For the complete documentation index, see llms.txt.
480 endpoints · 27 categories

Catalog

480 JSON endpoints, each with a typed schema, a published credit cost, a hosted playground, and copy-paste snippets. Press / to search.

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Finance 103 Text 30 Hash & Checksum 6 Math 215 Random 12 Webmaster 8 Color 3 Construction 5 Conversion 1 Converters 1 Cooking 8 Craft 1 Creator 1 Datetime 2 Dev 5 Developer 6 Electronics 4 Engineering 1 Environment 1 Event 1 Lifestyle 6 Marketing 1 Miscellaneous 4 Physics 1 Science 32 Sports 13 Time-Date 9

Finance 103 endpoints full page →

Exact interest, mortgage, APY, and other money math.

Auto
Car Depreciation Calculatorcar-depreciation-calculator
Estimate vehicle depreciation using a declining-balance annual rate.
2cr
Car Lease Calculatorcar-lease-calculator
Estimate monthly auto lease payment from cap cost, residual value, money factor, tax, and fees.
2cr
Bonds
Bond Equivalent Yield Calculatorbond-equivalent-yield-calculator
Calculate bond equivalent yield for a discount security.
2cr
Zero Coupon Bond Calculatorzero-coupon-bond-calculator
Calculate zero coupon bond price or yield to maturity.
2cr
Credit
Credit Card Interest Calculatorcredit-card-interest-calculator
Estimate credit card payoff time, interest cost, and payment strategy savings.
2cr
Credit Card Calculators
Credit Card Payment Calculatorcredit-card-payment-calculator
Calculate the fixed monthly payment needed to pay off a credit card balance over a chosen number of months.
1cr
Credit Card Payoff Calculatorcredit-card-payoff-calculator
Estimate how long a credit card payoff plan will take and how much interest it costs.
1cr
Debt
Debt Coverage Ratio Calculatordebt-coverage-ratio-calculator
Calculate debt service coverage ratio from NOI and debt service, or build NOI from property inputs.
2cr
Debt to Income Ratio Calculatordebt-to-income-ratio-calculator
Calculate debt-to-income ratio from monthly income and debt payments.
2cr
Fixed Charge Coverage Ratio Calculatorfixed-charge-coverage-ratio-calculator
Calculate fixed charge coverage ratio with optional EBITDA and principal-payment adjustments.
2cr
Interest Coverage Ratio Calculatorinterest-coverage-ratio-calculator
Calculate EBIT or EBITDA based interest coverage ratio.
2cr
Times Interest Earned Ratio Calculatortimes-interest-earned-ratio-calculator
Calculate times interest earned ratio and interest coverage safety margin.
2cr
Debt Calculators
Debt Payoff Calculatordebt-payoff-calculator
Compare debt snowball and avalanche payoff strategies for a small list of debts.
1cr
Depreciation
Actual Cash Value Calculatoractual-cash-value-calculator
Calculate actual cash value from replacement cost, age, lifespan, salvage, and depreciation method.
1cr
Discounts
Discount Calculatordiscount-calculator
Calculate final price, savings, tax, stacked discounts, or BOGO deals.
1cr
Percent Off Calculatorpercent-off-calculator
Calculate discount amount and sale price from original price and percent off.
1cr
Efficiency
Average Collection Period Calculatoraverage-collection-period-calculator
Calculate average collection period, receivables turnover, and industry benchmark spread.
2cr
Debtor Days Calculatordebtor-days-calculator
Calculate debtor days, receivables ratio, and working capital above a 30-day target.
2cr
Fixed Asset Turnover Calculatorfixed-asset-turnover-calculator
Measure revenue generated per dollar of net fixed assets.
2cr
Inventory Turnover Calculatorinventory-turnover-calculator
Calculate inventory turnover, days sales in inventory, and annualized turnover.
2cr
Receivables Turnover Ratio Calculatorreceivables-turnover-ratio-calculator
Calculate receivables turnover and days sales outstanding.
2cr
Total Asset Turnover Calculatortotal-asset-turnover-calculator
Measure revenue generated per dollar of average total assets.
2cr
Financial Ratio
Goodwill to Assets Ratio Calculatorgoodwill-to-assets-ratio-calculator
Calculate goodwill-to-assets ratio and tangible asset share.
2cr
Retention Ratio Calculatorretention-ratio-calculator
Calculate retention ratio, payout ratio, and retained earnings.
2cr
Interest
APR Calculatorapr-calculator
Calculate true APR from loan amount, rolled-in fees, nominal rate, and term.
2cr
APR to APY Calculatorapr-to-apy-calculator
Convert APR to APY for a selected compounding frequency.
2cr
APY Calculatorapy-calculator
Calculate annual percentage yield and compound growth.
2cr
APY to APR Calculatorapy-to-apr-calculator
Convert APY back to nominal APR for a compounding frequency.
2cr
Compound Interest Calculatorcompound-interest-calculator
Compound-interest formula with selectable compounding frequency.
2cr
Continuous Compounding Calculatorcontinuous-compounding-calculator
Calculate future value and interest with continuous compounding.
1cr
Doubling Time Calculatordoubling-time-calculator
Calculate exact doubling time, Rule of 72 estimates, or the rate required to double.
1cr
Effective Interest Rate Calculatoreffective-interest-rate-calculator
Convert a nominal interest rate to its effective annual rate.
2cr
Effective Yield Calculatoreffective-yield-calculator
Calculate effective annual yield from nominal APR and compounding frequency.
2cr
Interest Rate Calculatorinterest-rate-calculator
Solve the implied annual interest rate from principal, term, and monthly payment.
2cr
Nominal Interest Rate Calculatornominal-interest-rate-calculator
Convert an effective annual rate to a nominal annual rate.
2cr
Simple Interest Calculatorsimple-interest-calculator
Simple-interest formula: I = P * r * t.
2cr
Investing
Stock Profit Loss Calculatorstock-profit-loss-calculator
Calculate stock trade profit, loss, ROI, and breakeven price.
2cr
Investment
Capital Employed Calculatorcapital-employed-calculator
Calculate capital employed by common balance-sheet methods and optional ROCE.
2cr
WACC Calculatorwacc-calculator
Calculate weighted average cost of capital and component contributions.
1cr
Leverage
Debt to Asset Ratio Calculatordebt-to-asset-ratio-calculator
Calculate debt-to-asset ratio, equity ratio, and optional industry benchmark spread.
2cr
Debt to Equity Ratio Calculatordebt-to-equity-ratio-calculator
Calculate debt-to-equity ratio, equity multiplier, and capital structure shares.
2cr
Equity Ratio Calculatorequity-ratio-calculator
Calculate equity ratio, debt ratio, equity multiplier, and industry benchmark spread.
2cr
Liquidity
Cash Ratio Calculatorcash-ratio-calculator
Calculate cash ratio from cash, marketable securities, and current liabilities.
2cr
Current Ratio Calculatorcurrent-ratio-calculator
Calculate current ratio and working capital from current assets and liabilities.
2cr
Loan to Deposit Ratio Calculatorloan-to-deposit-ratio-calculator
Calculate bank loan-to-deposit ratio, deposit coverage, and liquidity status.
2cr
Quick Ratio Calculatorquick-ratio-calculator
Calculate quick ratio, quick assets, current ratio, and liquidity rating.
2cr
Loan Calculators
Amortization Calculatoramortization-calculator
Calculate loan payment, interest, payoff timing, and savings from extra monthly principal.
1cr
HELOC Calculatorheloc-calculator
Estimate HELOC draw-period and repayment-period payments, interest cost, and combined loan-to-value.
1cr
Loans
Auto Loan Calculatorauto-loan-calculator
Calculate auto loan amount, monthly payment, tax, and total interest.
2cr
Business Loan Calculatorbusiness-loan-calculator
Estimate business loan payments, fees, payoff time, and interest.
2cr
Car Loan Payoff Calculatorcar-loan-payoff-calculator
Compare standard and accelerated payoff for a car loan.
2cr
Down Payment Calculatordown-payment-calculator
Estimate mortgage down payment, loan amount, monthly payment, PMI, and comparison scenarios.
2cr
EMI Calculatoremi-calculator
Calculate equated monthly installment and total interest for a loan.
2cr
Loan Payoff Calculatorloan-payoff-calculator
Calculate loan payoff months and savings from extra monthly payments.
2cr
Mortgage Calculatormortgage-calculator
Monthly payment, total interest, LTV, and optional amortization schedule.
5cr
Personal Loan Calculatorpersonal-loan-calculator
Calculate personal loan payment, payoff time, interest, and extra-payment savings.
2cr
Marketing
ROAS Calculatorroas-calculator
Calculate return on ad spend, profit, ROI, or target revenue.
2cr
Profit
Break-Even Calculatorbreak-even-calculator
Calculate break-even units, revenue, contribution margin, and target-profit units.
1cr
EBIT Calculatorebit-calculator
Calculate EBIT and EBIT margin from revenue, expenses, and non-operating income.
2cr
EBITDA Calculatorebitda-calculator
Calculate EBITDA using net income or operating income inputs.
2cr
Profitability
Cash Flow Margin Calculatorcash-flow-margin-calculator
Calculate operating cash flow margin as a percentage of net sales.
2cr
Earnings per Share Calculatorearnings-per-share-calculator
Calculate basic, diluted, or weighted earnings per share.
2cr
EBIT Margin Calculatorebit-margin-calculator
Calculate EBIT margin and EBIT-to-revenue ratio.
2cr
EBITDA Margin Calculatorebitda-margin-calculator
Calculate EBITDA margin from direct EBITDA or component inputs.
2cr
Gross Profit Margin Calculatorgross-profit-margin-calculator
Calculate gross profit, gross margin, markup, and cost ratio.
2cr
Net Profit Margin Calculatornet-profit-margin-calculator
Calculate net profit margin and profit per revenue dollar.
2cr
Operating Margin Calculatoroperating-margin-calculator
Calculate operating margin from operating income or detailed operating components.
2cr
Profit Calculatorprofit-calculator
Solve profit, margin, markup, revenue, or cost from the known values.
2cr
Profit to Sales Ratio Calculatorprofit-to-sales-ratio-calculator
Calculate profit-to-sales ratio and compare it with an industry benchmark.
2cr
Return on Assets Ratio Calculatorreturn-on-assets-ratio-calculator
Calculate ROA with optional DuPont margin and asset-turnover breakdown.
2cr
Return On Equity Calculatorreturn-on-equity-calculator
Calculate ROE with optional 3- or 5-component DuPont analysis.
2cr
Return On Sales Calculatorreturn-on-sales-calculator
Calculate return on sales, operating cost ratio, and ROS decimal.
2cr
Real Estate
Capitalization Rate Calculatorcapitalization-rate-calculator
Solve cap rate, property value, or required NOI for real estate income analysis.
2cr
Gross Rent Multiplier Calculatorgross-rent-multiplier-calculator
Calculate gross rent multiplier and rental yield for a property.
2cr
Home Equity Calculatorhome-equity-calculator
Calculate home equity, LTV, CLTV, and optional five-year equity projection.
2cr
Moving Cost Estimatormoving-cost-estimator
Estimate moving costs from home size, distance, service level, and access factors.
2cr
Real Estate Calculators
BRRRR Method Calculatorbrrrr-method-calculator
Analyze a BRRRR real estate deal, including all-in cost, refinance proceeds, capital recycled, equity, and cash flow.
1cr
Cash-on-Cash Return Calculatorcash-on-cash-return-calculator
Estimate rental property cash-on-cash return, cap rate, NOI, cash flow, and DSCR.
1cr
House Flipping Profit Calculatorhouse-flipping-profit-calculator
Estimate house flip net profit, ROI, financing effects, and the 70 percent rule threshold.
1cr
Housing Appreciation Calculatorhousing-appreciation-calculator
Calculate total home value change, annualized appreciation, and a future value projection.
1cr
Retail
Markup Calculatormarkup-calculator
Calculate markup percentage, selling price, cost, profit, and margin.
1cr
Return
Dividend Payout Ratio Calculatordividend-payout-ratio-calculator
Calculate dividend payout ratio and retention ratio from total or per-share inputs.
2cr
Dividend Yield Calculatordividend-yield-calculator
Calculate dividend yield, per-payment dividend, and optional annual income.
2cr
ROI Calculatorroi-calculator
Calculate ROI, annualized ROI, CAGR, and investment term from fixed dates.
2cr
Salary
Hourly to Salary Calculatorhourly-to-salary-calculator
Convert an hourly wage to weekly, monthly, and annual salary.
2cr
Hourly Wage Calculatorhourly-wage-calculator
Convert annual salary to equivalent hourly wage.
2cr
Salary Conversion Calculatorsalary-conversion-calculator
Convert wage amounts across hourly, daily, weekly, monthly, and annual pay periods.
2cr
Weekly Wage Calculatorweekly-wage-calculator
Convert annual salary to weekly wage.
2cr
Sales
Commission Calculatorcommission-calculator
Calculate flat, tiered, or bonus-based sales commission.
2cr
Savings
Compound Savings Calculatorcompound-savings-calculator
Project savings growth with compound interest and regular contributions.
1cr
TVM
Future Value Calculatorfuture-value-calculator
Calculate future value from a lump sum plus optional recurring contributions.
2cr
Future Value Factor Calculatorfuture-value-factor-calculator
Calculate the future value factor for a rate and number of periods.
2cr
Future Value of Annuity Calculatorfuture-value-of-annuity-calculator
Calculate future value for ordinary annuities and annuities due.
2cr
Future Value of Annuity Due Calculatorfuture-value-of-annuity-due-calculator
Calculate future value of an annuity due and compare it with an ordinary annuity.
2cr
Future Value of Growing Annuity Calculatorfuture-value-of-growing-annuity-calculator
Calculate future value for payments that grow each period.
2cr
Future Value of Lump Sum Calculatorfuture-value-of-lump-sum-calculator
Calculate compound future value for a single lump-sum investment.
2cr
FVIFA Calculatorfvifa-calculator
Calculate the future value interest factor of an annuity.
2cr
Present Value of Annuity Calculatorpresent-value-of-annuity-calculator
Calculate present value for ordinary annuities and annuities due.
2cr
Present Value of Lump Sum Calculatorpresent-value-of-lump-sum-calculator
Discount a future lump sum back to present value.
2cr
Tax
VAT Calculatorvat-calculator
Add, remove, or extract VAT from an amount using a preset or custom rate.
2cr
Valuation
Book Value per Share Calculatorbook-value-per-share-calculator
Calculate book value per share, common equity, and optional price-to-book ratio.
2cr
P/E Ratio Calculatorp-e-ratio-calculator
Calculate price-to-earnings ratio, earnings yield, and sector benchmark premium.
2cr
Price to Book Ratio Calculatorprice-to-book-ratio-calculator
Calculate price-to-book ratio and compare it to industry benchmark ranges.
2cr

Text 30 endpoints full page →

Word / character / line counters, whitespace, case, encoding.

Analysis
Character Countercharacter-counter
Count characters, letters, digits, whitespace, and punctuation.
1cr
Compare Two Stringscompare-two-strings
Compare two strings with equality, similarity, edit distance, and diff statistics.
1cr
Find Longest Linefind-longest-line
Rank text lines by character, word, or byte length and return the longest lines.
1cr
Line Counterline-counter
Count total / non-empty / empty lines and longest-line length.
1cr
Pangram Checkerpangram-checker
Check whether text contains every letter A through Z.
1cr
Sentence Countersentence-counter
Count sentences and classify sentence type and basic complexity.
1cr
Word Counterword-counter
Count words, characters, sentences, paragraphs, reading/speaking time, top words.
1cr
CSS
CSS Beautifiercss-beautifier
Format compact CSS with indentation and line breaks.
1cr
Case
Text Case Converterlowercase-uppercase-letters
Convert text to uppercase, lowercase, title, sentence, camel, snake, kebab, and related cases.
1cr
Title Case Convertertitle-case-converter
Convert text to title case using smart, APA, Chicago, MLA, AP, or simple capitalization rules.
1cr
Deduplication
Remove Duplicate Linesremove-duplicate-lines
Remove duplicate text lines while keeping first, last, or only unique occurrences.
1cr
Encoding
Morse Code Generatormorse-code-generator
Convert text to International Morse code with character breakdown.
1cr
Formatting
ASCII Art Generatorascii-art-generator
Generate deterministic ASCII banner art from short text.
1cr
Lists
List Difference Calculatorlist-difference-calculator
Compare two line-based lists and return differences, intersection, and union.
1cr
Modification
Add Line Numbersadd-line-numbers
Add configurable line numbers to the start or end of each text line.
1cr
Add Prefix and Suffixadd-prefix-and-suffix
Add prefix, suffix, and optional numbering to each text line, word, or delimited item.
1cr
Remove Accentremove-accent
Remove accents and combining marks from Unicode text.
1cr
Remove Line Numbersremove-line-numbers
Strip numeric prefixes such as line numbers from each line of text.
1cr
Remove Lines Containingremove-lines-containing
Keep or remove lines matching a text, word, prefix, suffix, or regex pattern.
1cr
Remove Punctuationremove-punctuation
Remove or replace selected punctuation categories from text.
1cr
Reverse Textreverse-text
Reverse whole text, word order, each word, or line order.
1cr
Sorting
Sort Lines Alphabeticallysort-lines-alphabetically
Sort text lines alphabetically, naturally, numerically, or by length.
1cr
Subtitles
CSV to SRT Convertercsv-to-srt
Convert CSV subtitle rows with start, end, and text columns to SRT.
1cr
Text Conversion
Word to Phone Number Converterword-to-phone-number-converter
Convert words and phrases into T9 keypad phone numbers.
1cr
Text Modification
Text Repeattext-repeat
Repeat text multiple times with separators, numbering, and case options.
1cr
Upside Down Text Generatorupside-down-text-generator
Flip text upside down using Unicode character mappings.
1cr
Text Statistics
Word Frequency Analyzerword-frequency-analyzer
Analyze word frequency, unique words, lexical diversity, and CSV output.
1cr
Whitespace
Remove Empty Linesremove-empty-lines
Remove blank or whitespace-only lines from text and report line reduction statistics.
1cr
Remove Leading Trailing Spacesremove-leading-trailing-spaces
Trim leading and trailing spaces or tabs from each line.
1cr
Remove Spacesremove-spaces
Strip whitespace: all, extra, leading, trailing, or per-line.
1cr

Hash & Checksum 6 endpoints full page →

SHA, MD5, HMAC, and digest utilities with stable JSON output.

BLAKE2b Hash Generatorblake2b-hash-generator
Generate a BLAKE2b digest with 256, 384, or 512-bit output.
1cr
MD5 Hash Generatormd5-hash-generator
Generate an MD5 hex digest for checksum and legacy compatibility.
1cr
SHA-256 Hash Generatorsha256-hash-generator
Generate a SHA-256 hex digest of a UTF-8 string.
1cr
SHA3-512 Hash Generatorsha3-512-hash-generator
Generate a SHA3-512 hex digest of a UTF-8 string.
1cr
SHA-384 Hash Generatorsha384-hash-generator
Generate a SHA-384 hex digest of a UTF-8 string.
1cr
SHA-512 Hash Generatorsha512-hash-generator
Generate a SHA-512 hex digest of a UTF-8 string.
1cr

Math 215 endpoints full page →

Percentage, unit conversion, geometry, and sequences.

Advanced
Complementary Error Function Calculatorcomplementary-error-function-calculator
Calculate erf(x), erfc(x), and related error-function values.
1cr
Exponential Decay Calculatorexponential-decay-calculator
Solve continuous exponential decay equations for final amount, initial amount, rate, or time.
1cr
Exponential Growth Calculatorexponential-growth-calculator
Solve continuous exponential growth equations for final amount, initial amount, rate, or time.
1cr
Advanced Math
Antilog Calculatorantilog-calculator
Calculate an antilogarithm as base raised to an exponent.
1cr
Algebra
Absolute Value Equation Solverabsolute-value-equation-solver
Solve equations of the form |a*x + b| = c.
1cr
Absolute Value Inequality Solverabsolute-value-inequality-solver
Solve inequalities of the form |a*x + b| compared with c.
1cr
Completing the Square Calculatorcompleting-the-square-calculator
Convert a quadratic to vertex form and solve by completing the square.
1cr
Cubic Equation Solvercubic-equation-solver
Solve ax^3 + bx^2 + cx + d = 0 and return all real or complex roots.
1cr
Slope Intercept Form Calculatorslope-intercept-form-calculator
Build slope-intercept and standard-form line equations from m and b.
1cr
Square Root Calculatorsquare-root-calculator
Calculate the principal and negative square roots of a non-negative number.
1cr
X and Y Intercept Calculatorx-y-intercept-calculator
Find x- and y-intercepts for a linear equation ax + by + c = 0.
1cr
Angles
Radian to Degree Converterradian-to-degree-converter
Convert radians, fractions, or pi expressions to degrees.
1cr
Area
Acreage Calculatoracreage-calculator
Calculate land acreage from rectangle, triangle, or circle dimensions.
1cr
Hectares to Acres Converterhectares-to-acres-converter
Convert hectares to acres and related land-area units.
1cr
Square Feet to Acres Convertersquare-feet-to-acres-converter
Convert square feet to acres and related land-area units.
1cr
Square Footage Calculatorsquare-footage-calculator
Calculate square footage for common room, lot, and curved shapes.
1cr
Square Meters to Acres Convertersquare-meters-to-acres-converter
Convert square meters to acres and related land-area units.
1cr
Square Miles to Acres Convertersquare-miles-to-acres-converter
Convert square miles to acres and related land-area units.
1cr
Basic Math
Absolute Value Calculatorabsolute-value-calculator
Calculate the absolute value of a real or complex number.
1cr
Cube and Cube Root Calculatorcube-and-cube-root-calculator
Calculate a number's cube and cube root.
1cr
Cube Root Calculatorcube-root-calculator
Calculate the real cube root of a finite number.
1cr
Even or Odd Number Checkereven-or-odd-number-checker
Check whether one or more integers are even or odd.
1cr
Charts
Bar Graph Makerbar-graph-maker
Prepare normalized bar-chart data from labels and numeric values.
1cr
Combinatorics
Binomial Coefficient Calculatorbinomial-coefficient-calculator
Calculate C(n, k), the number of combinations choosing k items from n.
1cr
Combination Calculatorcombination-calculator
Calculate combinations C(n, k).
1cr
Complex Numbers
Complex Numbers Calculatorcomplex-numbers-calculator
Add, subtract, multiply, or divide two complex numbers.
1cr
Conics
Hyperbola Calculatorhyperbola-calculator
Calculate standard-form hyperbola vertices, foci, eccentricity, and asymptotes.
1cr
Construction
Flooring Calculatorflooring-calculator
Estimate flooring material units, waste allowance, and optional cost.
1cr
Insulation Calculatorinsulation-calculator
Estimate insulation R-value target, thickness, material quantity, and cost range.
1cr
Cooking
Butter to Oil Converterbutter-to-oil-converter
Convert butter quantities to practical oil equivalents for baking.
1cr
Education
Final Grade Calculatorfinal-grade-calculator
Calculate the final exam score needed to reach a target course grade.
1cr
Electronics
LED Resistor Calculatorled-resistor-calculator
Calculate LED current-limiting resistor values and power ratings.
1cr
Exponents
Half Life Calculatorhalf-life-calculator
Solve exponential decay for remaining amount, initial amount, elapsed time, or half-life.
1cr
Fractions
Comparing Fractions Calculatorcomparing-fractions-calculator
Compare two fractions or mixed numbers using a common denominator.
1cr
Decimal to Fraction Calculatordecimal-to-fraction-calculator
Convert a decimal or parenthesized repeating decimal to a fraction.
1cr
Equivalent Fractions Calculatorequivalent-fractions-calculator
Generate equivalent fractions or check whether two fractions are equivalent.
1cr
Fraction Simplifierfraction-simplifier
Reduce a fraction to lowest terms and return GCF, mixed number, decimal, percentage, and equivalents.
1cr
Fraction to Decimal Calculatorfraction-to-decimal-calculator
Convert proper, improper, or mixed fractions to decimals and detect repeating decimal patterns.
1cr
Fraction to Mixed Number Converterfraction-to-mixed-number-converter
Convert an improper fraction to a simplified mixed number.
1cr
Fraction to Percent Converterfraction-to-percent-converter
Convert proper, improper, or mixed fractions to percentages with configurable decimal places.
1cr
Mixed Number to Fraction Convertermixed-number-to-fraction-converter
Convert a mixed number to an improper fraction and simplified form.
1cr
Functions
Hyperbolic Functions Calculatorhyperbolic-functions-calculator
Calculate sinh, cosh, tanh and reciprocal hyperbolic functions.
1cr
Games
DPS Calculatordps-calculator
Calculate raw, sustained, critical-hit, and headshot damage per second.
1cr
Geometry
3D Distance Calculator3d-distance-calculator
Calculate 3D Euclidean distance, midpoint, direction cosines, and related distances.
1cr
Angle Bisector Calculatorangle-bisector-calculator
Calculate triangle angle bisectors, angles, area, and inradius from side lengths.
1cr
Arc Length Calculatorarc-length-calculator
Solve arc length, radius, or central angle for a circle sector.
1cr
Area of a Circle Calculatorarea-of-a-circle-calculator
Calculate circle radius, diameter, circumference, and area from one value.
1cr
Area of a Parallelogram Calculatorarea-of-a-parallelogram-calculator
Find parallelogram area from base-height, sides-angle, or diagonals-angle inputs.
1cr
Area of a Sector Calculatorarea-of-a-sector-calculator
Calculate sector area, arc length, perimeter, chord, and segment area.
1cr
Area of a Trapezoid Calculatorarea-of-a-trapezoid-calculator
Calculate trapezoid area from two parallel bases and height.
1cr
Area of an Ellipse Calculatorarea-of-an-ellipse-calculator
Calculate ellipse area, Ramanujan perimeter, foci, and eccentricity.
1cr
Area of Equilateral Triangle Calculatorarea-of-equilateral-triangle-calculator
Calculate equilateral-triangle side, area, height, perimeter, and radii.
1cr
Cartesian to Polar Coordinates Convertercartesian-to-polar-converter
Convert Cartesian x-y coordinates to polar radius and angle.
1cr
Circle Calculatorcircle-calculator
Calculate circle radius, diameter, circumference, area, and optional arc/sector values.
1cr
Circumscribed Circle Circumcircle Calculatorcircumscribed-circle-circumcircle-calculator
Calculate the circumcircle of a triangle from side lengths or coordinates.
1cr
Cone Flat Pattern Template Generatorcone-flat-pattern-template-generator
Calculate unrolled cone or frustum flat-pattern dimensions.
1cr
Conic Section Identifierconic-section-identifier
Classify a general second-degree equation as a conic section.
1cr
Coordinate Geometry Distance Calculatorcoordinate-geometry-distance-calculator
Calculate distance, midpoint, slope, and line equations between two points.
1cr
Distance Between Two Points Calculatordistance-between-two-points-calculator
Calculate 2D point distance, midpoint, slope, and line equation.
1cr
Ellipse Circumference Calculatorellipse-circumference-calculator
Calculate ellipse circumference with several common approximations.
1cr
Euler Characteristic Calculatoreuler-characteristic-calculator
Calculate Euler characteristic V - E + F and classify common surfaces.
1cr
Frustum Calculatorfrustum-calculator
Calculate volume and surface area for a conical frustum.
1cr
Golden Ratio Calculatorgolden-ratio-calculator
Calculate golden-ratio segments from total, larger, or smaller segment.
1cr
Golden Rectangle Calculatorgolden-rectangle-calculator
Calculate golden rectangle dimensions, area, perimeter, and aspect ratio.
1cr
Golden Section Calculatorgolden-section-calculator
Find the golden-section points within an interval.
1cr
Great Circle Distance Calculatorgreat-circle-distance-calculator
Calculate great-circle distance, bearing, and midpoint between two coordinates.
1cr
Heron's Formula Calculatorheron-s-formula-calculator
Calculate triangle area from three side lengths using Heron's formula.
1cr
Hypotenuse Calculatorhypotenuse-calculator
Calculate the hypotenuse and basic right-triangle measures from two legs.
1cr
Midpoint Calculatormidpoint-calculator
Find the midpoint, distance, slope, and angle between two points.
1cr
Pythagorean Theorem Calculatorpythagorean-theorem-calculator
Find a missing right-triangle side and calculate area, perimeter, and angles.
1cr
Rectangle Calculatorrectangle-calculator
Calculate rectangle area, perimeter, diagonal, radii, and aspect ratio from two known values.
1cr
Regular Polygon Calculatorregular-polygon-calculator
Calculate regular polygon area, perimeter, apothem, circumradius, angles, and diagonal count.
1cr
Slope Calculatorslope-calculator
Calculate slope, angle, intercepts, and line equation from two points.
1cr
Square Calculatorsquare-calculator
Calculate square side length, area, perimeter, diagonal, inradius, and circumradius from one known value.
1cr
Geometry Calculators
Torus Calculatortorus-calculator
Calculate torus volume, surface area, and key radii.
1cr
Home
Aquarium Substrate Calculatoraquarium-substrate-calculator
Estimate aquarium substrate volume, weight, and bag counts.
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Length
Feet and Inches to Cm Converterfeet-and-inches-to-cm-converter
Convert feet and inches to total inches, centimeters, meters, and height comparison percentages.
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Linear Algebra
Angle Between Vectors Calculatorangle-between-vectors-calculator
Calculate the angle between two 2D or 3D vectors.
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Characteristic Polynomial Calculatorcharacteristic-polynomial-calculator
Calculate characteristic polynomial coefficients for a square matrix.
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Cholesky Decomposition Calculatorcholesky-decomposition-calculator
Decompose a symmetric positive-definite matrix into A = L L^T.
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Column Space Calculatorcolumn-space-calculator
Find matrix pivot columns, rank, nullity, RREF, and a column-space basis.
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Cramer's Rule Calculatorcramer-s-rule-calculator
Solve 2x2 or 3x3 linear systems with Cramer's rule.
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Cross Product Calculatorcross-product-calculator
Calculate the 3D cross product, magnitude, areas, and angle.
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Determinant Calculatordeterminant-calculator
Calculate the determinant, trace, rank, and invertibility of a square matrix.
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Dot Product Calculatordot-product-calculator
Calculate the dot product, magnitudes, angle, and vector projection.
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Unit Vector Calculatorunit-vector-calculator
Normalize a vector and return its unit vector.
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Vector Magnitude Calculatorvector-magnitude-calculator
Calculate the Euclidean magnitude and unit vector for any vector.
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Vector Projection Calculatorvector-projection-calculator
Project one vector onto another and compute the orthogonal component.
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Logarithms
Log Base 10 Calculatorlog-base-10-calculator
Calculate common logarithms with bounds and an antilog check.
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Log Base 2 Calculatorlog-base-2-calculator
Calculate binary logarithms and detect exact powers of two.
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Number Systems
Base Converterbase-converter
Convert integers between bases 2 through 36.
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Base-N Calculatorbase-n-calculator
Convert an integer from any base 2 through 36 to every other base.
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BCD to Binary Converterbcd-to-binary-converter
Convert 8421 BCD nibbles to decimal and binary.
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BCD to Decimal Converterbcd-to-decimal-converter
Convert binary-coded decimal nibbles to a decimal integer.
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BCD to Hex Converterbcd-to-hex-converter
Convert BCD to hexadecimal or hexadecimal to BCD.
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Binary Calculatorbinary-calculator
Run binary arithmetic and bitwise operations.
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Binary to BCD Converterbinary-to-bcd-converter
Convert an integer binary value to binary-coded decimal.
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Binary to Decimal Converterbinary-to-decimal-converter
Convert a binary number to decimal, hexadecimal, and octal.
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Binary to Gray Code Converterbinary-to-gray-code-converter
Convert an integer binary value to Gray code.
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Binary to Hex Converterbinary-to-hex-converter
Convert a binary number to hexadecimal with nibble grouping.
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Binary to Octal Converterbinary-to-octal-converter
Convert a binary number to octal using 3-bit grouping.
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Decimal to Binary Converterdecimal-to-binary-converter
Convert a decimal integer to binary with grouped bits and division steps.
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Decimal to Hex Converterdecimal-to-hex-converter
Convert a decimal integer to hexadecimal with conversion steps.
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Decimal to Octal Converterdecimal-to-octal-converter
Convert a base-10 integer to octal with division steps.
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Decimal to Scientific Notation Converterdecimal-to-scientific-notation-converter
Convert decimal numbers to scientific, E, and engineering notation.
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Gray Code to Binary Convertergray-code-to-binary-converter
Convert Gray code to ordinary binary with XOR steps.
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Hex to BCD Converterhex-to-bcd-converter
Convert a hexadecimal integer to binary-coded decimal.
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Hex to Binary Converterhex-to-binary-converter
Convert a hexadecimal integer to binary.
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Hex to Decimal Converterhex-to-decimal-converter
Convert a hexadecimal integer to decimal with digit breakdown.
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Hex to Octal Converterhex-to-octal-converter
Convert a hexadecimal integer to octal through binary grouping.
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Octal to Binary Converteroctal-to-binary-converter
Convert an octal integer to binary with per-digit mapping.
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Octal to Decimal Converteroctal-to-decimal-converter
Convert an octal integer to decimal with positional breakdown.
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Ratio to Percentage Calculatorratio-to-percentage-calculator
Convert ratios, fractions, or decimal divisions to percentages.
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Scientific Notation to Decimal Converterscientific-notation-to-decimal-converter
Convert scientific notation to ordinary decimal notation.
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Number Theory
Factorial Calculatorfactorial-calculator
Calculate factorial metadata, exact values for bounded inputs, and scientific notation.
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Fibonacci Number Checkerfibonacci-number-checker
Check whether a non-negative integer is in the Fibonacci sequence.
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Goldbach Conjecture Verifiergoldbach-conjecture-verifier
Verify an even integer by finding prime pairs that sum to it.
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Percentage
Decimal to Percent Converterdecimal-to-percent-converter
Convert one or more decimal numbers to percentages.
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Percentage Calculatorpercentage-calculator
Six percentage operations behind one endpoint, selected by mode.
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Percentage Error Calculatorpercentage-error-calculator
Calculate percent error between estimated and actual values.
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Physics
Acceleration Calculatoracceleration-calculator
Calculate acceleration from velocity change, distance, force, centripetal motion, or free fall.
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Horsepower Calculatorhorsepower-calculator
Solve horsepower, torque, or RPM and return common power conversions.
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Probability
Binomial Probability Distribution Calculatorbinomial-probability-distribution-calculator
Calculate exact and cumulative binomial probabilities.
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Dice Roll Probability Calculatordice-roll-probability-calculator
Calculate exact probability metrics for sums of identical dice.
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Ratios
Aspect Ratio Calculatoraspect-ratio-calculator
Simplify dimensions to a ratio, derive dimensions from a ratio, or resize proportionally.
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Unit Rate Calculatorunit-rate-calculator
Calculate a unit rate or compare two unit rates.
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Sequence Tools
Catalan Number Generatorcatalan-number-generator
Calculate the nth Catalan number and nearby sequence values.
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Collatz Conjecture Calculatorcollatz-conjecture-calculator
Generate and analyze the deterministic Collatz hailstone sequence.
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Sequences
Arithmetic Sequence Calculatorarithmetic-sequence-calculator
Calculate the nth term and partial sum of an arithmetic sequence.
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Geometric Sequence Calculatorgeometric-sequence-calculator
Calculate nth term, partial sum, and sample terms for a geometric sequence.
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Happy Number Calculatorhappy-number-calculator
Check whether a number is happy or list happy numbers up to a limit.
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Sum of Cubes Calculatorsum-of-cubes-calculator
Calculate 1^3 + 2^3 + ... + n^3.
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Sum of Squares Calculatorsum-of-squares-calculator
Calculate 1^2 + 2^2 + ... + n^2.
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Sports
Bike Gear Ratio Calculatorbike-gear-ratio-calculator
Calculate bicycle gear ratio, gear inches, rollout, gain ratio, and speed.
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Cricket Run Rate Calculatorcricket-run-rate-calculator
Calculate current, projected, and required cricket run rates from cricket over notation.
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Usage Rate Calculatorusage-rate-calculator
Calculate basketball usage rate from player and team shot, free throw, turnover, and minute stats.
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Statistics
ANOVA Calculatoranova-calculator
Run one-way ANOVA with F statistic, p-value, table components, and effect sizes.
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Arithmetic Mean Calculatorarithmetic-mean-calculator
Calculate arithmetic mean, median, modes, range, variance, and standard deviation from a number list.
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Average Calculatoraverage-calculator
Calculate mean, median, mode, range, variance, and optional weighted average.
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Average Deviation Calculatoraverage-deviation-calculator
Calculate mean and median absolute deviation for a numeric dataset.
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Coefficient of Variation Calculatorcoefficient-of-variation-calculator
Calculate coefficient of variation from sample or population standard deviation.
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Cohen's d Calculatorcohens-d-calculator
Calculate Cohen's d, Hedges' g, overlap, and effect-size interpretation.
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Correlation Coefficient Calculatorcorrelation-coefficient-calculator
Calculate Pearson, Spearman, and Kendall correlation coefficients.
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Find Minimum and Maximumfind-minimum-maximum
Find min, max, range, mean, median, positions, and sorted values for a number list.
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Five Number Summary Calculatorfive-number-summary-calculator
Calculate minimum, Q1, median, Q3, maximum, IQR, and outlier fences.
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Geometric Mean Calculatorgeometric-mean-calculator
Calculate geometric mean and compare it with arithmetic, harmonic, median, minimum, and maximum values.
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Harmonic Mean Calculatorharmonic-mean-calculator
Calculate harmonic mean for positive non-zero values with comparison means and reciprocal totals.
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Interquartile Range Calculatorinterquartile-range-calculator
Calculate IQR, quartiles, and 1.5-IQR outlier fences.
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Mean Calculatormean-calculator
Calculate arithmetic mean and supporting summary statistics.
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Median Calculatormedian-calculator
Calculate the median, sorted data, quartiles, and range.
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Midrange Calculatormidrange-calculator
Calculate the midpoint between the minimum and maximum of a dataset.
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Mode Calculatormode-calculator
Find the mode or modes and frequency table for a numeric dataset.
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Outlier Calculatoroutlier-calculator
Detect IQR outliers and return quartiles, bounds, and counts.
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Population Variance Calculatorpopulation-variance-calculator
Calculate population variance and population standard deviation.
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Quartile Calculatorquartile-calculator
Calculate Q1, Q2, Q3, IQR, and outlier fences using a selected quartile method.
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Root Mean Square Calculatorroot-mean-square-calculator
Calculate root mean square for a numeric list.
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Sample Standard Deviation Calculatorsample-standard-deviation-calculator
Calculate sample standard deviation and optional z-score outliers.
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Sample Variance Calculatorsample-variance-calculator
Calculate sample or population variance from a numeric dataset.
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Standard Deviation Calculatorstandard-deviation-calculator
Calculate sample and population standard deviation with quartiles.
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Variance Calculatorvariance-calculator
Calculate sample and population variance with related statistics.
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Weibull Distribution Calculatorweibull-distribution-calculator
Calculate Weibull PDF/CDF/reliability, moments, and B-life values.
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Z-Score Calculatorzscore-calculator
Calculate z-scores, inverse values, percentiles, and normal probabilities.
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Surface Area
Surface Area of a Cone Calculatorsurface-area-of-a-cone-calculator
Calculate cone base, lateral, and total surface area from radius-height, radius-slant, or diameter-height inputs.
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Surface Area of a Cube Calculatorsurface-area-of-a-cube-calculator
Calculate cube surface area and related measurements from edge, diagonal, volume, or surface area.
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Trigonometry
Arccos Calculatorarccos-calculator
Calculate inverse cosine in radians and degrees.
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Arcsin Calculatorarcsin-calculator
Calculate arcsine from a sine value, including degree/radian output and special-angle recognition.
1cr
Arctan Calculatorarctan-calculator
Calculate inverse tangent in radians and degrees.
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Arctan2 Calculatorarctan2-calculator
Calculate atan2(y, x), normalized angle, radius, slope, and quadrant.
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Cosine Calculatorcosine-calculator
Calculate cosine with radians/degrees conversion, quadrant, and special-angle recognition.
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Cosecant/Secant/Cotangent Calculatorcsc-sec-cot-calculator
Calculate csc, sec, cot, sine, and cosine for an angle.
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Degree to Radian Converterdegree-to-radian-converter
Convert degrees to radians with pi-fraction, quadrant, and trig values.
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DMS to Decimal Degrees Converterdms-to-decimal-converter
Convert degrees, minutes, and seconds to signed decimal degrees.
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Law of Cosines Calculatorlaw-of-cosines-calculator
Use the law of cosines to solve a side or included angle.
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Law of Sines Calculatorlaw-of-sines-calculator
Use the law of sines to solve a side or possible angle.
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Sine Calculatorsine-calculator
Calculate sine with radians/degrees conversion, quadrant, and special-angle recognition.
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Tangent Calculatortangent-calculator
Calculate tangent and flag vertical-asymptote inputs.
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Unit Converters
Acres to Hectares Converteracres-to-hectares-converter
Convert between acres and hectares with related area units.
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Acres to Perches Converteracres-to-perches-converter
Convert acres and perches for land area calculations.
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Acres to Square Feet Converteracres-to-square-feet-converter
Convert between acres and square feet with related area units.
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Acres to Square Meters Converteracres-to-square-meters-converter
Convert between acres and square meters with related area units.
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Acres to Square Miles Converteracres-to-square-miles-converter
Convert acres and square miles, including related land-area units.
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Acres to Square Yards Converteracres-to-square-yards-converter
Convert acres and square yards, including related area units.
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Angle Converterangle-converter
Convert angles between degrees, radians, gradians, turns, arcminutes, arcseconds, and milliradians.
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CM to Inches Convertercm-to-inches-converter
Convert centimeters to inches, feet/inches, and nearest 1/16-inch fraction.
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Cups to Tablespoons Convertercups-to-tablespoons-converter
Convert US cups and tablespoons, including teaspoons and fluid ounces.
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Feet to Meters Converterfeet-to-meters-converter
Convert feet and optional inches to meters, centimeters, and millimeters.
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Gallons to Cups Convertergallons-to-cups-converter
Convert US gallons and cups, with quart and pint equivalents.
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Grams to Ounces Convertergrams-to-ounces-converter
Convert grams to ounces, pounds, kilograms, and milligrams.
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Grams to Pounds Convertergrams-to-pounds-converter
Convert grams to pounds, ounces, and kilograms.
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Inches to CM Converterinches-to-cm-converter
Convert inches to centimeters, millimeters, meters, and feet.
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kg to lbs Converterkg-to-lbs-converter
Convert kilograms and pounds with ounce breakdown.
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kPa to psi Converterkpa-to-psi-converter
Convert kilopascals to psi, bar, atm, and mmHg.
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Liters to Cups Converterliters-to-cups-converter
Convert liters to US, metric, and imperial cups.
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Meters to Feet Convertermeters-to-feet-converter
Convert meters to decimal feet and feet-and-inches.
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Ounce to Gram Converterounce-to-gram-converter
Convert ounces to grams, kilograms, milligrams, and pounds.
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Ounces to Cups Converterounces-to-cups-converter
Convert US fluid ounces and cups with spoon and milliliter equivalents.
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Percent to PPM Converterpercent-to-ppm-converter
Convert percent to ppm or ppm to percent.
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Perches to Acres Converterperches-to-acres-converter
Convert perches and acres for land area calculations.
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Pounds to Grams Converterpounds-to-grams-converter
Convert pounds to grams, kilograms, ounces, and milligrams.
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PPM to Percent Converterppm-to-percent-converter
Convert parts per million to percentage and related concentration scales.
1cr
Square Yards to Acres Convertersquare-yards-to-acres-converter
Convert square yards and acres, including related area units.
1cr
Tablespoons to Cups Convertertablespoons-to-cups-converter
Convert US tablespoons to cups, teaspoons, fluid ounces, and milliliters.
1cr
Tablespoons to Teaspoons Convertertablespoons-to-teaspoons-converter
Convert US tablespoons to teaspoons, cups, fluid ounces, and milliliters.
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Teaspoons to Cups Converterteaspoons-to-cups-converter
Convert US teaspoons and cups, including tablespoons and fluid ounces.
1cr
Teaspoons to Tablespoons Converterteaspoons-to-tablespoons-converter
Convert US teaspoons to tablespoons, cups, fluid ounces, and milliliters.
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Volume
Cups to Gallons Convertercups-to-gallons-converter
Convert US cups and gallons with related volume units.
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Cups to Liters Convertercups-to-liters-converter
Convert US cups and liters with milliliter, fluid-ounce, and spoon equivalents.
1cr
Cups to Ounces Convertercups-to-ounces-converter
Convert cups and fluid ounces for US customary, US legal, imperial, or metric cups.
1cr
Cups to Quarts Convertercups-to-quarts-converter
Convert US cups and quarts with related volume units.
1cr
Cups to Teaspoons Convertercups-to-teaspoons-converter
Convert US cups and teaspoons with tablespoon and fluid-ounce equivalents.
1cr
Volume of a Cone Calculatorvolume-of-a-cone-calculator
Calculate cone volume, slant height, base area, lateral area, and total surface area.
1cr
Volume of a Cube Calculatorvolume-of-a-cube-calculator
Calculate cube volume, surface area, face area, diagonals, and total edge length.
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Volume of a Pyramid Calculatorvolume-of-a-pyramid-calculator
Calculate volume, base area, slant height, and surface area for square, rectangular, or triangular pyramids.
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Volume of a Rectangular Prism Calculatorvolume-of-a-rectangular-prism-calculator
Calculate rectangular prism volume, surface area, diagonals, base perimeter, and total edge length.
1cr
Volume of Ellipsoid Calculatorvolume-of-ellipsoid-calculator
Calculate ellipsoid volume, approximate surface area, cross sections, equivalent sphere radius, and shape type.
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Random 12 endpoints full page →

Random generators for apps, tests, and automations.

Cards
Random Playing Card Generatorrandom-playing-card-generator
Draw random playing cards from a standard deck with optional jokers.
1cr
Color
Random Color Generatorrandom-color-generator
Generate random HEX, RGB, and HSL colors with optional harmony rules.
1cr
Date
Random Date Generatorrandom-date-generator
Generate random dates inside a bounded date range.
1cr
Lists
List Randomizerlist-randomizer
Shuffle a newline-separated list into random order.
1cr
Random Group Generatorrandom-group-generator
Create random balanced groups from a newline-separated list of names.
1cr
Random Line Pickerrandom-line-picker
Pick random non-empty lines from user-supplied text.
1cr
Network
Random Port Number Generatorrandom-port-number-generator
Generate random network port numbers in standard or custom ranges.
1cr
Numbers
Random Decimal Number Generatorrandom-decimal-number-generator
Generate random decimal numbers between 0 and 1 with configurable precision.
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Random Integer Generatorrandom-integer-generator
Generate random integers with optional uniqueness, sorting, exclusions, and seed replay.
1cr
Quotes
Random Quote Generatorrandom-quote-generator
Generate or search quotes from a bundled SQLite quote database.
3cr
Text
Random Letter Generatorrandom-letter-generator
Generate random letters with case, vowel/consonant, and duplicate controls.
1cr
Random String Generatorrandom-string-generator
Generate random strings, passwords, API keys, tokens, PINs, or hex strings.
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Webmaster 8 endpoints full page →

DNS, HTTP, meta, robots, and other webmaster utilities.

Advertising
CPC Calculatorcpc-calculator
Calculate CPC, CPM, or CTR from two known campaign metrics.
1cr
CPM Calculatorcpm-calculator
Calculate campaign cost, CPM, or impressions from two known advertising metrics.
1cr
Analytics
Value of A Visitor Calculatorvalue-of-a-visitor-calculator
Calculate website visitor value, conversion rate, annualized revenue, and traffic ROI.
2cr
CSS
CSS Box Shadow Generatorcss-box-shadow-generator
Generate a CSS box-shadow declaration from numeric shadow controls.
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CSS Compressorcss-compressor
Minify CSS and return compression statistics.
1cr
Encoding
JSON String Escape/Unescapejson-string-escape-unescape
Escape or unescape JSON string content deterministically.
1cr
IP
IP Address to Binary Converterip-address-to-binary-converter
Convert IPv4 or IPv6 addresses to padded binary forms.
1cr
SEO
URL Slug Generatorurl-slug-generator
Generate an SEO-friendly URL slug from a title or phrase.
1cr

Color 3 endpoints full page →

Accessibility
Color Contrast Checkercolor-contrast-checker
Check WCAG contrast ratio and AA/AAA compliance for two colors.
1cr
Conversion
Color Code Convertercolor-code-converter-all-formats
Convert HEX, RGB, HSL, HSV, CMYK, and common CSS named colors.
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Palette
Color Scheme Generatorcolor-scheme-generator
Generate complementary, analogous, triadic, square, tetradic, and monochromatic palettes.
1cr

Construction 5 endpoints full page →

Lumber
Board Foot Calculatorboard-foot-calculator
Calculate lumber volume in board feet, cubic volume, weight, and optional cost.
1cr
Materials
Carpet Calculatorcarpet-calculator
Estimate carpet area, waste, roll length, padding, installation, and cost.
1cr
Decking Calculatordecking-calculator
Estimate decking boards, joists, beams, posts, fasteners, and waste.
1cr
Tile Calculatortile-calculator
Estimate tile count, boxes, grout, adhesive, sealer, waste, and optional cost.
1cr
Wallpaper Calculatorwallpaper-calculator
Estimate wallpaper drops, rolls, waste, coverage, and optional cost.
1cr

Conversion 1 endpoint full page →

Fuel Efficiency Converterfuel-efficiency-converter-mpg-l-100km-km-l
Convert MPG, L/100km, km/L, and miles/L fuel-efficiency values.
1cr

Converters 1 endpoint full page →

Torque Convertertorque-converter-nm-ft-lb-kgf-cm
Convert torque between Nm, ft-lb, in-lb, kgf-cm, kgf-m, dyn-cm, oz-in, and oz-ft.
1cr

Cooking 8 endpoints full page →

Baking
Baking Pan Size Converterbaking-pan-size-converter
Scale a recipe when switching between common baking pan sizes.
1cr
Dough Hydration Calculatordough-hydration-calculator
Calculate dough hydration, required water, or a simple baker's percentage recipe.
1cr
Coffee
Coffee Brew Ratio Calculatorcoffee-brew-ratio-calculator
Calculate coffee and water amounts for common brewing methods and strengths.
1cr
Conversion
Cooking Unit Convertercooking-unit-converter
Convert cooking volume and weight units using ingredient density.
1cr
Cups to Grams Convertercups-to-grams-converter
Convert cups to grams for common cooking ingredients.
1cr
Conversions
Yeast Conversion Calculatoryeast-conversion-calculator
Convert fresh, active dry, and instant yeast amounts.
1cr
Fermentation
Brine and Salinity Calculatorbrine-and-salinity-calculator
Calculate salt, water, or salinity for brines and fermentation recipes.
1cr
Ratios
Baker's Percentage Calculatorbaker-s-percentage-calculator
Scale bread ingredients from flour weight and baker's percentages.
1cr

Craft 1 endpoint full page →

Cross-Stitch Size Calculatorcross-stitch-size-calculator
Calculate finished cross-stitch design and fabric sizes from stitch and fabric counts.
1cr

Creator 1 endpoint full page →

YouTube Earnings Estimatoryoutube-earnings-estimator
Estimate YouTube ad revenue from views, CPM range, monetized percentage, and revenue share.
1cr

Datetime 2 endpoints full page →

Seasons
Autumnal Equinox Dayautumnal-equinox-day
Return autumn equinox date, UTC time, seasonal markers, and optional countdown data.
1cr
Time
Decimal to Time Converterdecimal-to-time-converter
Convert decimal hours to hours, minutes, and seconds.
1cr

Dev 5 endpoints full page →

Color
CMYK to Hex Convertercmyk-to-hex-converter
Convert CMYK percentages to RGB, HEX, HSL, HSV, and contrast text color.
1cr
Hex to CMYK Converterhex-to-cmyk-converter
Convert a hex color to CMYK print percentages.
1cr
Hex to RGB Converterhex-to-rgb-converter
Convert a hex color to RGB, HSL, CMYK, and contrast metrics.
1cr
RGB to Hex Converterrgb-to-hex-converter
Convert RGB channels to hex, HSL, HSV, CMYK, and relative luminance.
1cr
Encoding
Base64 Decoderbase64-decoder
Decode standard or URL-safe Base64 text and return byte and character analysis.
1cr

Developer 6 endpoints full page →

Data Conversion
XML to JSON Converterxml-to-json-converter
Convert XML into JSON using standard, compact, JsonML, or preserve styles.
1cr
Data Formatting
YAML Formatter/Validatoryaml-formatter-validator
Validate, format, minify, or convert YAML to JSON.
1cr
Data Validation
XML Validatorxml-validator
Validate XML well-formedness and return document statistics.
1cr
Encoders
Text to Binary/Hex/ASCII Convertertext-to-binary-hex-ascii-converter
Encode or decode text, binary, hex, and ASCII byte values.
1cr
General Tools
Unix Permission Calculatorunix-permission-calculator
Convert Unix permission digits into symbolic permissions and chmod notation.
1cr
Text Conversion
Text to SQL List Convertertext-to-sql-list-converter
Convert lines of text into quoted SQL IN-list or tuple syntax.
1cr

Electronics 4 endpoints full page →

Circuits
Transformer Calculatortransformer-calculator
Calculate transformer turns ratio, secondary voltage, current, power, and impedance ratio.
1cr
Voltage Divider Calculatorvoltage-divider-calculator
Calculate voltage divider output or solve for R1 or R2.
1cr
Runtime
Battery Life Calculatorbattery-life-calculator
Estimate battery runtime from capacity, consumption, and efficiency.
1cr
Wiring
Voltage Drop Calculatorvoltage-drop-calculator
Calculate electrical voltage drop for AWG copper or aluminum wire runs.
1cr

Engineering 1 endpoint full page →

Wire Gauge Calculatorwire-gauge-calculator
Calculate AWG diameter, area, resistance, ampacity, and optional voltage drop.
1cr

Environment 1 endpoint full page →

Water Usage Calculatorwater-usage-calculator
Estimate household daily, monthly, and annual water use by activity.
1cr

Event 1 endpoint full page →

Wedding Alcohol Calculatorwedding-alcohol-calculator
Estimate wine, beer, spirits, and champagne quantities for an event.
1cr

Lifestyle 6 endpoints full page →

Crafts
Yarn Calculatoryarn-calculator
Estimate yarn yards, meters, grams, and skeins for common knitting/crochet projects.
1cr
Fitness
Bench Press Calculatorbench-press-calculator
Estimate bench press one-rep max, formula comparisons, and training zones.
1cr
BMR Calculatorbmr-calculator
Calculate BMR, RMR estimate, TDEE, macro estimates, and activity-level calorie needs.
1cr
Health
BAC Calculatorbac-calculator
Estimate blood alcohol content using standard-drink counts and the Widmark formula.
1cr
Biological Age Calculatorbiological-age-calculator
Estimate biological age from lifestyle and health-factor adjustments.
1cr
Numerology
Angel Number Calculatorangel-number-calculator
Find recurring angel-number interpretations or derive one from a birth date.
1cr

Marketing 1 endpoint full page →

CTR Calculatorctr-calculator
Calculate click-through rate, required clicks for a target CTR, or bulk campaign CTR.
1cr

Miscellaneous 4 endpoints full page →

General Tools
Tire Size Calculatortire-size-calculator
Calculate tire sidewall, diameter, circumference, and revolutions per mile.
1cr
Student Calculators
Test Score Calculatortest-score-calculator
Convert earned and total test points into a percentage, letter grade, and GPA points.
1cr
Weighted Grade Calculatorweighted-grade-calculator
Calculate a weighted course grade from category weights and scores.
1cr
Time
Daily Time Savings Calculatordaily-time-savings-calculator
Calculate yearly, monthly, and weekly time saved from a small daily savings habit.
1cr

Physics 1 endpoint full page →

Boiling Point Calculatorboiling-point-calculator
Calculate water boiling point from altitude or atmospheric pressure.
1cr

Science 32 endpoints full page →

Astronomy
Astronomical Unit Converterastronomical-unit-converter
Convert astronomical distances among AU, light-time, parsecs, kilometers, and miles.
1cr
Chemistry
Percent Yield Calculatorpercent-yield-calculator
Solve percent yield, actual yield, or theoretical yield.
1cr
Electronics
555 Timer Calculator555-timer-calculator
Calculate 555 timer astable frequency, period, duty cycle, or monostable pulse width.
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Capacitor Calculatorcapacitor-calculator
Calculate capacitor charge, stored energy, reactance, RC timing, or decode ceramic capacitor codes.
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Decibel (dB) Calculatordecibel-db-calculator
Calculate power dB, voltage dB, dB ratios, and dBm/dBW/watt conversions.
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Ohm's Law Calculatorohm-s-law-calculator
Calculate voltage, current, resistance, and power from any two known values.
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Resonant Frequency Calculatorresonant-frequency-calculator
Calculate LC/RLC resonant frequency, inductance, capacitance, impedance, Q factor, and bandwidth.
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Physics
Density Calculatordensity-calculator
Solve density, mass, or volume with common unit conversions.
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Force Calculatorforce-calculator
Solve Newton's second law for force, mass, or acceleration with common unit conversions.
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Kinetic Energy Calculatorkinetic-energy-calculator
Solve kinetic energy, mass, or velocity with KE = 1/2 m v^2 and unit conversions.
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Momentum Calculatormomentum-calculator
Calculate linear momentum and kinetic energy from mass and velocity.
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Potential Energy Calculatorpotential-energy-calculator
Calculate gravitational or elastic potential energy and solve for missing variables.
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Torque Calculatortorque-calculator
Solve torque, force, lever arm distance, or angle using tau = F r sin(theta).
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Velocity Calculatorvelocity-calculator
Calculate average velocity, distance, time, or relative velocity with distance, time, and speed units.
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Work and Power Calculatorwork-and-power-calculator
Calculate mechanical work and power with common unit conversions.
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Physics Calculators
Electricity Calculatorelectricity-calculator
Solve voltage, current, resistance, and power from any two known Ohm's law values.
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Pressure
Bar to PSI Converterbar-to-psi-converter
Convert bar and PSI, including kPa, MPa, atm, torr, inHg, and Pa.
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psi to kPa Converterpsi-to-kpa-converter
Convert pounds per square inch to kilopascals and related pressure units.
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Temperature
Celsius to Fahrenheit Calculatorcelsius-to-fahrenheit-calculator
Convert Celsius to Fahrenheit and related temperature scales.
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Celsius to Kelvin Convertercelsius-to-kelvin-converter
Convert Celsius to Kelvin and related temperature scales.
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Celsius to Rankine Convertercelsius-to-rankine-converter
Convert Celsius to Rankine and related temperature scales.
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Fahrenheit to Celsius Calculatorfahrenheit-to-celsius-calculator
Convert Fahrenheit to Celsius and related temperature scales.
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Fahrenheit to Kelvin Converterfahrenheit-to-kelvin-converter
Convert Fahrenheit to Kelvin and related temperature scales.
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Fahrenheit to Rankine Converterfahrenheit-to-rankine-converter
Convert Fahrenheit to Rankine and related temperature scales.
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Kelvin to Celsius Converterkelvin-to-celsius-converter
Convert Kelvin to Celsius and related temperature scales.
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Kelvin to Fahrenheit Converterkelvin-to-fahrenheit-converter
Convert Kelvin to Fahrenheit and related temperature scales.
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Rankine to Celsius Converterrankine-to-celsius-converter
Convert Rankine to Celsius and related temperature scales.
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Rankine to Fahrenheit Converterrankine-to-fahrenheit-converter
Convert Rankine to Fahrenheit and related temperature scales.
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Unit Converters
Energy Converterenergy-converter
Convert energy between joules, calories, BTU, watt-hours, electronvolts, ergs, and therms.
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Power Converterpower-converter
Convert power among watts, kilowatts, horsepower, BTU per hour, refrigeration tons, and related units.
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Ultimate Frequency & Wavelength Converterultimate-frequency-wavelength-converter
Convert between frequency and wavelength using a configurable propagation speed and identify the spectrum band.
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Weather
Wind Chill Calculatorwind-chill-calculator
Calculate NWS wind chill and frostbite risk from air temperature and wind speed.
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Sports 13 endpoints full page →

Baseball
At Bats per Home Run Calculatorat-bats-per-home-run-calculator
Calculate baseball at-bats per home run ratio and home run rate.
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Batting Average Calculatorbatting-average-calculator
Calculate baseball batting average from hits and at-bats.
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ERA Calculatorera-calculator
Calculate baseball earned run average.
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FIP Calculatorfip-calculator
Calculate baseball fielding independent pitching.
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OPS Calculatorops-calculator
Calculate baseball on-base plus slugging with OBP and SLG components.
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Slugging Percentage Calculatorslugging-percentage-calculator
Calculate baseball slugging percentage from hit types.
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Total Bases Calculatortotal-bases-calculator
Calculate baseball total bases from singles, doubles, triples, and home runs.
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WAR Calculatorwar-calculator
Estimate simplified baseball WAR for position players or pitchers.
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WHIP Calculatorwhip-calculator
Calculate baseball WHIP with baseball innings notation support.
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Basketball
Effective Field Goal Percentage Calculatorefg-calculator
Calculate basketball effective field goal percentage.
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Field Goal Percentage Calculatorfield-goal-percentage-calculator
Calculate made-shot percentage and related shooting metrics.
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Rebound Rate Calculatorrebound-rate-calculator
Calculate basketball offensive, defensive, and total rebound rates.
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True Shooting Percentage Calculatortrue-shooting-percentage-calculator
Calculate basketball true shooting percentage from points, FGA, and FTA.
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Time-Date 9 endpoints full page →

Calendar
When Is Leap Yearwhen-is-leap-year
Check leap-year status and nearby leap years using Gregorian rules.
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Date Tools
Date Calculatordate-calculator
Add or subtract years, months, weeks, and days from a date.
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Date Difference Calculatordate-difference-calculator
Calculate days, weeks, approximate months/years, and business days between two dates.
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Time Between Two Datestime-between-two-dates
Calculate exact elapsed time between two ISO datetimes.
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Season
Winter Solstice Daywinter-solstice-day
Return winter solstice date/time for Northern or Southern Hemisphere, 2024-2030.
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Time Calculators
Time Duration Calculatortime-duration-calculator
Calculate elapsed time between two times or datetimes.
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Time to Decimal Convertertime-to-decimal-converter
Convert between hours/minutes/seconds and decimal hours.
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Work Hours Calculatorwork-hours-calculator
Calculate weekly work hours, overtime, and optional pay from day entries.
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Time Conversion
Unix Time Converterunix-time-converter
Convert between Unix timestamps and UTC ISO datetimes.
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