category": "math", "subcategory": "Statistics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Wald and Wilson score confidence intervals for a proportion at eight confidence levels."}, {"slug": "sample-size-calculator", "name": "Sample Size Calculator", "category": "math", "subcategory": "Statistics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Survey sample size from confidence level, margin of error, and optional finite-population correction."}, {"slug": "odds-ratio-calculator", "name": "Odds Ratio Calculator", "category": "math", "subcategory": "Statistics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Odds ratio with Woolf CI, relative risk, NNT, and Yates-corrected chi-square from a 2x2 table."}, {"slug": "relative-risk-calculator", "name": "Relative Risk Calculator", "category": "math", "subcategory": "Statistics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Relative risk with confidence interval, attributable fractions, NNT, and significance test."}, {"slug": "spearman-rank-correlation-calculator", "name": "Spearman Rank Correlation Calculator", "category": "math", "subcategory": "Statistics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Spearman's rho with average-rank tie handling, tie correction, and t-based significance."}, {"slug": "linear-regression-calculator", "name": "Linear Regression Calculator", "category": "math", "subcategory": "Statistics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Least-squares line with r, R-squared, standard errors, sums of squares, and optional prediction."}, {"slug": "central-limit-theorem-calculator", "name": "Central Limit Theorem Calculator", "category": "math", "subcategory": "Statistics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Sampling-distribution probabilities for the sample mean via the CLT (standard error, z-scores)."}, {"slug": "ideal-weight-calculator", "name": "Ideal Weight Calculator", "category": "health", "subcategory": "Body Metrics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Ideal body weight via Devine, Robinson, Miller, and Hamwi formulas with frame-size adjustment and healthy BMI range."}, {"slug": "lean-body-mass-calculator", "name": "Lean Body Mass Calculator", "category": "health", "subcategory": "Body Metrics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Lean body mass via Boer, James, and Hume equations with estimated body fat percentage and category."}, {"slug": "max-heart-rate-calculator", "name": "Max Heart Rate Calculator", "category": "health", "subcategory": "Fitness", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Maximum heart rate from six validated formulas (Fox, Tanaka, Gellish, Gulati, Nes, Arena) with training zones."}, {"slug": "one-rep-max-calculator", "name": "One Rep Max (1RM) Calculator", "category": "health", "subcategory": "Fitness", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "One-rep max estimated by seven formulas (Brzycki, Epley, Lander, Lombardi, Mayhew, O'Conner, Wathan) with training zones and warm-up sets."}, {"slug": "gfr-calculator", "name": "GFR Calculator", "category": "health", "subcategory": "Kidney Function", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimated GFR via CKD-EPI 2021 (primary), CKD-EPI 2009, MDRD, and Cockcroft-Gault with CKD staging."}, {"slug": "corrected-calcium-calculator", "name": "Corrected Calcium Calculator", "category": "health", "subcategory": "Lab Values", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Albumin-corrected calcium (Payne 0.8 or modified 0.6 coefficient) with clinical interpretation."}, {"slug": "corrected-sodium-calculator", "name": "Corrected Sodium Calculator", "category": "health", "subcategory": "Lab Values", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Hyperglycemia-corrected sodium via Katz and Hillier formulas with severity interpretation."}, {"slug": "hba1c-calculator", "name": "HbA1c Calculator", "category": "health", "subcategory": "Diabetes", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert between HbA1c percentage and estimated average glucose (mg/dL and mmol/L) with ADA interpretation."}, {"slug": "blood-sugar-converter", "name": "Blood Sugar Converter", "category": "health", "subcategory": "Diabetes", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert blood glucose between mg/dL and mmol/L with fasting-range category and reference table."}, {"slug": "anc-calculator", "name": "ANC Calculator", "category": "health", "subcategory": "Lab Values", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Absolute neutrophil count from CBC values with NCI CTCAE neutropenia grading."}, {"slug": "npv-calculator", "name": "NPV Calculator", "category": "finance", "subcategory": "Investing", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Net present value with IRR, profitability index, payback periods, decision guidance, and rate sensitivity."}, {"slug": "irr-calculator", "name": "IRR Calculator", "category": "finance", "subcategory": "Investing", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Internal rate of return solved by bisection for uniform or variable cash flows, with rating and profit summary."}, {"slug": "compound-daily-interest-calculator", "name": "Compound Daily Interest Calculator", "category": "finance", "subcategory": "Interest", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Daily compounding growth of a trading account vs linear gains, with doubling time, milestones, and target days."}, {"slug": "sip-calculator", "name": "SIP Calculator", "category": "finance", "subcategory": "Investing", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Systematic investment plan projection with optional annual step-up and initial lump sum, month-by-month compounding."}, {"slug": "fixed-deposit-calculator", "name": "Fixed Deposit Calculator", "category": "finance", "subcategory": "Savings", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Fixed deposit maturity value and interest for simple, periodic, or continuous compounding with effective annual rate."}, {"slug": "sharpe-ratio-calculator", "name": "Sharpe Ratio Calculator", "category": "finance", "subcategory": "Investing", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Sharpe ratio from summary statistics or a series of periodic returns (annualized), with performance rating."}, {"slug": "holding-period-return-calculator", "name": "Holding Period Return Calculator", "category": "finance", "subcategory": "Investing", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Holding period return with income and capital-gains yield split, return multiple, and optional annualized return."}, {"slug": "real-rate-of-return-calculator", "name": "Real Rate of Return Calculator", "category": "finance", "subcategory": "Investing", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Inflation-adjusted real return via the Fisher equation, vs the simple approximation, with optional projection."}, {"slug": "discount-factor-calculator", "name": "Discount Factor Calculator", "category": "finance", "subcategory": "Time Value", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Discount factor and present value for discrete or continuous compounding with a period-by-period table."}, {"slug": "mortgage-payoff-calculator", "name": "Mortgage Payoff Calculator", "category": "finance", "subcategory": "Loans", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Early mortgage payoff simulation with extra monthly, yearly, and one-time payments; time and interest saved."}, {"slug": "days-in-month", "name": "Days in Month", "category": "time-date", "subcategory": "Date Tools", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Number of days in a given month/year with leap-year detection and calendar boundary details."}, {"slug": "add-business-days-to-date", "name": "Add Business Days to Date", "category": "time-date", "subcategory": "Date Tools", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Add or subtract business days from a date, skipping weekends under a configurable workweek pattern."}, {"slug": "age-calculator", "name": "Age Calculator", "category": "time-date", "subcategory": "Date Tools", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Exact age in years/months/days plus total days, next-birthday countdown, day born, and zodiac sign."}, {"slug": "time-zone-converter", "name": "Time Zone Converter", "category": "time-date", "subcategory": "Time Conversion", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert a local date/time between IANA time zones with DST-aware offsets, to one or more targets."}, {"slug": "first-n-digits-of-pi", "name": "First n Digits of Pi", "category": "math", "subcategory": "Basic Math", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "First n digits of pi (Chudnovsky series, exact via Decimal) with digit-frequency analysis."}, {"slug": "first-n-digits-of-e", "name": "First n Digits of e", "category": "math", "subcategory": "Basic Math", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "First n digits of Euler's number e (Decimal series sum 1/n!) with digit-frequency analysis."}, {"slug": "fena-calculator", "name": "FENa Calculator", "category": "health", "subcategory": "Kidney Function", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Fractional excretion of sodium (FENa) with prerenal / indeterminate / intrinsic-renal interpretation."}, {"slug": "due-date-calculator", "name": "Due Date Calculator", "category": "health", "subcategory": "Pregnancy", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Pregnancy due date via Naegele's rule from LMP, conception date, or ultrasound, with trimester milestones."}, {"slug": "general-triangle-solver", "name": "General Triangle Solver", "category": "math", "subcategory": "Geometry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Solve any triangle (SSS, SAS, ASA, AAS, or the ambiguous SSA case) for all sides, angles, and area."}, {"slug": "inscribed-circle-incircle-calculator", "name": "Inscribed Circle (Incircle) Calculator", "category": "math", "subcategory": "Geometry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Incircle radius (and incenter, from vertex coordinates) of a triangle from side lengths or points."}, {"slug": "polynomial-roots-calculator", "name": "Polynomial Roots Calculator", "category": "math", "subcategory": "Algebra", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Real and complex roots of a polynomial (degree up to 12) via exact formulas or Durand-Kerner iteration."}, {"slug": "maclaurin-series-calculator", "name": "Maclaurin Series Calculator", "category": "math", "subcategory": "Calculus", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Exact-coefficient Maclaurin (Taylor at 0) series expansion for common functions, with optional evaluation."}, {"slug": "distance-speed-time-triangle-calculator", "name": "Distance-Speed-Time Triangle Calculator", "category": "math", "subcategory": "Algebra", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Solve distance, speed, or time from the other two, plus multi-leg average speed and round-trip harmonic mean."}, {"slug": "spring-constant-calculator", "name": "Spring Constant Calculator", "category": "science", "subcategory": "Physics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Hooke's law solver for force, spring constant, or displacement, plus elastic energy and oscillation period."}, {"slug": "stopping-distance-calculator", "name": "Stopping Distance Calculator", "category": "science", "subcategory": "Physics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Vehicle reaction + braking stopping distance by road condition (dry/wet/snow/ice), km/h or mph."}, {"slug": "miter-angle-calculator", "name": "Miter Angle Calculator", "category": "construction", "subcategory": "Layout", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Miter and bevel saw angles for flat trim or compound crown-molding cuts, given the corner angle."}, {"slug": "brick-and-mortar-calculator", "name": "Brick and Mortar Calculator", "category": "construction", "subcategory": "Materials", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Brick count and mortar volume/bag estimate for a wall, by brick type, bond thickness, and waste allowance."}, {"slug": "closing-costs-calculator", "name": "Closing Costs Calculator", "category": "finance", "subcategory": "Real Estate", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Generic national-average estimate of home purchase or refinance closing costs by fee category."}, {"slug": "employee-cost-calculator", "name": "Employee Cost Calculator", "category": "business", "subcategory": "Cost Calculators", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "True employer cost of a hire: salary plus payroll taxes, benefits, PTO, equipment, training, and recruiting."}, {"slug": "appliance-energy-cost-calculator", "name": "Appliance Energy Cost Calculator", "category": "home", "subcategory": "Energy Calculators", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Daily, monthly, and annual electricity cost for an appliance from wattage, usage hours, and rate."}, {"slug": "percentage-error-calculator", "name": "Percentage Error Calculator", "category": "math", "subcategory": "Percentage", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate percent error between estimated and actual values."}, {"slug": "percent-yield-calculator", "name": "Percent Yield Calculator", "category": "science", "subcategory": "Chemistry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Solve percent yield, actual yield, or theoretical yield."}, {"slug": "percent-to-ppm-converter", "name": "Percent to PPM Converter", "category": "math", "subcategory": "Unit Converters", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert percent to ppm or ppm to percent."}, {"slug": "ppm-to-percent-converter", "name": "PPM to Percent Converter", "category": "math", "subcategory": "Unit Converters", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert parts per million to percentage and related concentration scales."}, {"slug": "unit-rate-calculator", "name": "Unit Rate Calculator", "category": "math", "subcategory": "Ratios", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate a unit rate or compare two unit rates."}, {"slug": "markup-calculator", "name": "Markup Calculator", "category": "finance", "subcategory": "Retail", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate markup percentage, selling price, cost, profit, and margin."}, {"slug": "discount-calculator", "name": "Discount Calculator", "category": "finance", "subcategory": "Discounts", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate final price, savings, tax, stacked discounts, or BOGO deals."}, {"slug": "mean-calculator", "name": "Mean Calculator", "category": "math", "subcategory": "Statistics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate arithmetic mean and supporting summary statistics."}, {"slug": "median-calculator", "name": "Median Calculator", "category": "math", "subcategory": "Statistics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate the median, sorted data, quartiles, and range."}, {"slug": "mode-calculator", "name": "Mode Calculator", "category": "math", "subcategory": "Statistics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Find the mode or modes and frequency table for a numeric dataset."}, {"slug": "taylor-series-calculator", "name": "Taylor Series Calculator", "category": "math", "subcategory": "Calculus", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Taylor series expansion of common functions about any center a, using exact shifted-derivative formulas, with optional evaluation."}, {"slug": "infinite-series-sum-calculator", "name": "Infinite Series Sum Calculator", "category": "math", "subcategory": "Calculus", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Closed-form sums for classic infinite series: geometric, p-series, telescoping, alternating harmonic, Leibniz, Basel, e^x, and alternating p-series."}, {"slug": "series-convergence-test-calculator", "name": "Series Convergence Test Calculator", "category": "math", "subcategory": "Calculus", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convergence verdict (absolute/conditional/divergent) for common series families with ratio, root, and divergence test estimates."}, {"slug": "expand-polynomials-calculator", "name": "Expand Polynomials Calculator", "category": "math", "subcategory": "Algebra", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Expand a product of polynomial factors (optionally raised to a power) into standard form with exact rational coefficients."}, {"slug": "polynomial-factoring-calculator", "name": "Polynomial Factoring Calculator", "category": "math", "subcategory": "Algebra", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Factor a polynomial over the rationals: content, rational roots with multiplicity, linear factors, and any irreducible remainder."}, {"slug": "polynomial-long-division-calculator", "name": "Polynomial Long Division Calculator", "category": "math", "subcategory": "Algebra", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Divide one polynomial by another with exact rational arithmetic, returning quotient, remainder, and step-by-step subtraction."}, {"slug": "projectile-motion-calculator", "name": "Projectile Motion Calculator", "category": "science", "subcategory": "Physics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Projectile range, max height, flight time, and impact speed/angle from launch speed, angle, height, and gravity."}, {"slug": "pendulum-period-calculator", "name": "Pendulum Period Calculator", "category": "science", "subcategory": "Physics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Simple pendulum solver for period, length, gravity, or frequency with planet presets and a large-amplitude correction."}, {"slug": "terminal-velocity-calculator", "name": "Terminal Velocity Calculator", "category": "science", "subcategory": "Physics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Terminal velocity from mass, drag coefficient, area, and fluid density, with object presets and approach-time milestones."}, {"slug": "syllable-counter", "name": "Syllable Counter", "category": "text", "subcategory": "Text Statistics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Count syllables per word, line, and text with haiku detection and Flesch reading ease."}, {"slug": "beam-load-calculator", "name": "Beam Load Calculator", "category": "construction", "subcategory": "Structural", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Beam bending moment, shear, stress, and deflection for common support/load cases with strength and serviceability checks."}, {"slug": "bolt-torque-calculator", "name": "Bolt Torque Calculator", "category": "science", "subcategory": "Mechanics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Recommended bolt tightening torque and preload for metric sizes and ISO grades, by the short-form K method and VDI 2230."}, {"slug": "cost-of-raising-a-child-calculator", "name": "Cost of Raising a Child Calculator", "category": "finance", "subcategory": "Planning", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Project the cost of raising a child to 18 by spending category with income tier, siblings, inflation, and optional college."}, {"slug": "steel-weight-calculator", "name": "Steel Weight Calculator", "category": "construction", "subcategory": "Materials", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Weight of steel and other metal bars, plates, pipes, tubes, and angles from shape dimensions, density, and quantity."}, {"slug": "drywall-calculator", "name": "Drywall Calculator", "category": "construction", "subcategory": "Materials", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Drywall sheets, joint compound, tape, and screws needed for walls and ceilings with a waste allowance."}, {"slug": "military-time-converter", "name": "Military Time Converter", "category": "time-date", "subcategory": "Time Conversion", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert between 12-hour, 24-hour, and military time, including the spoken military form."}, {"slug": "week-number-calculator", "name": "Week Number Calculator", "category": "time-date", "subcategory": "Date Tools", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "ISO 8601 and North American week numbers for a date, with week ranges, or the dates of a given ISO week."}, {"slug": "salary-raise-calculator", "name": "Salary Raise Calculator", "category": "finance", "subcategory": "Salary", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "New salary after a raise by percent, target salary, or flat amount, with per-period breakdown and inflation-adjusted real raise."}, {"slug": "credit-utilization-calculator", "name": "Credit Utilization Calculator", "category": "finance", "subcategory": "Credit Card Calculators", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Per-card and overall credit utilization with score-band ratings and pay-down targets to reach 30 and 10 percent."}, {"slug": "prorated-rent-calculator", "name": "Prorated Rent Calculator", "category": "finance", "subcategory": "Real Estate", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Prorate rent for a partial month from a move date, comparing actual-days, banker's 30-day, and annual-basis methods."}, {"slug": "angular-velocity-calculator", "name": "Angular Velocity Calculator", "category": "science", "subcategory": "Physics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert angular velocity between rad/s, RPM, Hz, deg/s, and period, or derive it from linear speed and radius with tangential and centripetal results."}, {"slug": "coulomb-s-law-calculator", "name": "Coulomb's Law Calculator", "category": "science", "subcategory": "Physics Calculators", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Electrostatic force between two point charges via Coulomb's law, solving for force, charge, or distance with dielectric media."}, {"slug": "doppler-effect-calculator", "name": "Doppler Effect Calculator", "category": "science", "subcategory": "Physics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Observed frequency shift for moving sources and observers, classical for sound or relativistic for light."}, {"slug": "snell-s-law-calculator", "name": "Snell's Law Calculator", "category": "science", "subcategory": "Physics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Refraction angles, indices, critical angle, and Brewster angle from Snell's law with a built-in material library."}, {"slug": "lens-equation-calculator", "name": "Lens Equation Calculator", "category": "science", "subcategory": "Physics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Thin-lens equation solver for image distance, focal length, or object distance with magnification and image properties."}, {"slug": "reynolds-number-calculator", "name": "Reynolds Number Calculator", "category": "science", "subcategory": "Fluid Mechanics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Reynolds number with laminar/transitional/turbulent classification using geometry-specific thresholds for pipes, plates, and channels."}, {"slug": "time-dilation-calculator", "name": "Time Dilation Calculator", "category": "science", "subcategory": "Physics Calculators", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Relativistic time dilation, Lorentz factor, clock rate, and optional length contraction at any sub-light speed."}, {"slug": "specific-heat-capacity-calculator", "name": "Specific Heat Capacity Calculator", "category": "science", "subcategory": "Physics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Solve Q = m*c*dT for heat, mass, specific heat, or final temperature with a substance library and mixed units."}, {"slug": "ph-calculator", "name": "pH Calculator", "category": "science", "subcategory": "Chemistry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "pH, pOH, [H+], and [OH-] from any one of them, with acidity classification at 25 C."}, {"slug": "digital-root-calculator", "name": "Digital Root Calculator", "category": "math", "subcategory": "Number Theory", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Repeated digit sum or product to a single digit in base 2, 8, 10, or 16, with persistence and the casting-out-nines formula check."}, {"slug": "401-k-calculator", "name": "401(k) Calculator", "category": "finance", "subcategory": "Retirement", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Project 401(k) growth to retirement with employer matching, IRS contribution limits, salary raises, and year-by-year balances."}, {"slug": "stock-average-calculator", "name": "Stock Average Calculator", "category": "finance", "subcategory": "Investing", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Average cost per share after buying more shares, with breakeven price and optional profit/loss at the current price."}, {"slug": "stock-split-calculator", "name": "Stock Split Calculator", "category": "finance", "subcategory": "Investing", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Post-split shares, price, cost basis, and fractional-share handling for forward and reverse stock splits."}, {"slug": "paypal-fee-calculator", "name": "PayPal Fee Calculator", "category": "finance", "subcategory": "Sales", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "PayPal fee and net for a received payment, or the gross-up invoice amount needed to net a target after fees."}, {"slug": "emergency-fund-calculator", "name": "Emergency Fund Calculator", "category": "finance", "subcategory": "Planning", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Emergency fund target by employment profile and dependents, with 3/6/9/12-month tiers and time to reach each."}, {"slug": "net-worth-calculator", "name": "Net Worth Calculator", "category": "finance", "subcategory": "Planning", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Net worth from itemized assets and liabilities with debt-to-asset ratio, health rating, and milestone tracking."}, {"slug": "waist-to-hip-ratio-calculator", "name": "Waist to Hip Ratio Calculator", "category": "health", "subcategory": "Body Metrics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Waist-to-hip ratio with WHO risk category, body shape pattern, and the waist target for a healthy ratio."}, {"slug": "child-height-predictor", "name": "Child Height Predictor", "category": "health", "subcategory": "Body Metrics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Predicted adult height from parents' heights via the mid-parental (Tanner) method with range and adult percentile."}, {"slug": "jwt-decoder", "name": "JWT Decoder", "category": "dev", "subcategory": "Encoding", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Decode a JWT header and payload without verifying the signature, with registered claims and UTC claim times."}, {"slug": "pig-latin-translator", "name": "Pig Latin Translator", "category": "text", "subcategory": "Word Games", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Translate English to Pig Latin and back in four dialects with qu-handling, case preservation, and Y rules."}, {"slug": "paint-calculator", "name": "Paint Calculator", "category": "construction", "subcategory": "Materials", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Paint quantity for walls, ceiling, and trim with door/window deductions, texture adjustment, and multi-coat coverage."}, {"slug": "fence-calculator", "name": "Fence Calculator", "category": "construction", "subcategory": "Materials", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Fence posts, rails, pickets or panels, concrete, and gate hardware for privacy, picket, post-and-rail, or panel fence styles."}, {"slug": "rebar-calculator", "name": "Rebar Calculator", "category": "construction", "subcategory": "Structural", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Rebar bar count, total linear footage, and weight for a concrete slab grid, sizes #3-#10 with cover and waste allowance."}, {"slug": "concrete-calculator", "name": "Concrete Calculator", "category": "construction", "subcategory": "Materials", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Concrete volume in cubic feet/yards/meters plus pre-mix bag counts for slabs, footings, round columns, and staircases."}, {"slug": "mulch-soil-gravel-calculator", "name": "Mulch, Soil & Gravel Calculator", "category": "home", "subcategory": "Garden Calculators", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Volume, weight, bag count, and truck-load estimate for mulch, topsoil, gravel, or sand over a rectangular area."}, {"slug": "property-tax-calculator", "name": "Property Tax Calculator", "category": "finance", "subcategory": "Taxes", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Annual and monthly property tax from home value, assessment ratio, tax rate (percent or mills), exemptions, and a 10-year projection."}, {"slug": "eoq-calculator", "name": "EOQ Calculator", "category": "business", "subcategory": "Cost Calculators", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Economic Order Quantity that minimizes combined ordering and holding cost, with orders/year, cycle length, and reorder point."}, {"slug": "epf-calculator", "name": "EPF Calculator", "category": "finance", "subcategory": "Retirement", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "India Employees Provident Fund maturity corpus, splitting the employer's 12% into EPF and the EPS pension slice, with year-end interest compounding."}, {"slug": "customer-lifetime-value-clv-calculator", "name": "Customer Lifetime Value (CLV) Calculator", "category": "marketing", "subcategory": "Unit Economics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Customer lifetime value from ARPU, gross margin, and retention rate via a discounted-perpetuity model, with CLV:CAC health rating."}, {"slug": "decimal-to-bcd-converter", "name": "Decimal to BCD Converter", "category": "math", "subcategory": "Number Systems", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert a decimal integer to Binary-Coded Decimal (4 bits per digit), with a plain-binary comparison."}, {"slug": "moment-of-inertia-calculator", "name": "Moment of Inertia Calculator", "category": "science", "subcategory": "Physics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Area moment of inertia (rectangle, circle, hollow circle, triangle) or mass moment of inertia (rod, cylinder, sphere, hollow cylinder), in SI units."}, {"slug": "henderson-hasselbalch-calculator", "name": "Henderson-Hasselbalch Calculator", "category": "science", "subcategory": "Chemistry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Buffer pH from pKa and the conjugate base/acid ratio, or solve for the ratio or the pKa, via the Henderson-Hasselbalch equation."}, {"slug": "molar-mass-calculator", "name": "Molar Mass Calculator", "category": "science", "subcategory": "Chemical Calculators", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Molar mass of a chemical formula with per-element atom count, contribution, and percentage composition, supporting nested parentheses."}, {"slug": "freezing-point-depression-calculator", "name": "Freezing Point Depression Calculator", "category": "science", "subcategory": "Chemistry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Freezing point depression (delta-Tf = i * Kf * m) from molality or from solute/solvent mass, with a van't Hoff factor for ionic solutes."}, {"slug": "empirical-formula-calculator", "name": "Empirical Formula Calculator", "category": "science", "subcategory": "Chemical Calculators", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Empirical formula from element mass percentages or masses, with optional molecular formula when a molecular mass is supplied."}, {"slug": "url-parser", "name": "URL Parser", "category": "dev", "subcategory": "Encoding", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Break a URL into scheme, host, port, path, decoded query parameters, and fragment."}, {"slug": "murmurhash3-generator", "name": "MurmurHash3 Generator", "category": "hash", "subcategory": "Checksum", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "32-bit MurmurHash3 (x86) of the input text, in decimal, hex, and binary, with a configurable seed."}, {"slug": "html-to-text-converter", "name": "HTML to Text Converter", "category": "webmaster", "subcategory": "HTML", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Strip HTML tags, scripts, styles, and comments to extract plain text, with tag/script/style/comment counts and a size comparison."}, {"slug": "descartes-rule-of-signs-calculator", "name": "Descartes' Rule of Signs Calculator", "category": "math", "subcategory": "Algebra", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Possible counts of positive and negative real roots of a polynomial via sign changes in f(x) and f(-x), with the full root-count table."}, {"slug": "egyptian-fraction-calculator", "name": "Egyptian Fraction Calculator", "category": "math", "subcategory": "Number Theory", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Express a proper fraction as a sum of distinct unit fractions using the greedy Fibonacci-Sylvester algorithm."}, {"slug": "t-test-calculator", "name": "t-Test Calculator", "category": "math", "subcategory": "Statistics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Run one-sample, paired, or independent two-sample t-tests with Welch or pooled variance, p-value, critical value, confidence interval, and Cohen's d."}, {"slug": "p-value-calculator", "name": "P-Value Calculator", "category": "math", "subcategory": "Statistics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert a z, t, chi-square, or F test statistic into a one- or two-tailed p-value with critical values and significance at common alpha levels."}, {"slug": "confidence-interval-calculator", "name": "Confidence Interval Calculator", "category": "math", "subcategory": "Statistics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Confidence interval for a population mean from raw data or summary statistics, using the t-distribution or the normal distribution."}, {"slug": "fisher-s-exact-test-calculator", "name": "Fisher's Exact Test Calculator", "category": "math", "subcategory": "Statistics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Exact hypergeometric test for a 2x2 table with one- and two-tailed p-values, odds ratio with confidence interval, relative risk, and expected counts."}, {"slug": "contingency-table-calculator", "name": "Contingency Table Calculator", "category": "math", "subcategory": "Statistics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Chi-square test of independence for an r x c contingency table with expected counts, standardized residuals, cell contributions, and Cramer's V."}, {"slug": "adjacency-matrix-calculator", "name": "Adjacency Matrix Calculator", "category": "math", "subcategory": "Graph Theory", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Build an adjacency matrix from an edge list (or read one back), with degrees, density, connected components, symmetry, and walk counts from matrix powers."}, {"slug": "topological-sort-calculator", "name": "Topological Sort Calculator", "category": "math", "subcategory": "Graph Theory", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Topologically order a directed graph with Kahn or DFS, detect cycles, and report layers, sources, sinks, longest path, and the number of valid orderings."}, {"slug": "graph-coloring-calculator", "name": "Graph Coloring Calculator", "category": "math", "subcategory": "Graph Theory", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Colour an undirected graph with greedy, Welsh-Powell, DSATUR, or exact search, reporting colour classes, the chromatic number, bipartiteness, and bounds."}, {"slug": "karnaugh-map-k-map-solver", "name": "Karnaugh Map (K-Map) Solver", "category": "math", "subcategory": "Logic", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Minimise 2-5 variable boolean functions from minterms, maxterms, or a truth table with Quine-McCluskey, returning prime implicants and the Gray-coded K-map grid."}, {"slug": "boolean-algebra-simplifier", "name": "Boolean Algebra Simplifier", "category": "math", "subcategory": "Logic", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Simplify a boolean expression to its minimal sum-of-products or product-of-sums form, with canonical forms, prime implicants, and literal savings."}, {"slug": "json-formatter-validator", "name": "JSON Formatter/Validator", "category": "developer", "subcategory": "Data Formatting", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Validate, beautify, minify, or repair JSON with precise error positions, size savings, nesting depth, and element counts."}, {"slug": "json-to-csv-converter", "name": "JSON to CSV Converter", "category": "dev", "subcategory": "Data Conversion", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Flatten a JSON array into CSV with auto-detected record path, dot or bracket key flattening, configurable delimiter, quoting, and line endings."}, {"slug": "json-schema-generator", "name": "JSON Schema Generator", "category": "developer", "subcategory": "Data Formatting", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Infer a JSON Schema (2020-12, 2019-09, or draft-07) from a sample document, with format detection, enum inference, and required-property control."}, {"slug": "uuid-validator-decoder", "name": "UUID Validator/Decoder", "category": "developer", "subcategory": "Data Validation", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Validate and decode UUIDs: version, variant, field breakdown, v1/v7 timestamps and MAC address, alternate encodings, and v3/v5 namespace verification."}, {"slug": "curl-command-builder", "name": "cURL Command Builder", "category": "developer", "subcategory": "General Tools", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Assemble a shell-safe curl command from method, URL, query parameters, headers, body, and auth, in multi-line, one-line, CMD, or PowerShell style."}, {"slug": "curl-to-json-converter", "name": "cURL to JSON Converter", "category": "developer", "subcategory": "Data Conversion", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Parse a curl command into structured JSON (method, URL parts, headers, cookies, auth, body) and emit equivalent Python, Node.js, PHP, or Go code."}, {"slug": "html-to-markdown-converter", "name": "HTML to Markdown Converter", "category": "webmaster", "subcategory": "HTML", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert HTML into Markdown, handling headings, emphasis, links, images, lists, blockquotes, code blocks, and tables, with script and style content removed."}, {"slug": "markdown-table-generator", "name": "Markdown Table Generator", "category": "text", "subcategory": "Formatting", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Turn delimited rows into a padded Markdown table with auto-detected delimiter, optional header row, and left, center, or right column alignment."}, {"slug": "robots-txt-generator", "name": "Robots.txt Generator", "category": "webmaster", "subcategory": "SEO", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Generate a robots.txt from allow/disallow paths, extra user-agent groups, and sitemaps, or validate an existing file for errors and crawler warnings."}, {"slug": "meta-tag-generator", "name": "Meta Tag Generator", "category": "webmaster", "subcategory": "SEO", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Build SEO, Open Graph, and Twitter Card meta tags with inherited defaults, length checks, and Google, Facebook, and Twitter preview data."}, {"slug": "mortgage-comparison-calculator", "name": "Mortgage Comparison Calculator", "category": "finance", "subcategory": "Mortgage", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Compare two to four fixed-rate mortgages by payment, total interest, total cost, and annual amortization."}, {"slug": "crypto-profit-loss-calculator", "name": "Crypto Profit/Loss Calculator", "category": "finance", "subcategory": "Crypto", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate crypto trade profit, ROI, transaction fees, and break-even price."}, {"slug": "bitcoin-investment-calculator", "name": "Bitcoin Investment Calculator", "category": "finance", "subcategory": "Crypto", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Project Bitcoin holdings, target value, profit, ROI, CAGR, and benchmark values."}, {"slug": "crypto-leverage-calculator", "name": "Crypto Leverage Calculator", "category": "finance", "subcategory": "Crypto", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimate leveraged crypto position size, liquidation price, P/L, ROI, and price scenarios."}, {"slug": "stop-loss-take-profit-calculator", "name": "Stop Loss Take Profit Calculator", "category": "finance", "subcategory": "Trading", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate stop-loss and take-profit levels, risk/reward, and risk-based position size."}, {"slug": "short-selling-profit-calculator", "name": "Short Selling Profit Calculator", "category": "finance", "subcategory": "Trading", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate short-sale net profit after borrow fees, margin interest, and commissions."}, {"slug": "options-profit-calculator", "name": "Options Profit Calculator", "category": "finance", "subcategory": "Options", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate long call or put break-even, maximum risk, expiration P/L, and payoff curve."}, {"slug": "bond-convexity-calculator", "name": "Bond Convexity Calculator", "category": "finance", "subcategory": "Bonds", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate bond price, duration, convexity, and a second-order yield-shock estimate."}, {"slug": "bond-duration-calculator-macaulay-modified", "name": "Bond Duration Calculator", "category": "finance", "subcategory": "Bonds", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate Macaulay and modified duration, DV01, and exact versus estimated repricing."}, {"slug": "espp-calculator", "name": "ESPP Calculator", "category": "finance", "subcategory": "Investing", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimate ESPP shares, lookback discount, sale proceeds, taxes, and after-tax return."}, {"slug": "estate-tax-calculator", "name": "Estate Tax Calculator", "category": "finance", "subcategory": "Tax", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimate federal estate tax from gross estate, deductions, gifts, exemption, and graduated brackets."}, {"slug": "ebay-fee-calculator", "name": "eBay Fee Calculator", "category": "finance", "subcategory": "Ecommerce", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimate eBay final-value, order, promoted, and insertion fees plus net margin and target price."}, {"slug": "amazon-fba-calculator", "name": "Amazon FBA Calculator", "category": "finance", "subcategory": "Ecommerce", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimate Amazon referral, fulfillment, and storage fees from category, dimensions, and weight."}, {"slug": "real-estate-commission-calculator", "name": "Real Estate Commission Calculator", "category": "finance", "subcategory": "Real Estate", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate total real-estate commission, agent split, rate comparisons, and seller net proceeds."}, {"slug": "htaccess-redirect-generator", "name": ".htaccess Redirect Generator", "category": "webmaster", "subcategory": "Redirects", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Generate Apache rules for path redirects, HTTPS, hostname normalization, or IP blocking."}, {"slug": "xml-sitemap-generator", "name": "XML Sitemap Generator", "category": "webmaster", "subcategory": "SEO", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Generate a validated XML sitemap from paths or URLs with lastmod, change frequency, and priority."}, {"slug": "css-grid-generator", "name": "CSS Grid Generator", "category": "developer", "subcategory": "CSS", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Generate responsive or fixed CSS Grid styles and matching HTML markup."}, {"slug": "logic-gate-simulator", "name": "Logic Gate Simulator", "category": "developer", "subcategory": "Logic", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Evaluate Boolean gate expressions and return a truth table, minterms, classification, and gate counts."}, {"slug": "planar-graph-checker", "name": "Planar Graph Checker", "category": "math", "subcategory": "Graph Theory", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Check graph edge bounds and direct K5/K3,3 obstructions, with components and degree data."}, {"slug": "crypto-arbitrage-calculator", "name": "Crypto Arbitrage Calculator", "category": "finance", "subcategory": "Crypto", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimate cross-exchange crypto arbitrage profit after trading, withdrawal, and network fees."}, {"slug": "variance-calculator", "name": "Variance Calculator", "category": "math", "subcategory": "Statistics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate sample and population variance with related statistics."}, {"slug": "standard-deviation-calculator", "name": "Standard Deviation Calculator", "category": "math", "subcategory": "Statistics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate sample and population standard deviation with quartiles."}, {"slug": "sample-variance-calculator", "name": "Sample Variance Calculator", "category": "math", "subcategory": "Statistics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate sample or population variance from a numeric dataset."}, {"slug": "sample-standard-deviation-calculator", "name": "Sample Standard Deviation Calculator", "category": "math", "subcategory": "Statistics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate sample standard deviation and optional z-score outliers."}, {"slug": "population-variance-calculator", "name": "Population Variance Calculator", "category": "math", "subcategory": "Statistics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate population variance and population standard deviation."}, {"slug": "coefficient-of-variation-calculator", "name": "Coefficient of Variation Calculator", "category": "math", "subcategory": "Statistics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate coefficient of variation from sample or population standard deviation."}, {"slug": "five-number-summary-calculator", "name": "Five Number Summary Calculator", "category": "math", "subcategory": "Statistics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate minimum, Q1, median, Q3, maximum, IQR, and outlier fences."}, {"slug": "interquartile-range-calculator", "name": "Interquartile Range Calculator", "category": "math", "subcategory": "Statistics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate IQR, quartiles, and 1.5-IQR outlier fences."}, {"slug": "midrange-calculator", "name": "Midrange Calculator", "category": "math", "subcategory": "Statistics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate the midpoint between the minimum and maximum of a dataset."}, {"slug": "quartile-calculator", "name": "Quartile Calculator", "category": "math", "subcategory": "Statistics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate Q1, Q2, Q3, IQR, and outlier fences using a selected quartile method."}, {"slug": "gradient-calculator-multivariable", "name": "Gradient Calculator (Multivariable)", "category": "math", "subcategory": "Calculus", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Compute the gradient vector of a multivariable function, with optional evaluation, magnitude, and direction at a point."}, {"slug": "divergence-calculator", "name": "Divergence Calculator", "category": "math", "subcategory": "Calculus", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Compute the divergence of a 2D or 3D vector field, with per-term partials and source/sink classification."}, {"slug": "curl-calculator", "name": "Curl Calculator", "category": "math", "subcategory": "Calculus", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Compute the curl of a 3D vector field (or the scalar curl in 2D) with optional evaluation at a point."}, {"slug": "jacobian-matrix-calculator", "name": "Jacobian Matrix Calculator", "category": "math", "subcategory": "Calculus", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Build the Jacobian matrix of a vector-valued function, with the symbolic determinant when it is square."}, {"slug": "directional-derivative-calculator", "name": "Directional Derivative Calculator", "category": "math", "subcategory": "Calculus", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Compute the directional derivative of a function along a direction vector, with the maximum rate of change."}, {"slug": "implicit-derivative-calculator", "name": "Implicit Derivative Calculator", "category": "math", "subcategory": "Calculus", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Differentiate an implicit equation to first, second, or third order using the partial-derivative quotient."}, {"slug": "l-h-pital-s-rule-calculator", "name": "L'Hopital's Rule Calculator", "category": "math", "subcategory": "Calculus", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Resolve 0/0 and infinity/infinity limits by repeated differentiation, showing each application of the rule."}, {"slug": "euler-s-method-calculator", "name": "Euler's Method Calculator", "category": "math", "subcategory": "Calculus", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Step an initial value problem forward with explicit Euler, with a full table and optional exact-solution error."}, {"slug": "double-integral-calculator", "name": "Double Integral Calculator", "category": "math", "subcategory": "Calculus", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Evaluate an iterated double integral over rectangular or variable-limit regions."}, {"slug": "line-integral-calculator", "name": "Line Integral Calculator", "category": "math", "subcategory": "Calculus", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Evaluate scalar or vector line integrals along a parametric curve, with arc length and conservative-field check."}, {"slug": "f-test-f-distribution-calculator", "name": "F-Test / F-Distribution Calculator", "category": "math", "subcategory": "Statistics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Compare two variances with an F test, or turn an F statistic into a p-value and critical values."}, {"slug": "kruskal-wallis-test-calculator", "name": "Kruskal-Wallis Test Calculator", "category": "math", "subcategory": "Statistics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Run the Kruskal-Wallis H test for several independent groups, with tie correction and rank summaries."}, {"slug": "a-b-test-significance-calculator", "name": "A/B Test Significance Calculator", "category": "math", "subcategory": "Statistics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Test whether an A/B conversion-rate difference is significant, with lift, z score, p-value, and intervals."}, {"slug": "a-b-test-sample-size-calculator", "name": "A/B Test Sample Size Calculator", "category": "math", "subcategory": "Statistics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Size an A/B test from baseline rate, minimum detectable effect, significance, and power."}, {"slug": "beta-distribution-calculator", "name": "Beta Distribution Calculator", "category": "math", "subcategory": "Probability", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Beta distribution density, cumulative probability, quantiles, and shape statistics."}, {"slug": "chemical-equation-balancer", "name": "Chemical Equation Balancer", "category": "science", "subcategory": "Chemistry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Balance a chemical equation by solving the element matrix for the smallest whole-number coefficients."}, {"slug": "electron-configuration-calculator", "name": "Electron Configuration Calculator", "category": "science", "subcategory": "Chemistry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Electron configuration of any element or ion, with noble-gas notation, shells, and valence electrons."}, {"slug": "limiting-reactant-calculator", "name": "Limiting Reactant Calculator", "category": "science", "subcategory": "Chemical Calculators", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Find the limiting reactant, theoretical yield, leftover excess, and percent yield from a balanced equation."}, {"slug": "julian-date-converter", "name": "Julian Date Converter", "category": "time-date", "subcategory": "Date Tools", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert between calendar dates and Julian Date, Modified Julian Date, or Unix time."}, {"slug": "decimal-degrees-to-dms-converter", "name": "Decimal Degrees to DMS Converter", "category": "math", "subcategory": "Trigonometry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert decimal degrees to degrees, minutes, and seconds, with hemisphere labels for coordinates."}, {"slug": "arm-mortgage-calculator", "name": "ARM Mortgage Calculator", "category": "finance", "subcategory": "Loans", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Worst-case payment path of an adjustable-rate mortgage under its initial, periodic, and lifetime caps."}, {"slug": "balloon-loan-calculator", "name": "Balloon Loan Calculator", "category": "finance", "subcategory": "Loans", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Monthly payment and final balloon payment for amortized or interest-only balloon loans."}, {"slug": "interest-only-mortgage-calculator", "name": "Interest-Only Mortgage Calculator", "category": "finance", "subcategory": "Loans", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Interest-only payment, the payment jump when the IO period ends, and the extra interest versus a standard loan."}, {"slug": "biweekly-mortgage-payment-calculator", "name": "Biweekly Mortgage Payment Calculator", "category": "finance", "subcategory": "Loans", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Biweekly versus monthly mortgage payments with interest saved and time cut from the term."}, {"slug": "fha-loan-calculator", "name": "FHA Loan Calculator", "category": "finance", "subcategory": "Loans", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "FHA payment with upfront and annual mortgage insurance premiums from the HUD MIP schedule."}, {"slug": "va-loan-calculator", "name": "VA Loan Calculator", "category": "finance", "subcategory": "Loans", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "VA loan payment with the funding fee by use type and down payment, financed or paid at closing."}, {"slug": "mortgage-recast-calculator", "name": "Mortgage Recast Calculator", "category": "finance", "subcategory": "Loans", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "New payment after a lump-sum recast, versus prepaying without recasting."}, {"slug": "home-affordability-calculator", "name": "Home Affordability Calculator", "category": "finance", "subcategory": "Housing", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Maximum home price under the 28/36 rule with the full escrow breakdown and DTI ratios."}, {"slug": "car-affordability-calculator", "name": "Car Affordability Calculator", "category": "finance", "subcategory": "Loans", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Maximum affordable car price under the 20/4/10 rule with the binding constraint identified."}, {"slug": "rent-vs-buy-calculator", "name": "Rent vs Buy Calculator", "category": "finance", "subcategory": "Housing", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Year-by-year wealth comparison of renting and investing versus buying, with the breakeven year."}, {"slug": "file-size-converter", "name": "File Size Converter", "category": "math", "subcategory": "Unit Converters", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert file sizes across decimal (KB, MB) and binary (KiB, MiB) units with an all-unit table."}, {"slug": "data-transfer-rate-converter", "name": "Data Transfer Rate Converter", "category": "math", "subcategory": "Unit Converters", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert bandwidth between bps, Mbps, MB/s and binary variants, with an optional download-time estimate."}, {"slug": "day-of-the-year-calculator", "name": "Day of the Year Calculator", "category": "time-date", "subcategory": "Date Tools", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Day number within the year plus days remaining, year progress, quarter, and ISO week."}, {"slug": "iso-8601-date-formatter", "name": "ISO 8601 Date Formatter", "category": "developer", "subcategory": "Data Formatting", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Render one instant as ISO 8601 extended, basic, week and ordinal dates, RFC 2822, HTTP-date, and Unix time."}, {"slug": "http-status-code-reference", "name": "HTTP Status Code Reference", "category": "developer", "subcategory": "General Tools", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Look up an HTTP status code or browse the registered codes by class with their defining RFCs."}, {"slug": "ascii-table-reference", "name": "ASCII Table Reference", "category": "developer", "subcategory": "General Tools", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Full 7-bit ASCII table in decimal, hex, octal, and binary, with single-character lookup."}, {"slug": "keyword-density-checker", "name": "Keyword Density Checker", "category": "webmaster", "subcategory": "SEO", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "One-, two- and three-word keyword density with stop-word filtering and word counts."}, {"slug": "hreflang-tag-generator", "name": "Hreflang Tag Generator", "category": "webmaster", "subcategory": "SEO", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Generate hreflang link tags, HTTP Link headers, and sitemap XML from language and URL pairs."}, {"slug": "email-extractor", "name": "Email Extractor", "category": "text", "subcategory": "Analysis", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Extract email addresses from text with de-duplication, sorting, and a domain breakdown."}, {"slug": "invisible-character-remover", "name": "Invisible Character Remover", "category": "text", "subcategory": "Cleanup", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Detect, remove, or reveal zero-width and Unicode formatting characters hidden in text."}, {"slug": "laplace-transform-calculator", "name": "Laplace Transform Calculator", "category": "math", "subcategory": "Calculus", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Laplace transform of a sum of powers, exponentials and trigonometric terms, with the region of convergence."}, {"slug": "inverse-laplace-transform-calculator", "name": "Inverse Laplace Transform Calculator", "category": "math", "subcategory": "Calculus", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Invert a proper rational Laplace transform by exact partial fractions, including repeated and complex poles."}, {"slug": "fourier-series-coefficients-calculator", "name": "Fourier Series Coefficients Calculator", "category": "math", "subcategory": "Calculus", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Fourier coefficients a0, a_n and b_n for a function over one period, with amplitude, phase and symmetry detection."}, {"slug": "first-order-ode-solver", "name": "First Order ODE Solver", "category": "math", "subcategory": "Calculus", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Classify and solve y' = f(x, y): closed form for constant-coefficient linear equations plus an RK4 solution table and slope field."}, {"slug": "second-order-ode-solver", "name": "Second Order ODE Solver", "category": "math", "subcategory": "Calculus", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Solve a\u00b7y'' + b\u00b7y' + c\u00b7y = 0 from the characteristic equation, with the initial-value constants and damping ratio."}, {"slug": "bernoulli-ode-solver", "name": "Bernoulli ODE Solver", "category": "math", "subcategory": "Calculus", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Solve y' + p\u00b7y = q\u00b7y^n by the v = y^(1-n) substitution, with the linearised form and an RK4 cross-check."}, {"slug": "matrix-diagonalization-calculator", "name": "Matrix Diagonalization Calculator", "category": "math", "subcategory": "Linear Algebra", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Diagonalise a 2x2 to 4x4 matrix as A = P\u00b7D\u00b7P-inverse in exact rational arithmetic, reporting defective matrices."}, {"slug": "matrix-exponential-calculator", "name": "Matrix Exponential Calculator", "category": "math", "subcategory": "Linear Algebra", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Compute e^(At) by scaling and squaring with a Taylor series, checked against det(e^At) = e^(trace(A)t)."}, {"slug": "jordan-normal-form-calculator", "name": "Jordan Normal Form Calculator", "category": "math", "subcategory": "Linear Algebra", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Jordan normal form of a matrix with rational eigenvalues, with block sizes from the nullities of (A-lambda I)^k."}, {"slug": "linear-programming-solver", "name": "Linear Programming Solver", "category": "math", "subcategory": "Algebra", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Solve a linear program by two-phase simplex in exact rational arithmetic, with slacks and binding constraints."}, {"slug": "hijri-calendar-converter", "name": "Hijri Calendar Converter", "category": "time-date", "subcategory": "Calendar", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert between Gregorian and Hijri (Islamic) dates with month names, sacred-month and leap-year flags."}, {"slug": "hebrew-calendar-converter", "name": "Hebrew Calendar Converter", "category": "time-date", "subcategory": "Calendar", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert between Gregorian and Hebrew dates, including leap months, year kind and month lengths."}, {"slug": "fast-fourier-transform-fft-calculator", "name": "Fast Fourier Transform (FFT) Calculator", "category": "math", "subcategory": "Calculus", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Discrete Fourier transform of a sample list by radix-2 FFT, with magnitude, phase and the dominant frequency."}, {"slug": "html-beautifier", "name": "HTML Beautifier", "category": "webmaster", "subcategory": "HTML", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Indent and align HTML, or minify it, preserving the contents of pre, script, style and textarea."}, {"slug": "sql-formatter", "name": "SQL Formatter", "category": "developer", "subcategory": "Data Formatting", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Format or minify SQL with keyword casing, breaking clauses and joins onto their own lines."}, {"slug": "json-to-yaml-converter", "name": "JSON to YAML Converter", "category": "developer", "subcategory": "Data Conversion", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert a JSON document into block-style YAML, quoting only the scalars that need it."}, {"slug": "treasury-inflation-protected-securities-tips-calculator", "name": "Treasury Inflation-Protected Securities (TIPS) Calculator", "category": "finance", "subcategory": "Bonds", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Inflation-adjusted principal, growing coupons and the deflation floor for a TIPS holding."}, {"slug": "tax-equivalent-yield-calculator", "name": "Tax-Equivalent Yield Calculator", "category": "finance", "subcategory": "Return", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Tax-equivalent yield of a municipal bond from federal and state marginal rates, with a bracket table."}, {"slug": "forward-rate-calculator", "name": "Forward Rate Calculator", "category": "finance", "subcategory": "Interest", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Implied forward rates from a spot curve, as a full matrix plus the consecutive forward curve and shape diagnosis."}, {"slug": "exponential-integral-calculator", "name": "Exponential Integral Calculator", "category": "math", "subcategory": "Special Functions", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Evaluate E1(x), Ei(x), the generalised E_n(x) and the logarithmic integral li(x)."}, {"slug": "battery-series-parallel-calculator", "name": "Battery Series/Parallel Calculator", "category": "miscellaneous", "subcategory": "Electronics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate battery-pack voltage, capacity, energy, resistance, discharge current and runtime from an S/P layout."}, {"slug": "bend-allowance-calculator", "name": "Bend Allowance Calculator", "category": "miscellaneous", "subcategory": "Construction", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate sheet-metal bend allowance, setback, deduction and flat-pattern length."}, {"slug": "engine-displacement-calculator", "name": "Engine Displacement Calculator", "category": "miscellaneous", "subcategory": "Automotive", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate total and per-cylinder engine displacement from bore, stroke and cylinder count."}, {"slug": "kva-calculator", "name": "kVA Calculator", "category": "miscellaneous", "subcategory": "Electronics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Solve kVA, kW, kVAR, volts or amps for DC, single-phase and three-phase systems."}, {"slug": "mah-to-wh-converter", "name": "mAh to Wh Converter", "category": "math", "subcategory": "Unit Converters", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert battery capacity and energy among mAh, Ah and Wh using nominal voltage."}, {"slug": "mechanical-advantage-calculator", "name": "Mechanical Advantage Calculator", "category": "miscellaneous", "subcategory": "Physics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate ideal and efficiency-adjusted mechanical advantage for levers, pulleys, ramps and gears."}, {"slug": "rc-low-pass-filter-calculator", "name": "RC Low-Pass Filter Calculator", "category": "miscellaneous", "subcategory": "Electronics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate RC low-pass cutoff, time constant, gain, attenuation and phase at a selected frequency."}, {"slug": "resistors-in-series-calculator", "name": "Resistors in Series Calculator", "category": "miscellaneous", "subcategory": "Electronics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Add up to 200 series resistors and report each resistor's voltage-divider share."}, {"slug": "series-parallel-capacitor-calculator", "name": "Series/Parallel Capacitor Calculator", "category": "miscellaneous", "subcategory": "Electronics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate equivalent capacitance for a list of capacitors connected in series or parallel."}, {"slug": "watts-to-amps-calculator", "name": "Watts to Amps Calculator", "category": "miscellaneous", "subcategory": "Electronics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert watts to amps for DC, single-phase AC or three-phase AC systems."}, {"slug": "billable-utilization-calculator", "name": "Billable Utilization Calculator", "category": "business", "subcategory": "Operations", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate billable utilization, target gap, revenue and gross margin for a work period."}, {"slug": "bradford-factor-calculator", "name": "Bradford Factor Calculator", "category": "business", "subcategory": "Human Resources", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate an attendance Bradford Factor from absence spells and total absent days."}, {"slug": "csat-score-calculator", "name": "CSAT Score Calculator", "category": "business", "subcategory": "Customer Experience", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate customer satisfaction percentage, average rating and rating distribution from 1\u20135 response counts."}, {"slug": "employee-turnover-rate-calculator", "name": "Employee Turnover Rate Calculator", "category": "business", "subcategory": "Human Resources", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate period and annualized employee turnover from average headcount and separations."}, {"slug": "fte-calculator", "name": "FTE Calculator", "category": "business", "subcategory": "Human Resources", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert full-time and part-time headcount and hours into full-time equivalents."}, {"slug": "mtbf-mttr-calculator", "name": "MTBF & MTTR Calculator", "category": "business", "subcategory": "Reliability", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate MTBF, MTTR, availability and failure rate from operational totals or direct metrics."}, {"slug": "survey-response-rate-calculator", "name": "Survey Response Rate Calculator", "category": "business", "subcategory": "Research", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate complete and overall survey response rates, completion rate and approximate margin of error."}, {"slug": "follower-growth-rate-calculator", "name": "Follower Growth Rate Calculator", "category": "business", "subcategory": "Social Media", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Measure absolute, percentage, compound and annualized follower growth and estimate time to a goal."}, {"slug": "compa-ratio-calculator", "name": "Compa-Ratio Calculator", "category": "business", "subcategory": "Human Resources", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Compare salary with a pay-range midpoint and calculate range penetration."}, {"slug": "coffee-ratio-by-cups-calculator", "name": "Coffee Ratio by Cups Calculator", "category": "food", "subcategory": "Coffee", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate coffee and water amounts by cup count using standard, strong, light or custom brew ratios."}, {"slug": "square-feet-to-square-meters", "name": "Square Feet to Square Meters Converter", "category": "conversion", "subcategory": "Area", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert square feet and square meters with exact international-foot conversion."}, {"slug": "cubic-feet-to-cubic-yards", "name": "Cubic Feet to Cubic Yards Converter", "category": "conversion", "subcategory": "Volume", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert cubic feet and cubic yards and optionally add material waste and order rounding."}, {"slug": "knots-to-mph-converter", "name": "Knots to MPH Converter", "category": "conversion", "subcategory": "Speed", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert speed between nautical knots and miles per hour."}, {"slug": "mph-to-kmh-kmh-to-mph", "name": "MPH to KMH Converter", "category": "conversion", "subcategory": "Speed", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert miles per hour and kilometers per hour in either direction."}, {"slug": "cm-to-feet-and-inches-converter", "name": "Centimeters to Feet and Inches Converter", "category": "conversion", "subcategory": "Length", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert centimeters to normalized feet and inches, or convert feet and inches to centimeters."}, {"slug": "psi-to-bar-converter", "name": "PSI to Bar Converter", "category": "conversion", "subcategory": "Pressure", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert pressure between pounds per square inch and bar."}, {"slug": "temperature-converter", "name": "Temperature Converter", "category": "conversion", "subcategory": "Temperature", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert temperatures among Celsius, Fahrenheit and Kelvin."}, {"slug": "speed-converter", "name": "Speed Converter", "category": "conversion", "subcategory": "Speed", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert speed among meters per second, kilometers per hour, miles per hour, knots and feet per second."}, {"slug": "pressure-converter", "name": "Pressure Converter", "category": "conversion", "subcategory": "Pressure", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert pressure among pascals, kilopascals, megapascals, bar, PSI and standard atmospheres."}, {"slug": "shoe-size-converter", "name": "Shoe Size Converter", "category": "conversion", "subcategory": "Size", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimate equivalent shoe sizes across US men's, US women's, UK, EU and centimeter systems."}, {"slug": "volume-of-sphere-calculator", "name": "Volume of a Sphere Calculator", "category": "geometry", "subcategory": "Volume", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate the volume, surface area and diameter of a sphere from its radius."}, {"slug": "surface-area-of-sphere-calculator", "name": "Surface Area of a Sphere Calculator", "category": "geometry", "subcategory": "Surface Area", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate the surface area, volume and diameter of a sphere from its radius."}, {"slug": "surface-area-calculator", "name": "Surface Area Calculator", "category": "geometry", "subcategory": "Surface Area", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate the surface area of spheres, cylinders, cuboids and cones."}, {"slug": "volume-calculator", "name": "Volume Calculator", "category": "geometry", "subcategory": "Volume", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate the volume of spheres, cylinders, cuboids, cones and rectangular pyramids."}, {"slug": "lbs-to-kg-converter", "name": "Pounds to Kilograms Converter", "category": "conversion", "subcategory": "Weight", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert mass between pounds and kilograms using the international avoirdupois pound."}, {"slug": "quarts-to-cups-converter", "name": "Quarts to Cups Converter", "category": "conversion", "subcategory": "Cooking", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert US customary quarts and cups in either direction."}, {"slug": "sales-tax-calculator", "name": "Sales Tax Calculator", "category": "finance", "subcategory": "Tax", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate sales tax, tax-inclusive totals, pre-tax prices or an implied tax rate."}, {"slug": "percentage-increase-calculator", "name": "Percentage Increase Calculator", "category": "math", "subcategory": "Percentage", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate the absolute and percentage increase or decrease between two positive values."}, {"slug": "sort-numbers", "name": "Sort Numbers", "category": "text", "subcategory": "Number Lists", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Sort up to 1000 numbers and optionally remove duplicates while returning basic statistics."}, {"slug": "number-extractor", "name": "Number Extractor", "category": "text", "subcategory": "Extraction", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Extract decimal or integer values from text and return the values with simple statistics."}, {"slug": "catalan-number-generator", "name": "Catalan Number Generator", "category": "math", "subcategory": "Sequence Tools", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate the nth Catalan number and nearby sequence values."}, {"slug": "collatz-conjecture-calculator", "name": "Collatz Conjecture Calculator", "category": "math", "subcategory": "Sequence Tools", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Generate and analyze the deterministic Collatz hailstone sequence."}, {"slug": "euler-characteristic-calculator", "name": "Euler Characteristic Calculator", "category": "math", "subcategory": "Geometry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate Euler characteristic V - E + F and classify common surfaces."}, {"slug": "ellipse-circumference-calculator", "name": "Ellipse Circumference Calculator", "category": "math", "subcategory": "Geometry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate ellipse circumference with several common approximations."}, {"slug": "conic-section-identifier", "name": "Conic Section Identifier", "category": "math", "subcategory": "Geometry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Classify a general second-degree equation as a conic section."}, {"slug": "completing-the-square-calculator", "name": "Completing the Square Calculator", "category": "math", "subcategory": "Algebra", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert a quadratic to vertex form and solve by completing the square."}, {"slug": "circumscribed-circle-circumcircle-calculator", "name": "Circumscribed Circle Circumcircle Calculator", "category": "math", "subcategory": "Geometry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate the circumcircle of a triangle from side lengths or coordinates."}, {"slug": "coordinate-geometry-distance-calculator", "name": "Coordinate Geometry Distance Calculator", "category": "math", "subcategory": "Geometry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate distance, midpoint, slope, and line equations between two points."}, {"slug": "cone-flat-pattern-template-generator", "name": "Cone Flat Pattern Template Generator", "category": "math", "subcategory": "Geometry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate unrolled cone or frustum flat-pattern dimensions."}, {"slug": "binomial-probability-distribution-calculator", "name": "Binomial Probability Distribution Calculator", "category": "math", "subcategory": "Probability", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate exact and cumulative binomial probabilities."}, {"slug": "random-name-picker", "name": "Random Name Picker", "category": "random", "subcategory": "Lists", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Draw one or more random names from a list, optionally removing each name once picked."}, {"slug": "random-picker", "name": "Random Picker", "category": "random", "subcategory": "Lists", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Pick random items from any newline-separated list."}, {"slug": "leap-years-list", "name": "Leap Years List", "category": "time-date", "subcategory": "Calendars", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "List every leap year in a range using the Gregorian rule."}, {"slug": "slope-and-grade-calculator", "name": "Slope and Grade Calculator", "category": "math", "subcategory": "Geometry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert rise and run into slope, grade percentage and angle."}, {"slug": "steps-to-distance-calculator", "name": "Steps to Distance Calculator", "category": "health", "subcategory": "Fitness", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimate distance walked or run from a step count and height."}, {"slug": "fps-converter", "name": "FPS Converter", "category": "conversion", "subcategory": "Media", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert between frame counts, duration and timecode at a given frame rate."}, {"slug": "what-is-my-zodiac-sign", "name": "What Is My Zodiac Sign", "category": "lifestyle", "subcategory": "Astrology", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Return the western zodiac sign, element and modality for a birth date."}, {"slug": "multiplication-calculator", "name": "Multiplication Calculator", "category": "math", "subcategory": "Arithmetic", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Multiply a list of numbers exactly, without floating-point drift."}, {"slug": "gestational-age-calculator", "name": "Gestational Age Calculator", "category": "health", "subcategory": "Pregnancy", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Work out gestational age in weeks and days plus the estimated due date."}, {"slug": "invisible-text-generator", "name": "Invisible Text Generator", "category": "text", "subcategory": "Unicode", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Generate a run of zero-width or blank Unicode characters."}, {"slug": "love-compatibility-calculator", "name": "Love Compatibility Calculator", "category": "lifestyle", "subcategory": "Fun", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Deterministic name-based compatibility score, for entertainment."}, {"slug": "numerology-calculator", "name": "Numerology Calculator", "category": "lifestyle", "subcategory": "Numerology", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Life path, expression and soul urge numbers from a birth date and name."}, {"slug": "what-is-my-lucky-number", "name": "What Is My Lucky Number", "category": "lifestyle", "subcategory": "Numerology", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Derive a lucky number deterministically from a birth date."}, {"slug": "how-long-ago-calculator", "name": "How Long Ago Calculator", "category": "time-date", "subcategory": "Differences", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Express the gap between a date and today in years, months, weeks and days."}, {"slug": "color-inverter", "name": "Color Inverter", "category": "developer", "subcategory": "Color", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Invert a hex colour and report luminance plus a readable text colour."}, {"slug": "scientific-notation-calculator", "name": "Scientific Notation Calculator", "category": "math", "subcategory": "Numbers", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert a number into scientific, E and engineering notation."}, {"slug": "text-formatter", "name": "Text Formatter", "category": "text", "subcategory": "Formatting", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Apply case and whitespace transforms to a block of text."}, {"slug": "number-pattern-finder", "name": "Number Pattern Finder", "category": "math", "subcategory": "Sequences", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Detect arithmetic, geometric or quadratic patterns and predict the next value."}, {"slug": "caffeine-overdose-calculator", "name": "Caffeine Limit Calculator", "category": "health", "subcategory": "Nutrition", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimate a safe daily caffeine limit and what it equals in drinks."}, {"slug": "bun-to-creatinine-ratio-calculator", "name": "BUN to Creatinine Ratio Calculator", "category": "health", "subcategory": "Lab Values", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate the BUN to creatinine ratio with unit conversion and reference range."}, {"slug": "at-bats-per-home-run-calculator", "name": "At Bats per Home Run Calculator", "category": "sports", "subcategory": "Baseball", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate baseball at-bats per home run ratio and home run rate."}, {"slug": "era-calculator", "name": "ERA Calculator", "category": "sports", "subcategory": "Baseball", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate baseball earned run average."}, {"slug": "field-goal-percentage-calculator", "name": "Field Goal Percentage Calculator", "category": "sports", "subcategory": "Basketball", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate made-shot percentage and related shooting metrics."}, {"slug": "ops-calculator", "name": "OPS Calculator", "category": "sports", "subcategory": "Baseball", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate baseball on-base plus slugging with OBP and SLG components."}, {"slug": "slugging-percentage-calculator", "name": "Slugging Percentage Calculator", "category": "sports", "subcategory": "Baseball", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate baseball slugging percentage from hit types."}, {"slug": "efg-calculator", "name": "Effective Field Goal Percentage Calculator", "category": "sports", "subcategory": "Basketball", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate basketball effective field goal percentage."}, {"slug": "fip-calculator", "name": "FIP Calculator", "category": "sports", "subcategory": "Baseball", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate baseball fielding independent pitching."}, {"slug": "rebound-rate-calculator", "name": "Rebound Rate Calculator", "category": "sports", "subcategory": "Basketball", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate basketball offensive, defensive, and total rebound rates."}, {"slug": "total-bases-calculator", "name": "Total Bases Calculator", "category": "sports", "subcategory": "Baseball", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate baseball total bases from singles, doubles, triples, and home runs."}, {"slug": "true-shooting-percentage-calculator", "name": "True Shooting Percentage Calculator", "category": "sports", "subcategory": "Basketball", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate basketball true shooting percentage from points, FGA, and FTA."}, {"slug": "bike-gear-ratio-calculator", "name": "Bike Gear Ratio Calculator", "category": "math", "subcategory": "Sports", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate bicycle gear ratio, gear inches, rollout, gain ratio, and speed."}, {"slug": "cricket-run-rate-calculator", "name": "Cricket Run Rate Calculator", "category": "math", "subcategory": "Sports", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate current, projected, and required cricket run rates from cricket over notation."}, {"slug": "dps-calculator", "name": "DPS Calculator", "category": "math", "subcategory": "Games", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate raw, sustained, critical-hit, and headshot damage per second."}, {"slug": "horsepower-calculator", "name": "Horsepower Calculator", "category": "math", "subcategory": "Physics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Solve horsepower, torque, or RPM and return common power conversions."}, {"slug": "led-resistor-calculator", "name": "LED Resistor Calculator", "category": "math", "subcategory": "Electronics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate LED current-limiting resistor values and power ratings."}, {"slug": "flooring-calculator", "name": "Flooring Calculator", "category": "math", "subcategory": "Construction", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimate flooring material units, waste allowance, and optional cost."}, {"slug": "aquarium-substrate-calculator", "name": "Aquarium Substrate Calculator", "category": "math", "subcategory": "Home", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimate aquarium substrate volume, weight, and bag counts."}, {"slug": "insulation-calculator", "name": "Insulation Calculator", "category": "math", "subcategory": "Construction", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimate insulation R-value target, thickness, material quantity, and cost range."}, {"slug": "ip-address-to-binary-converter", "name": "IP Address to Binary Converter", "category": "webmaster", "subcategory": "IP", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert IPv4 or IPv6 addresses to padded binary forms."}, {"slug": "json-string-escape-unescape", "name": "JSON String Escape/Unescape", "category": "webmaster", "subcategory": "Encoding", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Escape or unescape JSON string content deterministically."}, {"slug": "simple-interest-calculator", "name": "Simple Interest Calculator", "category": "finance", "subcategory": "Interest", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Simple-interest formula: I = P * r * t."}, {"slug": "compound-interest-calculator", "name": "Compound Interest Calculator", "category": "finance", "subcategory": "Interest", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Compound-interest formula with selectable compounding frequency."}, {"slug": "mortgage-calculator", "name": "Mortgage Calculator", "category": "finance", "subcategory": "Loans", "version": "2026-04-22", "credit_weight": 5, "methods": ["POST"], "tier_access": ["pro", "business", "scale"], "summary": "Monthly payment, total interest, LTV, and optional amortization schedule."}, {"slug": "gross-profit-margin-calculator", "name": "Gross Profit Margin Calculator", "category": "finance", "subcategory": "Profitability", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Calculate gross profit, gross margin, markup, and cost ratio."}, {"slug": "net-profit-margin-calculator", "name": "Net Profit Margin Calculator", "category": "finance", "subcategory": "Profitability", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Calculate net profit margin and profit per revenue dollar."}, {"slug": "operating-margin-calculator", "name": "Operating Margin Calculator", "category": "finance", "subcategory": "Profitability", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Calculate operating margin from operating income or detailed operating components."}, {"slug": "ebit-margin-calculator", "name": "EBIT Margin Calculator", "category": "finance", "subcategory": "Profitability", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Calculate EBIT margin and EBIT-to-revenue ratio."}, {"slug": "ebitda-margin-calculator", "name": "EBITDA Margin Calculator", "category": "finance", "subcategory": "Profitability", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Calculate EBITDA margin from direct EBITDA or component inputs."}, {"slug": "profit-calculator", "name": "Profit Calculator", "category": "finance", "subcategory": "Profitability", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Solve profit, margin, markup, revenue, or cost from the known values."}, {"slug": "profit-to-sales-ratio-calculator", "name": "Profit to Sales Ratio Calculator", "category": "finance", "subcategory": "Profitability", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Calculate profit-to-sales ratio and compare it with an industry benchmark."}, {"slug": "return-on-sales-calculator", "name": "Return On Sales Calculator", "category": "finance", "subcategory": "Profitability", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Calculate return on sales, operating cost ratio, and ROS decimal."}, {"slug": "quick-ratio-calculator", "name": "Quick Ratio Calculator", "category": "finance", "subcategory": "Liquidity", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Calculate quick ratio, quick assets, current ratio, and liquidity rating."}, {"slug": "debt-to-income-ratio-calculator", "name": "Debt to Income Ratio Calculator", "category": "finance", "subcategory": "Debt", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Calculate debt-to-income ratio from monthly income and debt payments."}, {"slug": "average-collection-period-calculator", "name": "Average Collection Period Calculator", "category": "finance", "subcategory": "Efficiency", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Calculate average collection period, receivables turnover, and industry benchmark spread."}, {"slug": "capital-employed-calculator", "name": "Capital Employed Calculator", "category": "finance", "subcategory": "Investment", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Calculate capital employed by common balance-sheet methods and optional ROCE."}, {"slug": "capitalization-rate-calculator", "name": "Capitalization Rate Calculator", "category": "finance", "subcategory": "Real Estate", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Solve cap rate, property value, or required NOI for real estate income analysis."}, {"slug": "commission-calculator", "name": "Commission Calculator", "category": "finance", "subcategory": "Sales", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Calculate flat, tiered, or bonus-based sales commission."}, {"slug": "fixed-asset-turnover-calculator", "name": "Fixed Asset Turnover Calculator", "category": "finance", "subcategory": "Efficiency", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Measure revenue generated per dollar of net fixed assets."}, {"slug": "receivables-turnover-ratio-calculator", "name": "Receivables Turnover Ratio Calculator", "category": "finance", "subcategory": "Efficiency", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Calculate receivables turnover and days sales outstanding."}, {"slug": "total-asset-turnover-calculator", "name": "Total Asset Turnover Calculator", "category": "finance", "subcategory": "Efficiency", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Measure revenue generated per dollar of average total assets."}, {"slug": "cash-ratio-calculator", "name": "Cash Ratio Calculator", "category": "finance", "subcategory": "Liquidity", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Calculate cash ratio from cash, marketable securities, and current liabilities."}, {"slug": "debt-to-asset-ratio-calculator", "name": "Debt to Asset Ratio Calculator", "category": "finance", "subcategory": "Leverage", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Calculate debt-to-asset ratio, equity ratio, and optional industry benchmark spread."}, {"slug": "debt-to-equity-ratio-calculator", "name": "Debt to Equity Ratio Calculator", "category": "finance", "subcategory": "Leverage", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Calculate debt-to-equity ratio, equity multiplier, and capital structure shares."}, {"slug": "times-interest-earned-ratio-calculator", "name": "Times Interest Earned Ratio Calculator", "category": "finance", "subcategory": "Debt", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Calculate times interest earned ratio and interest coverage safety margin."}, {"slug": "interest-coverage-ratio-calculator", "name": "Interest Coverage Ratio Calculator", "category": "finance", "subcategory": "Debt", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Calculate EBIT or EBITDA based interest coverage ratio."}, {"slug": "book-value-per-share-calculator", "name": "Book Value per Share Calculator", "category": "finance", "subcategory": "Valuation", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Calculate book value per share, common equity, and optional price-to-book ratio."}, {"slug": "cash-flow-margin-calculator", "name": "Cash Flow Margin Calculator", "category": "finance", "subcategory": "Profitability", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Calculate operating cash flow margin as a percentage of net sales."}, {"slug": "current-ratio-calculator", "name": "Current Ratio Calculator", "category": "finance", "subcategory": "Liquidity", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Calculate current ratio and working capital from current assets and liabilities."}, {"slug": "dividend-payout-ratio-calculator", "name": "Dividend Payout Ratio Calculator", "category": "finance", "subcategory": "Return", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Calculate dividend payout ratio and retention ratio from total or per-share inputs."}, {"slug": "dividend-yield-calculator", "name": "Dividend Yield Calculator", "category": "finance", "subcategory": "Return", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Calculate dividend yield, per-payment dividend, and optional annual income."}, {"slug": "earnings-per-share-calculator", "name": "Earnings per Share Calculator", "category": "finance", "subcategory": "Profitability", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Calculate basic, diluted, or weighted earnings per share."}, {"slug": "equity-ratio-calculator", "name": "Equity Ratio Calculator", "category": "finance", "subcategory": "Leverage", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Calculate equity ratio, debt ratio, equity multiplier, and industry benchmark spread."}, {"slug": "inventory-turnover-calculator", "name": "Inventory Turnover Calculator", "category": "finance", "subcategory": "Efficiency", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Calculate inventory turnover, days sales in inventory, and annualized turnover."}, {"slug": "apr-calculator", "name": "APR Calculator", "category": "finance", "subcategory": "Interest", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Calculate true APR from loan amount, rolled-in fees, nominal rate, and term."}, {"slug": "auto-loan-calculator", "name": "Auto Loan Calculator", "category": "finance", "subcategory": "Loans", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Calculate auto loan amount, monthly payment, tax, and total interest."}, {"slug": "business-loan-calculator", "name": "Business Loan Calculator", "category": "finance", "subcategory": "Loans", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Estimate business loan payments, fees, payoff time, and interest."}, {"slug": "car-loan-payoff-calculator", "name": "Car Loan Payoff Calculator", "category": "finance", "subcategory": "Loans", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Compare standard and accelerated payoff for a car loan."}, {"slug": "credit-card-interest-calculator", "name": "Credit Card Interest Calculator", "category": "finance", "subcategory": "Credit", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Estimate credit card payoff time, interest cost, and payment strategy savings."}, {"slug": "interest-rate-calculator", "name": "Interest Rate Calculator", "category": "finance", "subcategory": "Interest", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Solve the implied annual interest rate from principal, term, and monthly payment."}, {"slug": "nominal-interest-rate-calculator", "name": "Nominal Interest Rate Calculator", "category": "finance", "subcategory": "Interest", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Convert an effective annual rate to a nominal annual rate."}, {"slug": "loan-payoff-calculator", "name": "Loan Payoff Calculator", "category": "finance", "subcategory": "Loans", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Calculate loan payoff months and savings from extra monthly payments."}, {"slug": "personal-loan-calculator", "name": "Personal Loan Calculator", "category": "finance", "subcategory": "Loans", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Calculate personal loan payment, payoff time, interest, and extra-payment savings."}, {"slug": "moving-cost-estimator", "name": "Moving Cost Estimator", "category": "finance", "subcategory": "Real Estate", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Estimate moving costs from home size, distance, service level, and access factors."}, {"slug": "roas-calculator", "name": "ROAS Calculator", "category": "finance", "subcategory": "Marketing", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Calculate return on ad spend, profit, ROI, or target revenue."}, {"slug": "value-of-a-visitor-calculator", "name": "Value of A Visitor Calculator", "category": "webmaster", "subcategory": "Analytics", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Calculate website visitor value, conversion rate, annualized revenue, and traffic ROI."}, {"slug": "usage-rate-calculator", "name": "Usage Rate Calculator", "category": "math", "subcategory": "Sports", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate basketball usage rate from player and team shot, free throw, turnover, and minute stats."}, {"slug": "vat-calculator", "name": "VAT Calculator", "category": "finance", "subcategory": "Tax", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Add, remove, or extract VAT from an amount using a preset or custom rate."}, {"slug": "hourly-to-salary-calculator", "name": "Hourly to Salary Calculator", "category": "finance", "subcategory": "Salary", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Convert an hourly wage to weekly, monthly, and annual salary."}, {"slug": "salary-conversion-calculator", "name": "Salary Conversion Calculator", "category": "finance", "subcategory": "Salary", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Convert wage amounts across hourly, daily, weekly, monthly, and annual pay periods."}, {"slug": "weekly-wage-calculator", "name": "Weekly Wage Calculator", "category": "finance", "subcategory": "Salary", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Convert annual salary to weekly wage."}, {"slug": "hourly-wage-calculator", "name": "Hourly Wage Calculator", "category": "finance", "subcategory": "Salary", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Convert annual salary to equivalent hourly wage."}, {"slug": "down-payment-calculator", "name": "Down Payment Calculator", "category": "finance", "subcategory": "Loans", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Estimate mortgage down payment, loan amount, monthly payment, PMI, and comparison scenarios."}, {"slug": "zero-coupon-bond-calculator", "name": "Zero Coupon Bond Calculator", "category": "finance", "subcategory": "Bonds", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Calculate zero coupon bond price or yield to maturity."}, {"slug": "debt-coverage-ratio-calculator", "name": "Debt Coverage Ratio Calculator", "category": "finance", "subcategory": "Debt", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Calculate debt service coverage ratio from NOI and debt service, or build NOI from property inputs."}, {"slug": "fixed-charge-coverage-ratio-calculator", "name": "Fixed Charge Coverage Ratio Calculator", "category": "finance", "subcategory": "Debt", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Calculate fixed charge coverage ratio with optional EBITDA and principal-payment adjustments."}, {"slug": "loan-to-deposit-ratio-calculator", "name": "Loan to Deposit Ratio Calculator", "category": "finance", "subcategory": "Liquidity", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Calculate bank loan-to-deposit ratio, deposit coverage, and liquidity status."}, {"slug": "goodwill-to-assets-ratio-calculator", "name": "Goodwill to Assets Ratio Calculator", "category": "finance", "subcategory": "Financial Ratio", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Calculate goodwill-to-assets ratio and tangible asset share."}, {"slug": "p-e-ratio-calculator", "name": "P/E Ratio Calculator", "category": "finance", "subcategory": "Valuation", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Calculate price-to-earnings ratio, earnings yield, and sector benchmark premium."}, {"slug": "price-to-book-ratio-calculator", "name": "Price to Book Ratio Calculator", "category": "finance", "subcategory": "Valuation", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Calculate price-to-book ratio and compare it to industry benchmark ranges."}, {"slug": "retention-ratio-calculator", "name": "Retention Ratio Calculator", "category": "finance", "subcategory": "Financial Ratio", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Calculate retention ratio, payout ratio, and retained earnings."}, {"slug": "return-on-assets-ratio-calculator", "name": "Return on Assets Ratio Calculator", "category": "finance", "subcategory": "Profitability", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Calculate ROA with optional DuPont margin and asset-turnover breakdown."}, {"slug": "return-on-equity-calculator", "name": "Return On Equity Calculator", "category": "finance", "subcategory": "Profitability", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Calculate ROE with optional 3- or 5-component DuPont analysis."}, {"slug": "roi-calculator", "name": "ROI Calculator", "category": "finance", "subcategory": "Return", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Calculate ROI, annualized ROI, CAGR, and investment term from fixed dates."}, {"slug": "amortization-calculator", "name": "Amortization Calculator", "category": "finance", "subcategory": "Loan Calculators", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate loan payment, interest, payoff timing, and savings from extra monthly principal."}, {"slug": "credit-card-payment-calculator", "name": "Credit Card Payment Calculator", "category": "finance", "subcategory": "Credit Card Calculators", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate the fixed monthly payment needed to pay off a credit card balance over a chosen number of months."}, {"slug": "credit-card-payoff-calculator", "name": "Credit Card Payoff Calculator", "category": "finance", "subcategory": "Credit Card Calculators", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimate how long a credit card payoff plan will take and how much interest it costs."}, {"slug": "cash-on-cash-return-calculator", "name": "Cash-on-Cash Return Calculator", "category": "finance", "subcategory": "Real Estate Calculators", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimate rental property cash-on-cash return, cap rate, NOI, cash flow, and DSCR."}, {"slug": "debt-payoff-calculator", "name": "Debt Payoff Calculator", "category": "finance", "subcategory": "Debt Calculators", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Compare debt snowball and avalanche payoff strategies for a small list of debts."}, {"slug": "electricity-calculator", "name": "Electricity Calculator", "category": "science", "subcategory": "Physics Calculators", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Solve voltage, current, resistance, and power from any two known Ohm's law values."}, {"slug": "house-flipping-profit-calculator", "name": "House Flipping Profit Calculator", "category": "finance", "subcategory": "Real Estate Calculators", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimate house flip net profit, ROI, financing effects, and the 70 percent rule threshold."}, {"slug": "housing-appreciation-calculator", "name": "Housing Appreciation Calculator", "category": "finance", "subcategory": "Real Estate Calculators", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate total home value change, annualized appreciation, and a future value projection."}, {"slug": "brrrr-method-calculator", "name": "BRRRR Method Calculator", "category": "finance", "subcategory": "Real Estate Calculators", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Analyze a BRRRR real estate deal, including all-in cost, refinance proceeds, capital recycled, equity, and cash flow."}, {"slug": "heloc-calculator", "name": "HELOC Calculator", "category": "finance", "subcategory": "Loan Calculators", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimate HELOC draw-period and repayment-period payments, interest cost, and combined loan-to-value."}, {"slug": "wacc-calculator", "name": "WACC Calculator", "category": "finance", "subcategory": "Investment", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate weighted average cost of capital and component contributions."}, {"slug": "war-calculator", "name": "WAR Calculator", "category": "sports", "subcategory": "Baseball", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimate simplified baseball WAR for position players or pitchers."}, {"slug": "water-usage-calculator", "name": "Water Usage Calculator", "category": "environment", "subcategory": "Household", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimate household daily, monthly, and annual water use by activity."}, {"slug": "wedding-alcohol-calculator", "name": "Wedding Alcohol Calculator", "category": "event", "subcategory": "Planning", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimate wine, beer, spirits, and champagne quantities for an event."}, {"slug": "weibull-distribution-calculator", "name": "Weibull Distribution Calculator", "category": "math", "subcategory": "Statistics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate Weibull PDF/CDF/reliability, moments, and B-life values."}, {"slug": "when-is-leap-year", "name": "When Is Leap Year", "category": "time-date", "subcategory": "Calendar", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Check leap-year status and nearby leap years using Gregorian rules."}, {"slug": "whip-calculator", "name": "WHIP Calculator", "category": "sports", "subcategory": "Baseball", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate baseball WHIP with baseball innings notation support."}, {"slug": "winter-solstice-day", "name": "Winter Solstice Day", "category": "time-date", "subcategory": "Season", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Return winter solstice date/time for Northern or Southern Hemisphere, 2024-2030."}, {"slug": "yarn-calculator", "name": "Yarn Calculator", "category": "lifestyle", "subcategory": "Crafts", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimate yarn yards, meters, grams, and skeins for common knitting/crochet projects."}, {"slug": "youtube-earnings-estimator", "name": "YouTube Earnings Estimator", "category": "creator", "subcategory": "Revenue", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Estimate YouTube ad revenue from views, CPM range, monetized percentage, and revenue share."}, {"slug": "apr-to-apy-calculator", "name": "APR to APY Calculator", "category": "finance", "subcategory": "Interest", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Convert APR to APY for a selected compounding frequency."}, {"slug": "apy-to-apr-calculator", "name": "APY to APR Calculator", "category": "finance", "subcategory": "Interest", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Convert APY back to nominal APR for a compounding frequency."}, {"slug": "apy-calculator", "name": "APY Calculator", "category": "finance", "subcategory": "Interest", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Calculate annual percentage yield and compound growth."}, {"slug": "effective-interest-rate-calculator", "name": "Effective Interest Rate Calculator", "category": "finance", "subcategory": "Interest", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Convert a nominal interest rate to its effective annual rate."}, {"slug": "future-value-factor-calculator", "name": "Future Value Factor Calculator", "category": "finance", "subcategory": "TVM", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Calculate the future value factor for a rate and number of periods."}, {"slug": "future-value-calculator", "name": "Future Value Calculator", "category": "finance", "subcategory": "TVM", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Calculate future value from a lump sum plus optional recurring contributions."}, {"slug": "present-value-of-lump-sum-calculator", "name": "Present Value of Lump Sum Calculator", "category": "finance", "subcategory": "TVM", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Discount a future lump sum back to present value."}, {"slug": "future-value-of-annuity-calculator", "name": "Future Value of Annuity Calculator", "category": "finance", "subcategory": "TVM", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Calculate future value for ordinary annuities and annuities due."}, {"slug": "present-value-of-annuity-calculator", "name": "Present Value of Annuity Calculator", "category": "finance", "subcategory": "TVM", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Calculate present value for ordinary annuities and annuities due."}, {"slug": "stock-profit-loss-calculator", "name": "Stock Profit Loss Calculator", "category": "finance", "subcategory": "Investing", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Calculate stock trade profit, loss, ROI, and breakeven price."}, {"slug": "future-value-of-lump-sum-calculator", "name": "Future Value of Lump Sum Calculator", "category": "finance", "subcategory": "TVM", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Calculate compound future value for a single lump-sum investment."}, {"slug": "future-value-of-annuity-due-calculator", "name": "Future Value of Annuity Due Calculator", "category": "finance", "subcategory": "TVM", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Calculate future value of an annuity due and compare it with an ordinary annuity."}, {"slug": "future-value-of-growing-annuity-calculator", "name": "Future Value of Growing Annuity Calculator", "category": "finance", "subcategory": "TVM", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Calculate future value for payments that grow each period."}, {"slug": "fvifa-calculator", "name": "FVIFA Calculator", "category": "finance", "subcategory": "TVM", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Calculate the future value interest factor of an annuity."}, {"slug": "bond-equivalent-yield-calculator", "name": "Bond Equivalent Yield Calculator", "category": "finance", "subcategory": "Bonds", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Calculate bond equivalent yield for a discount security."}, {"slug": "emi-calculator", "name": "EMI Calculator", "category": "finance", "subcategory": "Loans", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Calculate equated monthly installment and total interest for a loan."}, {"slug": "gross-rent-multiplier-calculator", "name": "Gross Rent Multiplier Calculator", "category": "finance", "subcategory": "Real Estate", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Calculate gross rent multiplier and rental yield for a property."}, {"slug": "home-equity-calculator", "name": "Home Equity Calculator", "category": "finance", "subcategory": "Real Estate", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Calculate home equity, LTV, CLTV, and optional five-year equity projection."}, {"slug": "car-depreciation-calculator", "name": "Car Depreciation Calculator", "category": "finance", "subcategory": "Auto", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Estimate vehicle depreciation using a declining-balance annual rate."}, {"slug": "car-lease-calculator", "name": "Car Lease Calculator", "category": "finance", "subcategory": "Auto", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Estimate monthly auto lease payment from cap cost, residual value, money factor, tax, and fees."}, {"slug": "3d-distance-calculator", "name": "3D Distance Calculator", "category": "math", "subcategory": "Geometry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate 3D Euclidean distance, midpoint, direction cosines, and related distances."}, {"slug": "find-minimum-maximum", "name": "Find Minimum and Maximum", "category": "math", "subcategory": "Statistics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Find min, max, range, mean, median, positions, and sorted values for a number list."}, {"slug": "density-calculator", "name": "Density Calculator", "category": "science", "subcategory": "Physics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Solve density, mass, or volume with common unit conversions."}, {"slug": "sha384-hash-generator", "name": "SHA-384 Hash Generator", "category": "hash", "subcategory": "Digest", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Generate a SHA-384 hex digest of a UTF-8 string."}, {"slug": "sha512-hash-generator", "name": "SHA-512 Hash Generator", "category": "hash", "subcategory": "Digest", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Generate a SHA-512 hex digest of a UTF-8 string."}, {"slug": "sha3-512-hash-generator", "name": "SHA3-512 Hash Generator", "category": "hash", "subcategory": "Digest", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Generate a SHA3-512 hex digest of a UTF-8 string."}, {"slug": "blake2b-hash-generator", "name": "BLAKE2b Hash Generator", "category": "hash", "subcategory": "Digest", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Generate a BLAKE2b digest with 256, 384, or 512-bit output."}, {"slug": "sha256-hash-generator", "name": "SHA-256 Hash Generator", "category": "hash", "subcategory": "Digest", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Generate a SHA-256 hex digest of a UTF-8 string."}, {"slug": "md5-hash-generator", "name": "MD5 Hash Generator", "category": "hash", "subcategory": "Digest", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Generate an MD5 hex digest for checksum and legacy compatibility."}, {"slug": "feet-to-meters-converter", "name": "Feet to Meters Converter", "category": "math", "subcategory": "Unit Converters", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert feet and optional inches to meters, centimeters, and millimeters."}, {"slug": "meters-to-feet-converter", "name": "Meters to Feet Converter", "category": "math", "subcategory": "Unit Converters", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert meters to decimal feet and feet-and-inches."}, {"slug": "inches-to-cm-converter", "name": "Inches to CM Converter", "category": "math", "subcategory": "Unit Converters", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert inches to centimeters, millimeters, meters, and feet."}, {"slug": "percentage-calculator", "name": "Percentage Calculator", "category": "math", "subcategory": "Percentage", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Six percentage operations behind one endpoint, selected by mode."}, {"slug": "square-root-calculator", "name": "Square Root Calculator", "category": "math", "subcategory": "Algebra", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate the principal and negative square roots of a non-negative number."}, {"slug": "sum-of-squares-calculator", "name": "Sum of Squares Calculator", "category": "math", "subcategory": "Sequences", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate 1^2 + 2^2 + ... + n^2."}, {"slug": "sum-of-cubes-calculator", "name": "Sum of Cubes Calculator", "category": "math", "subcategory": "Sequences", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate 1^3 + 2^3 + ... + n^3."}, {"slug": "root-mean-square-calculator", "name": "Root Mean Square Calculator", "category": "math", "subcategory": "Statistics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate root mean square for a numeric list."}, {"slug": "golden-ratio-calculator", "name": "Golden Ratio Calculator", "category": "math", "subcategory": "Geometry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate golden-ratio segments from total, larger, or smaller segment."}, {"slug": "golden-rectangle-calculator", "name": "Golden Rectangle Calculator", "category": "math", "subcategory": "Geometry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate golden rectangle dimensions, area, perimeter, and aspect ratio."}, {"slug": "golden-section-calculator", "name": "Golden Section Calculator", "category": "math", "subcategory": "Geometry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Find the golden-section points within an interval."}, {"slug": "slope-calculator", "name": "Slope Calculator", "category": "math", "subcategory": "Geometry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate slope, angle, intercepts, and line equation from two points."}, {"slug": "slope-intercept-form-calculator", "name": "Slope Intercept Form Calculator", "category": "math", "subcategory": "Algebra", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Build slope-intercept and standard-form line equations from m and b."}, {"slug": "x-y-intercept-calculator", "name": "X and Y Intercept Calculator", "category": "math", "subcategory": "Algebra", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Find x- and y-intercepts for a linear equation ax + by + c = 0."}, {"slug": "effective-yield-calculator", "name": "Effective Yield Calculator", "category": "finance", "subcategory": "Interest", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Calculate effective annual yield from nominal APR and compounding frequency."}, {"slug": "ebit-calculator", "name": "EBIT Calculator", "category": "finance", "subcategory": "Profit", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Calculate EBIT and EBIT margin from revenue, expenses, and non-operating income."}, {"slug": "ebitda-calculator", "name": "EBITDA Calculator", "category": "finance", "subcategory": "Profit", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Calculate EBITDA using net income or operating income inputs."}, {"slug": "debtor-days-calculator", "name": "Debtor Days Calculator", "category": "finance", "subcategory": "Efficiency", "version": "2026-04-22", "credit_weight": 2, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Calculate debtor days, receivables ratio, and working capital above a 30-day target."}, {"slug": "final-grade-calculator", "name": "Final Grade Calculator", "category": "math", "subcategory": "Education", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate the final exam score needed to reach a target course grade."}, {"slug": "half-life-calculator", "name": "Half Life Calculator", "category": "math", "subcategory": "Exponents", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Solve exponential decay for remaining amount, initial amount, elapsed time, or half-life."}, {"slug": "goldbach-conjecture-verifier", "name": "Goldbach Conjecture Verifier", "category": "math", "subcategory": "Number Theory", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Verify an even integer by finding prime pairs that sum to it."}, {"slug": "happy-number-calculator", "name": "Happy Number Calculator", "category": "math", "subcategory": "Sequences", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Check whether a number is happy or list happy numbers up to a limit."}, {"slug": "great-circle-distance-calculator", "name": "Great Circle Distance Calculator", "category": "math", "subcategory": "Geometry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate great-circle distance, bearing, and midpoint between two coordinates."}, {"slug": "dice-roll-probability-calculator", "name": "Dice Roll Probability Calculator", "category": "math", "subcategory": "Probability", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate exact probability metrics for sums of identical dice."}, {"slug": "absolute-value-equation-solver", "name": "Absolute Value Equation Solver", "category": "math", "subcategory": "Algebra", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Solve equations of the form |a*x + b| = c."}, {"slug": "absolute-value-inequality-solver", "name": "Absolute Value Inequality Solver", "category": "math", "subcategory": "Algebra", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Solve inequalities of the form |a*x + b| compared with c."}, {"slug": "heron-s-formula-calculator", "name": "Heron's Formula Calculator", "category": "math", "subcategory": "Geometry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate triangle area from three side lengths using Heron's formula."}, {"slug": "hypotenuse-calculator", "name": "Hypotenuse Calculator", "category": "math", "subcategory": "Geometry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate the hypotenuse and basic right-triangle measures from two legs."}, {"slug": "law-of-cosines-calculator", "name": "Law of Cosines Calculator", "category": "math", "subcategory": "Trigonometry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Use the law of cosines to solve a side or included angle."}, {"slug": "law-of-sines-calculator", "name": "Law of Sines Calculator", "category": "math", "subcategory": "Trigonometry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Use the law of sines to solve a side or possible angle."}, {"slug": "frustum-calculator", "name": "Frustum Calculator", "category": "math", "subcategory": "Geometry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate volume and surface area for a conical frustum."}, {"slug": "hyperbola-calculator", "name": "Hyperbola Calculator", "category": "math", "subcategory": "Conics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate standard-form hyperbola vertices, foci, eccentricity, and asymptotes."}, {"slug": "hyperbolic-functions-calculator", "name": "Hyperbolic Functions Calculator", "category": "math", "subcategory": "Functions", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate sinh, cosh, tanh and reciprocal hyperbolic functions."}, {"slug": "geometric-sequence-calculator", "name": "Geometric Sequence Calculator", "category": "math", "subcategory": "Sequences", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate nth term, partial sum, and sample terms for a geometric sequence."}, {"slug": "csc-sec-cot-calculator", "name": "Cosecant/Secant/Cotangent Calculator", "category": "math", "subcategory": "Trigonometry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate csc, sec, cot, sine, and cosine for an angle."}, {"slug": "complementary-error-function-calculator", "name": "Complementary Error Function Calculator", "category": "math", "subcategory": "Advanced", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate erf(x), erfc(x), and related error-function values."}, {"slug": "correlation-coefficient-calculator", "name": "Correlation Coefficient Calculator", "category": "math", "subcategory": "Statistics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate Pearson, Spearman, and Kendall correlation coefficients."}, {"slug": "cohens-d-calculator", "name": "Cohen's d Calculator", "category": "math", "subcategory": "Statistics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate Cohen's d, Hedges' g, overlap, and effect-size interpretation."}, {"slug": "determinant-calculator", "name": "Determinant Calculator", "category": "math", "subcategory": "Linear Algebra", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate the determinant, trace, rank, and invertibility of a square matrix."}, {"slug": "cramer-s-rule-calculator", "name": "Cramer's Rule Calculator", "category": "math", "subcategory": "Linear Algebra", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Solve 2x2 or 3x3 linear systems with Cramer's rule."}, {"slug": "cubic-equation-solver", "name": "Cubic Equation Solver", "category": "math", "subcategory": "Algebra", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Solve ax^3 + bx^2 + cx + d = 0 and return all real or complex roots."}, {"slug": "cholesky-decomposition-calculator", "name": "Cholesky Decomposition Calculator", "category": "math", "subcategory": "Linear Algebra", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Decompose a symmetric positive-definite matrix into A = L L^T."}, {"slug": "column-space-calculator", "name": "Column Space Calculator", "category": "math", "subcategory": "Linear Algebra", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Find matrix pivot columns, rank, nullity, RREF, and a column-space basis."}, {"slug": "characteristic-polynomial-calculator", "name": "Characteristic Polynomial Calculator", "category": "math", "subcategory": "Linear Algebra", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate characteristic polynomial coefficients for a square matrix."}, {"slug": "acceleration-calculator", "name": "Acceleration Calculator", "category": "math", "subcategory": "Physics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate acceleration from velocity change, distance, force, centripetal motion, or free fall."}, {"slug": "area-of-a-parallelogram-calculator", "name": "Area of a Parallelogram Calculator", "category": "math", "subcategory": "Geometry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Find parallelogram area from base-height, sides-angle, or diagonals-angle inputs."}, {"slug": "area-of-equilateral-triangle-calculator", "name": "Area of Equilateral Triangle Calculator", "category": "math", "subcategory": "Geometry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate equilateral-triangle side, area, height, perimeter, and radii."}, {"slug": "arithmetic-sequence-calculator", "name": "Arithmetic Sequence Calculator", "category": "math", "subcategory": "Sequences", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate the nth term and partial sum of an arithmetic sequence."}, {"slug": "aspect-ratio-calculator", "name": "Aspect Ratio Calculator", "category": "math", "subcategory": "Ratios", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Simplify dimensions to a ratio, derive dimensions from a ratio, or resize proportionally."}, {"slug": "average-calculator", "name": "Average Calculator", "category": "math", "subcategory": "Statistics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate mean, median, mode, range, variance, and optional weighted average."}, {"slug": "average-deviation-calculator", "name": "Average Deviation Calculator", "category": "math", "subcategory": "Statistics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate mean and median absolute deviation for a numeric dataset."}, {"slug": "base64-decoder", "name": "Base64 Decoder", "category": "dev", "subcategory": "Encoding", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Decode standard or URL-safe Base64 text and return byte and character analysis."}, {"slug": "bcd-to-decimal-converter", "name": "BCD to Decimal Converter", "category": "math", "subcategory": "Number Systems", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert binary-coded decimal nibbles to a decimal integer."}, {"slug": "cmyk-to-hex-converter", "name": "CMYK to Hex Converter", "category": "dev", "subcategory": "Color", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert CMYK percentages to RGB, HEX, HSL, HSV, and contrast text color."}, {"slug": "grams-to-pounds-converter", "name": "Grams to Pounds Converter", "category": "math", "subcategory": "Unit Converters", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert grams to pounds, ounces, and kilograms."}, {"slug": "pounds-to-grams-converter", "name": "Pounds to Grams Converter", "category": "math", "subcategory": "Unit Converters", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert pounds to grams, kilograms, ounces, and milligrams."}, {"slug": "kg-to-lbs-converter", "name": "kg to lbs Converter", "category": "math", "subcategory": "Unit Converters", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert kilograms and pounds with ounce breakdown."}, {"slug": "kpa-to-psi-converter", "name": "kPa to psi Converter", "category": "math", "subcategory": "Unit Converters", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert kilopascals to psi, bar, atm, and mmHg."}, {"slug": "liters-to-cups-converter", "name": "Liters to Cups Converter", "category": "math", "subcategory": "Unit Converters", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert liters to US, metric, and imperial cups."}, {"slug": "ounces-to-cups-converter", "name": "Ounces to Cups Converter", "category": "math", "subcategory": "Unit Converters", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert US fluid ounces and cups with spoon and milliliter equivalents."}, {"slug": "ratio-to-percentage-calculator", "name": "Ratio to Percentage Calculator", "category": "math", "subcategory": "Number Systems", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert ratios, fractions, or decimal divisions to percentages."}, {"slug": "scientific-notation-to-decimal-converter", "name": "Scientific Notation to Decimal Converter", "category": "math", "subcategory": "Number Systems", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert scientific notation to ordinary decimal notation."}, {"slug": "random-color-generator", "name": "Random Color Generator", "category": "random", "subcategory": "Color", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Generate random HEX, RGB, and HSL colors with optional harmony rules."}, {"slug": "random-port-number-generator", "name": "Random Port Number Generator", "category": "random", "subcategory": "Network", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Generate random network port numbers in standard or custom ranges."}, {"slug": "binary-to-bcd-converter", "name": "Binary to BCD Converter", "category": "math", "subcategory": "Number Systems", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert an integer binary value to binary-coded decimal."}, {"slug": "gray-code-to-binary-converter", "name": "Gray Code to Binary Converter", "category": "math", "subcategory": "Number Systems", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert Gray code to ordinary binary with XOR steps."}, {"slug": "hex-to-binary-converter", "name": "Hex to Binary Converter", "category": "math", "subcategory": "Number Systems", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert a hexadecimal integer to binary."}, {"slug": "hex-to-decimal-converter", "name": "Hex to Decimal Converter", "category": "math", "subcategory": "Number Systems", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert a hexadecimal integer to decimal with digit breakdown."}, {"slug": "hex-to-octal-converter", "name": "Hex to Octal Converter", "category": "math", "subcategory": "Number Systems", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert a hexadecimal integer to octal through binary grouping."}, {"slug": "hex-to-bcd-converter", "name": "Hex to BCD Converter", "category": "math", "subcategory": "Number Systems", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert a hexadecimal integer to binary-coded decimal."}, {"slug": "hex-to-rgb-converter", "name": "Hex to RGB Converter", "category": "dev", "subcategory": "Color", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert a hex color to RGB, HSL, CMYK, and contrast metrics."}, {"slug": "hex-to-cmyk-converter", "name": "Hex to CMYK Converter", "category": "dev", "subcategory": "Color", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert a hex color to CMYK print percentages."}, {"slug": "octal-to-binary-converter", "name": "Octal to Binary Converter", "category": "math", "subcategory": "Number Systems", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert an octal integer to binary with per-digit mapping."}, {"slug": "octal-to-decimal-converter", "name": "Octal to Decimal Converter", "category": "math", "subcategory": "Number Systems", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert an octal integer to decimal with positional breakdown."}, {"slug": "base-converter", "name": "Base Converter", "category": "math", "subcategory": "Number Systems", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert integers between bases 2 through 36."}, {"slug": "bcd-to-binary-converter", "name": "BCD to Binary Converter", "category": "math", "subcategory": "Number Systems", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert 8421 BCD nibbles to decimal and binary."}, {"slug": "bcd-to-hex-converter", "name": "BCD to Hex Converter", "category": "math", "subcategory": "Number Systems", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert BCD to hexadecimal or hexadecimal to BCD."}, {"slug": "binary-calculator", "name": "Binary Calculator", "category": "math", "subcategory": "Number Systems", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Run binary arithmetic and bitwise operations."}, {"slug": "circle-calculator", "name": "Circle Calculator", "category": "math", "subcategory": "Geometry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate circle radius, diameter, circumference, area, and optional arc/sector values."}, {"slug": "comparing-fractions-calculator", "name": "Comparing Fractions Calculator", "category": "math", "subcategory": "Fractions", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Compare two fractions or mixed numbers using a common denominator."}, {"slug": "cube-and-cube-root-calculator", "name": "Cube and Cube Root Calculator", "category": "math", "subcategory": "Basic Math", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate a number's cube and cube root."}, {"slug": "cube-root-calculator", "name": "Cube Root Calculator", "category": "math", "subcategory": "Basic Math", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate the real cube root of a finite number."}, {"slug": "decimal-to-fraction-calculator", "name": "Decimal to Fraction Calculator", "category": "math", "subcategory": "Fractions", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert a decimal or parenthesized repeating decimal to a fraction."}, {"slug": "decimal-to-scientific-notation-converter", "name": "Decimal to Scientific Notation Converter", "category": "math", "subcategory": "Number Systems", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert decimal numbers to scientific, E, and engineering notation."}, {"slug": "decimal-to-binary-converter", "name": "Decimal to Binary Converter", "category": "math", "subcategory": "Number Systems", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert a decimal integer to binary with grouped bits and division steps."}, {"slug": "decimal-to-hex-converter", "name": "Decimal to Hex Converter", "category": "math", "subcategory": "Number Systems", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert a decimal integer to hexadecimal with conversion steps."}, {"slug": "binary-to-octal-converter", "name": "Binary to Octal Converter", "category": "math", "subcategory": "Number Systems", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert a binary number to octal using 3-bit grouping."}, {"slug": "binary-to-gray-code-converter", "name": "Binary to Gray Code Converter", "category": "math", "subcategory": "Number Systems", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert an integer binary value to Gray code."}, {"slug": "baking-pan-size-converter", "name": "Baking Pan Size Converter", "category": "cooking", "subcategory": "Baking", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Scale a recipe when switching between common baking pan sizes."}, {"slug": "boiling-point-calculator", "name": "Boiling Point Calculator", "category": "physics", "subcategory": "Thermodynamics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate water boiling point from altitude or atmospheric pressure."}, {"slug": "brine-and-salinity-calculator", "name": "Brine and Salinity Calculator", "category": "cooking", "subcategory": "Fermentation", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate salt, water, or salinity for brines and fermentation recipes."}, {"slug": "coffee-brew-ratio-calculator", "name": "Coffee Brew Ratio Calculator", "category": "cooking", "subcategory": "Coffee", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate coffee and water amounts for common brewing methods and strengths."}, {"slug": "cross-stitch-size-calculator", "name": "Cross-Stitch Size Calculator", "category": "craft", "subcategory": "Sizing", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate finished cross-stitch design and fabric sizes from stitch and fabric counts."}, {"slug": "color-code-converter-all-formats", "name": "Color Code Converter", "category": "color", "subcategory": "Conversion", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert HEX, RGB, HSL, HSV, CMYK, and common CSS named colors."}, {"slug": "color-contrast-checker", "name": "Color Contrast Checker", "category": "color", "subcategory": "Accessibility", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Check WCAG contrast ratio and AA/AAA compliance for two colors."}, {"slug": "complex-numbers-calculator", "name": "Complex Numbers Calculator", "category": "math", "subcategory": "Complex Numbers", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Add, subtract, multiply, or divide two complex numbers."}, {"slug": "base-n-calculator", "name": "Base-N Calculator", "category": "math", "subcategory": "Number Systems", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert an integer from any base 2 through 36 to every other base."}, {"slug": "color-scheme-generator", "name": "Color Scheme Generator", "category": "color", "subcategory": "Palette", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Generate complementary, analogous, triadic, square, tetradic, and monochromatic palettes."}, {"slug": "random-integer-generator", "name": "Random Integer Generator", "category": "random", "subcategory": "Numbers", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Generate random integers with optional uniqueness, sorting, exclusions, and seed replay."}, {"slug": "random-decimal-number-generator", "name": "Random Decimal Number Generator", "category": "random", "subcategory": "Numbers", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Generate random decimal numbers between 0 and 1 with configurable precision."}, {"slug": "random-letter-generator", "name": "Random Letter Generator", "category": "random", "subcategory": "Text", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Generate random letters with case, vowel/consonant, and duplicate controls."}, {"slug": "random-string-generator", "name": "Random String Generator", "category": "random", "subcategory": "Text", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Generate random strings, passwords, API keys, tokens, PINs, or hex strings."}, {"slug": "random-date-generator", "name": "Random Date Generator", "category": "random", "subcategory": "Date", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Generate random dates inside a bounded date range."}, {"slug": "random-line-picker", "name": "Random Line Picker", "category": "random", "subcategory": "Lists", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Pick random non-empty lines from user-supplied text."}, {"slug": "list-randomizer", "name": "List Randomizer", "category": "random", "subcategory": "Lists", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Shuffle a newline-separated list into random order."}, {"slug": "random-group-generator", "name": "Random Group Generator", "category": "random", "subcategory": "Lists", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Create random balanced groups from a newline-separated list of names."}, {"slug": "random-playing-card-generator", "name": "Random Playing Card Generator", "category": "random", "subcategory": "Cards", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Draw random playing cards from a standard deck with optional jokers."}, {"slug": "random-quote-generator", "name": "Random Quote Generator", "category": "random", "subcategory": "Quotes", "version": "2026-04-22", "credit_weight": 3, "methods": ["POST"], "tier_access": ["starter", "pro", "business", "scale"], "summary": "Generate or search quotes from a bundled SQLite quote database."}, {"slug": "decimal-to-percent-converter", "name": "Decimal to Percent Converter", "category": "math", "subcategory": "Percentage", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert one or more decimal numbers to percentages."}, {"slug": "percent-off-calculator", "name": "Percent Off Calculator", "category": "finance", "subcategory": "Discounts", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate discount amount and sale price from original price and percent off."}, {"slug": "test-score-calculator", "name": "Test Score Calculator", "category": "miscellaneous", "subcategory": "Student Calculators", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert earned and total test points into a percentage, letter grade, and GPA points."}, {"slug": "weighted-grade-calculator", "name": "Weighted Grade Calculator", "category": "miscellaneous", "subcategory": "Student Calculators", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate a weighted course grade from category weights and scores."}, {"slug": "time-duration-calculator", "name": "Time Duration Calculator", "category": "time-date", "subcategory": "Time Calculators", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate elapsed time between two times or datetimes."}, {"slug": "time-to-decimal-converter", "name": "Time to Decimal Converter", "category": "time-date", "subcategory": "Time Calculators", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert between hours/minutes/seconds and decimal hours."}, {"slug": "unix-permission-calculator", "name": "Unix Permission Calculator", "category": "developer", "subcategory": "General Tools", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert Unix permission digits into symbolic permissions and chmod notation."}, {"slug": "tire-size-calculator", "name": "Tire Size Calculator", "category": "miscellaneous", "subcategory": "General Tools", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate tire sidewall, diameter, circumference, and revolutions per mile."}, {"slug": "torus-calculator", "name": "Torus Calculator", "category": "math", "subcategory": "Geometry Calculators", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate torus volume, surface area, and key radii."}, {"slug": "unit-vector-calculator", "name": "Unit Vector Calculator", "category": "math", "subcategory": "Linear Algebra", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Normalize a vector and return its unit vector."}, {"slug": "vector-magnitude-calculator", "name": "Vector Magnitude Calculator", "category": "math", "subcategory": "Linear Algebra", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate the Euclidean magnitude and unit vector for any vector."}, {"slug": "vector-projection-calculator", "name": "Vector Projection Calculator", "category": "math", "subcategory": "Linear Algebra", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Project one vector onto another and compute the orthogonal component."}, {"slug": "celsius-to-fahrenheit-calculator", "name": "Celsius to Fahrenheit Calculator", "category": "science", "subcategory": "Temperature", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert Celsius to Fahrenheit and related temperature scales."}, {"slug": "celsius-to-kelvin-converter", "name": "Celsius to Kelvin Converter", "category": "science", "subcategory": "Temperature", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert Celsius to Kelvin and related temperature scales."}, {"slug": "celsius-to-rankine-converter", "name": "Celsius to Rankine Converter", "category": "science", "subcategory": "Temperature", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert Celsius to Rankine and related temperature scales."}, {"slug": "fahrenheit-to-celsius-calculator", "name": "Fahrenheit to Celsius Calculator", "category": "science", "subcategory": "Temperature", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert Fahrenheit to Celsius and related temperature scales."}, {"slug": "fahrenheit-to-kelvin-converter", "name": "Fahrenheit to Kelvin Converter", "category": "science", "subcategory": "Temperature", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert Fahrenheit to Kelvin and related temperature scales."}, {"slug": "fahrenheit-to-rankine-converter", "name": "Fahrenheit to Rankine Converter", "category": "science", "subcategory": "Temperature", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert Fahrenheit to Rankine and related temperature scales."}, {"slug": "kelvin-to-celsius-converter", "name": "Kelvin to Celsius Converter", "category": "science", "subcategory": "Temperature", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert Kelvin to Celsius and related temperature scales."}, {"slug": "kelvin-to-fahrenheit-converter", "name": "Kelvin to Fahrenheit Converter", "category": "science", "subcategory": "Temperature", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert Kelvin to Fahrenheit and related temperature scales."}, {"slug": "rankine-to-celsius-converter", "name": "Rankine to Celsius Converter", "category": "science", "subcategory": "Temperature", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert Rankine to Celsius and related temperature scales."}, {"slug": "rankine-to-fahrenheit-converter", "name": "Rankine to Fahrenheit Converter", "category": "science", "subcategory": "Temperature", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert Rankine to Fahrenheit and related temperature scales."}, {"slug": "word-counter", "name": "Word Counter", "category": "text", "subcategory": "Analysis", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Count words, characters, sentences, paragraphs, reading/speaking time, top words."}, {"slug": "character-counter", "name": "Character Counter", "category": "text", "subcategory": "Analysis", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Count characters, letters, digits, whitespace, and punctuation."}, {"slug": "line-counter", "name": "Line Counter", "category": "text", "subcategory": "Analysis", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Count total / non-empty / empty lines and longest-line length."}, {"slug": "remove-spaces", "name": "Remove Spaces", "category": "text", "subcategory": "Whitespace", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Strip whitespace: all, extra, leading, trailing, or per-line."}, {"slug": "add-line-numbers", "name": "Add Line Numbers", "category": "text", "subcategory": "Modification", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Add configurable line numbers to the start or end of each text line."}, {"slug": "wind-chill-calculator", "name": "Wind Chill Calculator", "category": "science", "subcategory": "Weather", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate NWS wind chill and frostbite risk from air temperature and wind speed."}, {"slug": "wire-gauge-calculator", "name": "Wire Gauge Calculator", "category": "engineering", "subcategory": "Electrical", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate AWG diameter, area, resistance, ampacity, and optional voltage drop."}, {"slug": "work-and-power-calculator", "name": "Work and Power Calculator", "category": "science", "subcategory": "Physics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate mechanical work and power with common unit conversions."}, {"slug": "yeast-conversion-calculator", "name": "Yeast Conversion Calculator", "category": "cooking", "subcategory": "Conversions", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert fresh, active dry, and instant yeast amounts."}, {"slug": "xml-to-json-converter", "name": "XML to JSON Converter", "category": "developer", "subcategory": "Data Conversion", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert XML into JSON using standard, compact, JsonML, or preserve styles."}, {"slug": "yaml-formatter-validator", "name": "YAML Formatter/Validator", "category": "developer", "subcategory": "Data Formatting", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Validate, format, minify, or convert YAML to JSON."}, {"slug": "zscore-calculator", "name": "Z-Score Calculator", "category": "math", "subcategory": "Statistics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate z-scores, inverse values, percentiles, and normal probabilities."}, {"slug": "word-frequency-analyzer", "name": "Word Frequency Analyzer", "category": "text", "subcategory": "Text Statistics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Analyze word frequency, unique words, lexical diversity, and CSV output."}, {"slug": "word-to-phone-number-converter", "name": "Word to Phone Number Converter", "category": "text", "subcategory": "Text Conversion", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert words and phrases into T9 keypad phone numbers."}, {"slug": "xml-validator", "name": "XML Validator", "category": "developer", "subcategory": "Data Validation", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Validate XML well-formedness and return document statistics."}, {"slug": "add-prefix-and-suffix", "name": "Add Prefix and Suffix", "category": "text", "subcategory": "Modification", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Add prefix, suffix, and optional numbering to each text line, word, or delimited item."}, {"slug": "compare-two-strings", "name": "Compare Two Strings", "category": "text", "subcategory": "Analysis", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Compare two strings with equality, similarity, edit distance, and diff statistics."}, {"slug": "find-longest-line", "name": "Find Longest Line", "category": "text", "subcategory": "Analysis", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Rank text lines by character, word, or byte length and return the longest lines."}, {"slug": "lowercase-uppercase-letters", "name": "Text Case Converter", "category": "text", "subcategory": "Case", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert text to uppercase, lowercase, title, sentence, camel, snake, kebab, and related cases."}, {"slug": "remove-duplicate-lines", "name": "Remove Duplicate Lines", "category": "text", "subcategory": "Deduplication", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Remove duplicate text lines while keeping first, last, or only unique occurrences."}, {"slug": "remove-empty-lines", "name": "Remove Empty Lines", "category": "text", "subcategory": "Whitespace", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Remove blank or whitespace-only lines from text and report line reduction statistics."}, {"slug": "remove-line-numbers", "name": "Remove Line Numbers", "category": "text", "subcategory": "Modification", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Strip numeric prefixes such as line numbers from each line of text."}, {"slug": "remove-punctuation", "name": "Remove Punctuation", "category": "text", "subcategory": "Modification", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Remove or replace selected punctuation categories from text."}, {"slug": "reverse-text", "name": "Reverse Text", "category": "text", "subcategory": "Modification", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Reverse whole text, word order, each word, or line order."}, {"slug": "title-case-converter", "name": "Title Case Converter", "category": "text", "subcategory": "Case", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert text to title case using smart, APA, Chicago, MLA, AP, or simple capitalization rules."}, {"slug": "remove-leading-trailing-spaces", "name": "Remove Leading Trailing Spaces", "category": "text", "subcategory": "Whitespace", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Trim leading and trailing spaces or tabs from each line."}, {"slug": "sentence-counter", "name": "Sentence Counter", "category": "text", "subcategory": "Analysis", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Count sentences and classify sentence type and basic complexity."}, {"slug": "remove-lines-containing", "name": "Remove Lines Containing", "category": "text", "subcategory": "Modification", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Keep or remove lines matching a text, word, prefix, suffix, or regex pattern."}, {"slug": "sort-lines-alphabetically", "name": "Sort Lines Alphabetically", "category": "text", "subcategory": "Sorting", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Sort text lines alphabetically, naturally, numerically, or by length."}, {"slug": "text-repeat", "name": "Text Repeat", "category": "text", "subcategory": "Text Modification", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Repeat text multiple times with separators, numbering, and case options."}, {"slug": "url-slug-generator", "name": "URL Slug Generator", "category": "webmaster", "subcategory": "SEO", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Generate an SEO-friendly URL slug from a title or phrase."}, {"slug": "upside-down-text-generator", "name": "Upside Down Text Generator", "category": "text", "subcategory": "Text Modification", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Flip text upside down using Unicode character mappings."}, {"slug": "text-to-binary-hex-ascii-converter", "name": "Text to Binary/Hex/ASCII Converter", "category": "developer", "subcategory": "Encoders", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Encode or decode text, binary, hex, and ASCII byte values."}, {"slug": "text-to-sql-list-converter", "name": "Text to SQL List Converter", "category": "developer", "subcategory": "Text Conversion", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert lines of text into quoted SQL IN-list or tuple syntax."}, {"slug": "unix-time-converter", "name": "Unix Time Converter", "category": "time-date", "subcategory": "Time Conversion", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert between Unix timestamps and UTC ISO datetimes."}, {"slug": "date-difference-calculator", "name": "Date Difference Calculator", "category": "time-date", "subcategory": "Date Tools", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate days, weeks, approximate months/years, and business days between two dates."}, {"slug": "date-calculator", "name": "Date Calculator", "category": "time-date", "subcategory": "Date Tools", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Add or subtract years, months, weeks, and days from a date."}, {"slug": "work-hours-calculator", "name": "Work Hours Calculator", "category": "time-date", "subcategory": "Time Calculators", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate weekly work hours, overtime, and optional pay from day entries."}, {"slug": "time-between-two-dates", "name": "Time Between Two Dates", "category": "time-date", "subcategory": "Date Tools", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate exact elapsed time between two ISO datetimes."}, {"slug": "distance-between-two-points-calculator", "name": "Distance Between Two Points Calculator", "category": "math", "subcategory": "Geometry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate 2D point distance, midpoint, slope, and line equation."}, {"slug": "dot-product-calculator", "name": "Dot Product Calculator", "category": "math", "subcategory": "Linear Algebra", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate the dot product, magnitudes, angle, and vector projection."}, {"slug": "cross-product-calculator", "name": "Cross Product Calculator", "category": "math", "subcategory": "Linear Algebra", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate the 3D cross product, magnitude, areas, and angle."}, {"slug": "cups-to-gallons-converter", "name": "Cups to Gallons Converter", "category": "math", "subcategory": "Volume", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert US cups and gallons with related volume units."}, {"slug": "cups-to-liters-converter", "name": "Cups to Liters Converter", "category": "math", "subcategory": "Volume", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert US cups and liters with milliliter, fluid-ounce, and spoon equivalents."}, {"slug": "cups-to-ounces-converter", "name": "Cups to Ounces Converter", "category": "math", "subcategory": "Volume", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert cups and fluid ounces for US customary, US legal, imperial, or metric cups."}, {"slug": "cups-to-quarts-converter", "name": "Cups to Quarts Converter", "category": "math", "subcategory": "Volume", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert US cups and quarts with related volume units."}, {"slug": "cups-to-teaspoons-converter", "name": "Cups to Teaspoons Converter", "category": "math", "subcategory": "Volume", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert US cups and teaspoons with tablespoon and fluid-ounce equivalents."}, {"slug": "degree-to-radian-converter", "name": "Degree to Radian Converter", "category": "math", "subcategory": "Trigonometry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert degrees to radians with pi-fraction, quadrant, and trig values."}, {"slug": "dms-to-decimal-converter", "name": "DMS to Decimal Degrees Converter", "category": "math", "subcategory": "Trigonometry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert degrees, minutes, and seconds to signed decimal degrees."}, {"slug": "cartesian-to-polar-converter", "name": "Cartesian to Polar Coordinates Converter", "category": "math", "subcategory": "Geometry", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert Cartesian x-y coordinates to polar radius and angle."}, {"slug": "combination-calculator", "name": "Combination Calculator", "category": "math", "subcategory": "Combinatorics", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate combinations C(n, k)."}, {"slug": "even-or-odd-number-checker", "name": "Even or Odd Number Checker", "category": "math", "subcategory": "Basic Math", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Check whether one or more integers are even or odd."}, {"slug": "css-compressor", "name": "CSS Compressor", "category": "webmaster", "subcategory": "CSS", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Minify CSS and return compression statistics."}, {"slug": "css-beautifier", "name": "CSS Beautifier", "category": "text", "subcategory": "CSS", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Format compact CSS with indentation and line breaks."}, {"slug": "css-box-shadow-generator", "name": "CSS Box Shadow Generator", "category": "webmaster", "subcategory": "CSS", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Generate a CSS box-shadow declaration from numeric shadow controls."}, {"slug": "csv-to-srt", "name": "CSV to SRT Converter", "category": "text", "subcategory": "Subtitles", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert CSV subtitle rows with start, end, and text columns to SRT."}, {"slug": "cooking-unit-converter", "name": "Cooking Unit Converter", "category": "cooking", "subcategory": "Conversion", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Convert cooking volume and weight units using ingredient density."}, {"slug": "continuous-compounding-calculator", "name": "Continuous Compounding Calculator", "category": "finance", "subcategory": "Interest", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate future value and interest with continuous compounding."}, {"slug": "compound-savings-calculator", "name": "Compound Savings Calculator", "category": "finance", "subcategory": "Savings", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Project savings growth with compound interest and regular contributions."}, {"slug": "break-even-calculator", "name": "Break-Even Calculator", "category": "finance", "subcategory": "Profit", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate break-even units, revenue, contribution margin, and target-profit units."}, {"slug": "ctr-calculator", "name": "CTR Calculator", "category": "marketing", "subcategory": "Advertising", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate click-through rate, required clicks for a target CTR, or bulk campaign CTR."}, {"slug": "actual-cash-value-calculator", "name": "Actual Cash Value Calculator", "category": "finance", "subcategory": "Depreciation", "version": "2026-04-22", "credit_weight": 1, "methods": ["POST"], "tier_access": ["free", "starter", "pro", "business", "scale"], "summary": "Calculate actual cash value from replacement cost, age, lifespan, salvage, and depreciation method."}], "count": 1080, "total_matching": 1080}