For the complete documentation index, see llms.txt.
800 endpoints · 37 categories

Catalog

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

› /
Finance 139 Text 47 Hash & Checksum 14 Math 355 Random 12 Webmaster 10 Business 4 Color 3 Construction 10 Conversion 4 Converters 1 Cooking 12 Craft 5 Creator 1 Datetime 2 Dev 11 Developer 6 Education 6 Electronics 7 Engineering 3 Environment 1 Event 1 Fitness 3 Food 2 Gaming 1 Health 8 Home 4 Lifestyle 14 Marketing 11 Miscellaneous 4 Network 3 Physics 2 Productivity 1 Science 64 Sports 15 Time 5 Time-Date 9

Finance 139 endpoints full page →

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

Accounting
Depreciation Calculatordepreciation-calculator
Generate straight-line or declining-balance depreciation schedules with chart-ready book values.
1cr
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
Bills
Tip Calculatortip-calculator
Calculate tip, tax, total bill, split amounts, and chart-ready bill breakdown.
1cr
Bonds
Bond Equivalent Yield Calculatorbond-equivalent-yield-calculator
Calculate bond equivalent yield for a discount security.
2cr
Bond Yield to Maturity Calculatorbond-yield-to-maturity-calculator
Calculate bond yield to maturity with current yield and return metrics.
2cr
Zero Coupon Bond Calculatorzero-coupon-bond-calculator
Calculate zero coupon bond price or yield to maturity.
2cr
Cash Flow
Cash Flow Calculatorcash-flow-calculator
Calculate net cash flow, ending cash, and optional month-by-month cash balance.
1cr
Coverage
Debt Service Coverage Ratio Calculatordebt-service-coverage-ratio-calculator
Calculate DSCR and cash flow after annual debt service.
1cr
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 Consolidation Calculatordebt-consolidation-calculator
Estimate a consolidated debt payment and interest cost.
2cr
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
Sale Price Calculatorsale-price-calculator
Calculate discounted sale price, tax, final price, and chart-ready price breakdown.
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
Inventory Turnover Ratio Calculatorinventory-turnover-ratio-calculator
Calculate inventory turnover ratio and days inventory outstanding.
1cr
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
Everyday Calculators
Pizza Value Calculatorpizza-value-calculator
Compare two pizzas by area, price per area, slice value, and savings percentage.
1cr
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
Housing
Rent Affordability Calculatorrent-affordability-calculator
Estimate affordable monthly rent from income, debt, utilities, and rent budget percent.
1cr
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
Rule of 72 Calculatorrule-of-72-calculator
Estimate investment doubling time with the Rule of 72 and exact compound formula.
1cr
Simple Interest Calculatorsimple-interest-calculator
Simple-interest formula: I = P * r * t.
2cr
Investing
CAPM Calculatorcapm-calculator
Solve the Capital Asset Pricing Model for expected return, risk-free rate, market return, or beta.
2cr
Dollar Cost Averaging Calculatordollar-cost-averaging-calculator
Simulate portfolio growth from regular periodic investments with compounding returns.
2cr
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
Options
Black-Scholes Calculatorblack-scholes-calculator
Price European call and put options with dividend-adjusted Black-Scholes and full Greeks.
2cr
Payroll
Time Card Calculatortime-card-calculator
Calculate regular hours, overtime hours, gross pay, and daily hour chart data.
1cr
Planning
Budget Calculatorbudget-calculator
Allocate income into needs, wants, and savings using the 50/30/20 budgeting rule.
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
Break Even Point Calculatorbreak-even-point-calculator
Calculate break-even units, revenue, costs, and rounded-unit profit.
1cr
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
Margin Calculatormargin-calculator
Calculate gross profit, margin percent, markup percent, and chart-ready revenue breakdown.
1cr
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
Operating Profit Percentage Calculatoroperating-profit-percentage-calculator
Calculate operating profit percentage from operating income or a revenue cost breakdown.
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
Cap Rate Calculatorcap-rate-calculator
Calculate net operating income, cap rate, expense ratio, and monthly NOI.
1cr
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
Loan to Cost Calculatorloan-to-cost-calculator
Calculate loan-to-cost percent and equity required for a project.
1cr
Loan to Value Calculatorloan-to-value-calculator
Calculate loan-to-value percent, equity, and equity percent for a property.
1cr
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
Retirement
Retirement Calculatorretirement-calculator
Estimate retirement savings growth, inflation-adjusted value, and contribution breakdown.
1cr
Roth IRA Calculatorroth-ira-calculator
Project Roth IRA growth with contributions, earnings, and chart-ready year-by-year data.
1cr
Return
CAGR Calculatorcagr-calculator
Calculate the compound annual growth rate between a beginning and ending value.
2cr
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
Recurring Deposit Calculatorrecurring-deposit-calculator
Project recurring monthly deposits with compound interest and chart-ready balance data.
1cr
Savings Calculatorsavings-calculator
Project savings growth with recurring contributions and chart-ready balance data.
1cr
Startup
Burn Rate Calculatorburn-rate-calculator
Calculate gross burn, net burn, and estimated runway from cash flow.
1cr
Runway Calculatorrunway-calculator
Calculate cash runway in months and chart the cash balance decline.
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 Annuity Due Calculatorpresent-value-annuity-due-calculator
Calculate the present value of an annuity due and compare it with an ordinary 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
PVIF Calculatorpvif-calculator
Calculate the present value interest factor and discounted future value.
2cr
PVIFA Calculatorpvifa-calculator
Calculate the present value interest factor of an annuity and optional present value.
2cr
Tax
VAT Calculatorvat-calculator
Add, remove, or extract VAT from an amount using a preset or custom rate.
2cr
Taxes
Tax Calculatortax-calculator
Estimate taxable income, tax, take-home income, and effective rate from user-supplied flat rates.
1cr
Time Value
Present Value Calculatorpresent-value-calculator
Discount a future value to present value with configurable compounding and chart-ready series.
1cr
Travel
Fuel Cost Calculatorfuel-cost-calculator
Estimate trip fuel usage, total fuel cost, and per-person cost.
1cr
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
Vehicle Costs
Cost Per Mile Calculatorcost-per-mile-calculator
Estimate total annual driving cost and the true cost per mile from fuel and ownership costs.
1cr

Text 47 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
Lipogram Checkerlipogram-checker
Check whether text avoids one or more forbidden letters.
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
Cipher
Caesar Cipher Toolcaesar-cipher-tool
Encrypt or decrypt text with a Caesar shift cipher, with optional brute-force candidates.
1cr
Cleanup
List Cleanerlist-cleaner
Trim, deduplicate, remove blanks, and optionally sort list lines.
1cr
Smart Quotes Removersmart-quotes-remover
Replace curly smart quotes and primes with straight quotes, with JSON-safe escaping.
1cr
Comparison
Diff Checkerdiff-checker
Compare two texts line by line and return change statistics with a unified diff.
1cr
Conversion
Number to Word Converternumber-to-word-converter
Convert a decimal number to English cardinal, ordinal, or currency words.
1cr
Deduplication
Remove Duplicate Linesremove-duplicate-lines
Remove duplicate text lines while keeping first, last, or only unique occurrences.
1cr
Encoding
Morse Code Decodermorse-code-decoder
Decode International Morse Code to text (single space between letters, three spaces between words).
1cr
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
Generators
Buzzword Bingo Generatorbuzzword-bingo-generator
Generate a deterministic buzzword bingo board from a term list and seed.
1cr
Lines
Reverse Linereverse-line
Reverse the characters in each line of 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
Break Line by Charactersbreak-line-by-characters
Insert line breaks at a maximum character count, with smart word-wrap or hard-break modes.
1cr
Find and Replace Textfind-replace-text
Find and replace text with literal or regex patterns, case and whole-word options.
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 Linesreverse-lines
Reverse the order of lines in a text block.
1cr
Reverse Textreverse-text
Reverse whole text, word order, each word, or line order.
1cr
String Repeatstring-repeat
Repeat a string with separators, optional prefixes, suffixes, and numbering.
1cr
Sorting
Sort Lines Alphabeticallysort-lines-alphabetically
Sort text lines alphabetically, naturally, numerically, or by length.
1cr
Sort Text By Lengthsort-text-by-length
Sort text lines by character length with basic line statistics.
1cr
Subtitles
CSV to SRT Convertercsv-to-srt
Convert CSV subtitle rows with start, end, and text columns to SRT.
1cr
SRT to CSV Convertersrt-to-csv
Convert SRT subtitle content to CSV rows.
1cr
SRT to TXT Convertersrt-to-txt
Extract plain, timestamped, JSON, or sentence text from SRT subtitles.
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
Word Games
Anagram Generatoranagram-generator
Generate letter-permutation anagrams of a word and check whether two words are anagrams.
1cr

Hash & Checksum 14 endpoints full page →

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

Checksum
Adler-32 Checksum Calculatoradler32-checksum-calculator
Calculate the Adler-32 checksum of UTF-8 text with A and B component breakdown.
1cr
CRC32 Checksum Calculatorcrc32-checksum-calculator
Calculate the IEEE CRC32 checksum of text in hex, decimal, and binary form.
1cr
CRC64 Checksum Calculatorcrc64-checksum-calculator
Calculate the CRC64 checksum of text using ECMA-182, WE, or Jones polynomial variants.
1cr
FNV-1a Hash Generatorfnv1a-hash-generator
Generate a fast non-cryptographic FNV-1a hash in 32, 64, 128, or 256-bit variants.
1cr
Digest
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
SHA1 Hash Generatorsha1-hash-generator
Generate the SHA-1 hash (160-bit) of text.
1cr
SHA-224 Hash Generatorsha224-hash-generator
Generate the SHA-224 hash (224-bit) of text.
1cr
SHA-256 Hash Generatorsha256-hash-generator
Generate a SHA-256 hex digest of a UTF-8 string.
1cr
SHA3-256 Hash Generatorsha3-256-hash-generator
Generate the SHA3-256 hash (256-bit Keccak) of text.
1cr
SHA3-384 Hash Generatorsha3-384-hash-generator
Generate the SHA3-384 hash (384-bit Keccak) of text.
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 355 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
Error Function Calculatorerror-function-calculator
Evaluate erf, erfc, inverse erf, and inverse erfc for bounded inputs.
1cr
Gamma Function Calculatorgamma-function-calculator
Evaluate the gamma function for bounded real inputs.
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
Binomial Theorem Expansion Calculatorbinomial-theorem-expansion-calculator
Expand (a + b)^n for n up to 50 with every coefficient and term listed.
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
Linear Equation Solverlinear-equation-solver
Solve a linear equation in the form ax + b = c.
1cr
Parabola Calculatorparabola-calculator
Analyze a quadratic parabola from coefficients a, b, and c.
1cr
Partial Fraction Decomposition Calculatorpartial-fraction-decomposition-calculator
Decompose a rational expression into partial fractions.
1cr
Point Slope Form Calculatorpoint-slope-form-calculator
Build point-slope, slope-intercept, and standard-form line equations.
1cr
Quadratic Formula Calculatorquadratic-formula-calculator
Solve quadratic roots with discriminant and vertex details.
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
Standard Form to Slope Intercept Converterstandard-form-to-slope-intercept-converter
Convert Ax + By = C into slope-intercept form when possible.
1cr
Synthetic Division Calculatorsynthetic-division-calculator
Divide polynomial coefficients by x minus a using synthetic division.
1cr
X and Y Intercept Calculatorx-y-intercept-calculator
Find x- and y-intercepts for a linear equation ax + by + c = 0.
1cr
Algebra Calculators
Vertex and Axis of Symmetry Calculatorvertex-axis-calculator
Find the vertex and axis of symmetry for a quadratic ax^2 + bx + c.
1cr
Analytic Geometry
Parallel and Perpendicular Line Calculatorparallel-and-perpendicular-line-calculator
Find parallel and perpendicular lines through a given point.
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
Arithmetic
Long Addition and Subtraction Calculatorlong-addition-and-subtraction-calculator
Add or subtract large integers and return aligned column output.
1cr
Order of Operations Calculator PEMDASorder-of-operations-calculator-pemdas
Evaluate arithmetic expressions using standard PEMDAS precedence.
1cr
Audio
BPM to Millisecond Delay Calculatorbpm-to-ms-delay-calculator
Convert tempo in BPM into synchronized straight, dotted, and triplet delay times.
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
Long Division Calculatorlong-division-calculator
Calculate quotient, remainder, decimal expansion, and long division steps.
1cr
Long Multiplication Calculatorlong-multiplication-calculator
Calculate a product with long multiplication partial products.
1cr
Nth Root Calculatornth-root-calculator
High-precision nth roots (up to 100 decimals) with exact-root detection and verification.
1cr
Number of Digitsnumber-of-digits
Count the digits of any integer with digit frequency, palindrome check, and scientific notation.
1cr
Quotient and Remainder Calculatorquotient-and-remainder-calculator
Compute the integer quotient and remainder of a division with verification.
1cr
Sum Calculatorsum-calculator
High-precision decimal sum of up to 5000 numbers with average, median, and sign statistics.
1cr
Calculus
Average Rate of Change Calculatoraverage-rate-of-change-calculator
Compute the average rate of change of f(x) on [a, b] with the secant line equation.
1cr
Curvature Calculatorcurvature-calculator
Calculate curvature and radius of curvature for a quadratic function.
1cr
Partial Derivative Calculatorpartial-derivative-calculator
Differentiate a symbolic expression with respect to x, y, z, or t.
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
Derangement (Subfactorial) Calculatorderangement-subfactorial-calculator
Calculate the number of derangements (subfactorial !n) for n elements.
1cr
Permutation Calculatorpermutation-calculator
Calculate P(n,r), where order matters and repetition is not allowed.
1cr
Permutations with Repetition Calculatorpermutations-with-repetition-calculator
Calculate n^r ordered arrangements where items can repeat.
1cr
Stirling Numbers Calculatorstirling-numbers-calculator
Calculate unsigned Stirling numbers of the first kind and Stirling numbers of the second kind.
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
Paver Calculatorpaver-calculator
Estimate paving stones needed for a rectangular project area.
1cr
Cooking
Butter to Oil Converterbutter-to-oil-converter
Convert butter quantities to practical oil equivalents for baking.
1cr
Coordinate Geometry
Polar to Cartesian Converterpolar-to-cartesian-converter
Convert polar coordinates to Cartesian x and y coordinates.
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
PCB Trace Width Calculatorpcb-trace-width-calculator
Estimate PCB trace width using the IPC-2221 current capacity formula.
1cr
Exponents
Exponents Calculatorexponents-calculator
Raise a base to any power: exact decimal arithmetic for integer exponents up to ±500.
1cr
Half Life Calculatorhalf-life-calculator
Solve exponential decay for remaining amount, initial amount, elapsed time, or half-life.
1cr
Finance
Payback Period Calculatorpayback-period-calculator
Calculate the payback period from an initial investment and annual cash flows.
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 Calculatorfraction-calculator
Add, subtract, multiply, divide, compare, or simplify fractions.
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
Multiple Fraction Calculatormultiple-fraction-calculator
Apply one arithmetic operation across a list of fractions.
1cr
Number to Fraction Converternumber-to-fraction-converter
Convert decimals, percentages, mixed numbers, and repeating decimals to fractions.
1cr
Reduce Fractions Calculatorreduce-fractions-calculator
Reduce a proper, improper, or mixed fraction to lowest terms.
1cr
Functions
Ceiling and Floor Function Calculatorceiling-and-floor-function-calculator
Evaluate floor, ceiling, fractional part, and nearest integer of a value.
1cr
Function Composition Calculatorfunction-composition-calculator
Evaluate f(x), g(x), f(g(x)), and g(f(x)) for arithmetic functions.
1cr
Function Odd Even Neither Checkerfunction-odd-even-neither-checker
Classify a function as odd, even, both, or neither over sample points.
1cr
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
Cylinder Calculatorcylinder-calculator
Calculate cylinder volume, base area, lateral area, and total surface area.
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
Point to Plane Distance Calculatorpoint-to-plane-distance-calculator
Calculate the distance from a 3D point to a plane Ax + By + Cz + D = 0.
1cr
Polygon Diagonals Calculatorpolygon-diagonals-calculator
Calculate the number of diagonals and angle facts for a polygon.
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
Right Triangle Calculatorright-triangle-calculator
Solve a right triangle from two sides or one side and one acute angle.
1cr
Shoelace Formula Calculatorshoelace-formula-calculator
Calculate polygon area from vertex coordinates using the shoelace formula.
1cr
Slope Calculatorslope-calculator
Calculate slope, angle, intercepts, and line equation from two points.
1cr
Sphere Calculatorsphere-calculator
Calculate sphere radius, diameter, circumference, surface area, and volume.
1cr
Square Calculatorsquare-calculator
Calculate square side length, area, perimeter, diagonal, inradius, and circumradius from one known value.
1cr
Triangle Area Calculatortriangle-area-calculator
Calculate triangle area from base and height or Heron's formula.
1cr
Triangle Centroid Calculatortriangle-centroid-calculator
Calculate a triangle centroid and related side, area, and median properties.
1cr
Geometry Calculators
Surface Area of a Rectangular Prism Calculatorsurface-area-of-a-rectangular-prism-calculator
Calculate rectangular prism surface area, lateral area, volume, diagonal, and face areas.
1cr
Tangent Line to Circle Calculatortangent-line-to-circle-calculator
Find tangent line equations and contact points from a point to a circle.
1cr
Torus Calculatortorus-calculator
Calculate torus volume, surface area, and key radii.
1cr
Triangle Orthocenter Calculatortriangle-orthocenter-calculator
Calculate a triangle orthocenter, altitude feet, side lengths, area, and classifications from coordinates.
1cr
Graph Theory
Dijkstra's Shortest Path Calculatordijkstra-s-shortest-path-calculator
Run Dijkstra's algorithm on a small weighted graph.
1cr
Graph Degree Sequence Validatorgraph-degree-sequence-validator
Validate simple graph degree sequences with the Havel-Hakimi algorithm.
1cr
Growth
Logarithmic Growth Calculatorlogarithmic-growth-calculator
Solve compound growth value, time-to-target, or rate using logarithms.
1cr
Home
Aquarium Substrate Calculatoraquarium-substrate-calculator
Estimate aquarium substrate volume, weight, and bag counts.
1cr
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.
1cr
Length Converters
Inches to Millimeters Converterinches-to-mm-converter
Convert decimal, fractional, or mixed-number inches to millimeters.
1cr
Lifestyle
Christmas Tree Calculatorchristmas-tree-calculator
Check tree height fit and estimate lights, ornaments, and garland.
1cr
Linear Algebra
Angle Between Vectors Calculatorangle-between-vectors-calculator
Calculate the angle between two 2D or 3D vectors.
1cr
Characteristic Polynomial Calculatorcharacteristic-polynomial-calculator
Calculate characteristic polynomial coefficients for a square matrix.
1cr
Cholesky Decomposition Calculatorcholesky-decomposition-calculator
Decompose a symmetric positive-definite matrix into A = L L^T.
1cr
Column Space Calculatorcolumn-space-calculator
Find matrix pivot columns, rank, nullity, RREF, and a column-space basis.
1cr
Cramer's Rule Calculatorcramer-s-rule-calculator
Solve 2x2 or 3x3 linear systems with Cramer's rule.
1cr
Cross Product Calculatorcross-product-calculator
Calculate the 3D cross product, magnitude, areas, and angle.
1cr
Determinant Calculatordeterminant-calculator
Calculate the determinant, trace, rank, and invertibility of a square matrix.
1cr
Dot Product Calculatordot-product-calculator
Calculate the dot product, magnitudes, angle, and vector projection.
1cr
Matrix Trace Calculatormatrix-trace-calculator
Calculate the trace and diagonal details of a square matrix.
1cr
Unit Vector Calculatorunit-vector-calculator
Normalize a vector and return its unit vector.
1cr
Vector Magnitude Calculatorvector-magnitude-calculator
Calculate the Euclidean magnitude and unit vector for any vector.
1cr
Vector Projection Calculatorvector-projection-calculator
Project one vector onto another and compute the orthogonal component.
1cr
Logarithms
Log Base 10 Calculatorlog-base-10-calculator
Calculate common logarithms with bounds and an antilog check.
1cr
Log Base 2 Calculatorlog-base-2-calculator
Calculate binary logarithms and detect exact powers of two.
1cr
Log Calculatorlog-calculator
Logarithm of x in base 10, e, 2, or any custom base, with all three standard logs for comparison.
1cr
Natural Log Calculatornatural-log-calculator
ln(x) with log10, log2, the derivative 1/x, and e^x, flagging exact powers of e.
1cr
Logic
Truth Table Generatortruth-table-generator
Generate truth tables for small boolean logic expressions.
1cr
Number Formatting
Rounding Calculatorrounding-calculator
Round to decimal places, significant figures, or the nearest multiple with 6 rounding methods compared.
1cr
Significant Figures Calculatorsignificant-figures-calculator
Count, round, and apply arithmetic rules for significant figures.
1cr
Number Systems
Base Converterbase-converter
Convert integers between bases 2 through 36.
1cr
Base-N Calculatorbase-n-calculator
Convert an integer from any base 2 through 36 to every other base.
1cr
BCD to Binary Converterbcd-to-binary-converter
Convert 8421 BCD nibbles to decimal and binary.
1cr
BCD to Decimal Converterbcd-to-decimal-converter
Convert binary-coded decimal nibbles to a decimal integer.
1cr
BCD to Hex Converterbcd-to-hex-converter
Convert BCD to hexadecimal or hexadecimal to BCD.
1cr
Binary Calculatorbinary-calculator
Run binary arithmetic and bitwise operations.
1cr
Binary Converterbinary-converter
Convert a binary number to decimal, hexadecimal, octal, or any base from 2 to 36.
1cr
Binary to BCD Converterbinary-to-bcd-converter
Convert an integer binary value to binary-coded decimal.
1cr
Binary to Decimal Converterbinary-to-decimal-converter
Convert a binary number to decimal, hexadecimal, and octal.
1cr
Binary to Gray Code Converterbinary-to-gray-code-converter
Convert an integer binary value to Gray code.
1cr
Binary to Hex Converterbinary-to-hex-converter
Convert a binary number to hexadecimal with nibble grouping.
1cr
Binary to Octal Converterbinary-to-octal-converter
Convert a binary number to octal using 3-bit grouping.
1cr
Decimal to Binary Converterdecimal-to-binary-converter
Convert a decimal integer to binary with grouped bits and division steps.
1cr
Decimal to Hex Converterdecimal-to-hex-converter
Convert a decimal integer to hexadecimal with conversion steps.
1cr
Decimal to Octal Converterdecimal-to-octal-converter
Convert a base-10 integer to octal with division steps.
1cr
Decimal to Scientific Notation Converterdecimal-to-scientific-notation-converter
Convert decimal numbers to scientific, E, and engineering notation.
1cr
Gray Code to Binary Convertergray-code-to-binary-converter
Convert Gray code to ordinary binary with XOR steps.
1cr
Hex Converterhex-converter
Convert integers between hexadecimal, decimal, binary, and octal.
1cr
Hex to BCD Converterhex-to-bcd-converter
Convert a hexadecimal integer to binary-coded decimal.
1cr
Hex to Binary Converterhex-to-binary-converter
Convert a hexadecimal integer to binary.
1cr
Hex to Decimal Converterhex-to-decimal-converter
Convert a hexadecimal integer to decimal with digit breakdown.
1cr
Hex to Octal Converterhex-to-octal-converter
Convert a hexadecimal integer to octal through binary grouping.
1cr
Octal Converteroctal-converter
Convert non-negative integers between octal, decimal, binary, and hex.
1cr
Octal to Binary Converteroctal-to-binary-converter
Convert an octal integer to binary with per-digit mapping.
1cr
Octal to Decimal Converteroctal-to-decimal-converter
Convert an octal integer to decimal with positional breakdown.
1cr
Ratio to Percentage Calculatorratio-to-percentage-calculator
Convert ratios, fractions, or decimal divisions to percentages.
1cr
Roman Numerals Converterroman-numerals-converter
Convert between Roman numerals and Arabic numbers (1-3999) with canonical-form checking.
1cr
Scientific Notation to Decimal Converterscientific-notation-to-decimal-converter
Convert scientific notation to ordinary decimal notation.
1cr
Number Theory
Amicable Number Checkeramicable-number-checker
Check whether two integers form an amicable pair, or find the partner of a single number.
1cr
Chinese Remainder Theorem Calculatorchinese-remainder-theorem-calculator
Solve a system of simultaneous congruences with pairwise coprime moduli using the CRT.
1cr
Continued Fraction Calculatorcontinued-fraction-calculator
Expand a decimal, fraction, or square root into a continued fraction with convergents.
1cr
Divisibility Test Calculatordivisibility-test-calculator
Test a number against common divisors, primes, or custom divisors with rule explanations.
1cr
Euler's Totient Function Calculatoreuler-s-totient-function-calculator
Calculate Euler's totient function phi(n) with its prime factorization.
1cr
Extended Euclidean Algorithm Calculatorextended-euclidean-algorithm-calculator
Find the GCD of two integers and Bezout coefficients via the extended Euclidean algorithm.
1cr
Factor Calculatorfactor-calculator
List all factors and factor pairs of a number up to 10^12 with its prime factorization.
1cr
Factorial Calculatorfactorial-calculator
Calculate factorial metadata, exact values for bounded inputs, and scientific notation.
1cr
Fibonacci Number Checkerfibonacci-number-checker
Check whether a non-negative integer is in the Fibonacci sequence.
1cr
First n Prime Numbersfirst-n-prime-numbers
Generate the first n primes (up to 10,000) with twin-prime pairs and gap statistics.
1cr
Goldbach Conjecture Verifiergoldbach-conjecture-verifier
Verify an even integer by finding prime pairs that sum to it.
1cr
Greatest Common Factor Calculatorgreatest-common-factor-calculator
Find the GCF of up to 15 numbers with prime factorizations and all common factors.
1cr
Prime Number Checkeris-it-a-prime-number
Check whether a number up to 10^15 is prime, with factorization and the 5 nearest primes either side.
1cr
Least Common Multiple Calculatorleast-common-multiple-calculator
Find the LCM of up to 15 numbers with prime factorizations and the GCF cross-check.
1cr
List of Prime Numberslist-of-prime-numbers
List every prime from 2 up to a limit (max 10,000) with density and twin-prime statistics.
1cr
Mersenne Prime Checkermersenne-prime-checker
Check whether 2^p - 1 is prime for bounded exponents.
1cr
Möbius Function Calculatormobius-function-calculator
Evaluate the Möbius function μ(n) from the prime factorization of n.
1cr
Modular Exponentiation Calculatormodular-exponentiation-calculator
Compute base^exponent mod modulus efficiently with binary square-and-multiply statistics.
1cr
Partition Function Calculatorpartition-function-calculator
Calculate the integer partition number p(n) for bounded n.
1cr
Perfect Number Checkerperfect-number-checker
Classify a positive integer as perfect, abundant, or deficient.
1cr
Prime Factor Calculatorprime-factor-calculator
Prime factors plus divisor sum, Euler's totient, and abundant/deficient/perfect classification.
1cr
Prime Factorization Calculatorprime-factorization-calculator
Factor a number up to 10^15 into primes with exponent form and divisor count.
1cr
Primitive Root Calculatorprimitive-root-calculator
Test whether primitive roots exist modulo n and list them with φ(n).
1cr
Twin Prime Findertwin-prime-finder
Find twin prime pairs up to a bounded integer limit.
1cr
Numerology
Destiny Number Calculatordestiny-number-calculator
Calculate a Pythagorean numerology destiny number from a name.
1cr
Payroll
Overtime Pay Calculatorovertime-pay-calculator
Calculate regular pay, overtime pay, gross pay, and effective hourly rate.
1cr
Percentage
Decimal to Percent Converterdecimal-to-percent-converter
Convert one or more decimal numbers to percentages.
1cr
Percent to Decimal Converterpercent-to-decimal-converter
Convert one or many percentages to decimals (divide by 100), batch input supported.
1cr
Percentage Calculatorpercentage-calculator
Six percentage operations behind one endpoint, selected by mode.
1cr
Percentage Change Calculatorpercentage-change-calculator
Calculate percentage change between two values with chart-ready before-and-after data.
1cr
Percentage Decrease Calculatorpercentage-decrease-calculator
Find a percentage decrease, apply one to a value, or recover the original value before a decrease.
1cr
Percentage Error Calculatorpercentage-error-calculator
Calculate percent error between estimated and actual values.
1cr
Percentages
Percent Growth Rate Calculatorpercent-growth-rate-calculator
Calculate total percent change, simple annual growth, CAGR, and multiplier.
1cr
Physics
Acceleration Calculatoracceleration-calculator
Calculate acceleration from velocity change, distance, force, centripetal motion, or free fall.
1cr
Boxing Punch Power Calculatorboxing-punch-power-calculator
Estimate punch force, kinetic energy, and power from speed and effective mass.
1cr
Headlight Beam Distance Calculatorheadlight-beam-distance-calculator
Calculate headlight beam road reach from mounting height and aim angle.
1cr
Horsepower Calculatorhorsepower-calculator
Solve horsepower, torque, or RPM and return common power conversions.
1cr
Penny Drop Impact Calculatorpenny-drop-impact-calculator
Estimate idealized penny impact velocity, energy, momentum, and force.
1cr
Speed Calculatorspeed-calculator
Calculate speed from distance and time with common speed unit conversions.
1cr
Planning
Parking Ratio Calculatorparking-ratio-calculator
Estimate parking spaces from common land-use parking ratios.
1cr
Probability
Bayes' Theorem Calculatorbayes-theorem-calculator
Calculate the posterior probability with Bayes' theorem, likelihood ratio, and natural frequencies.
1cr
Binomial Probability Distribution Calculatorbinomial-probability-distribution-calculator
Calculate exact and cumulative binomial probabilities.
1cr
Dice Roll Probability Calculatordice-roll-probability-calculator
Calculate exact probability metrics for sums of identical dice.
1cr
Gacha Pity Calculatorgacha-pity-calculator
Estimate pull success probability with soft and hard pity rates.
1cr
Geometric Distribution Calculatorgeometric-distribution-calculator
Compute PMF, CDF, survival, mean, and variance for a geometric distribution.
1cr
Hypergeometric Distribution Calculatorhypergeometric-distribution-calculator
Calculate exact and cumulative hypergeometric probabilities.
1cr
Loot Drop Probability Calculatorloot-drop-probability-calculator
Calculate loot drop odds across repeated independent attempts.
1cr
Poisson Distribution Calculatorpoisson-distribution-calculator
Calculate Poisson PMF, CDF, and tail probabilities.
1cr
Probability Calculatorprobability-calculator
Compute basic, conditional, Bayes, and complement probabilities.
1cr
Ratios
Aspect Ratio Calculatoraspect-ratio-calculator
Simplify dimensions to a ratio, derive dimensions from a ratio, or resize proportionally.
1cr
Proportion Calculatorproportion-calculator
Solve or verify a proportion a/b = c/d from three or four values.
1cr
Ratio Calculatorratio-calculator
Solve a:b = c:d proportions, simplify or scale ratios, and generate equivalent ratio tables.
1cr
Unit Rate Calculatorunit-rate-calculator
Calculate a unit rate or compare two unit rates.
1cr
Sequence Tools
Catalan Number Generatorcatalan-number-generator
Calculate the nth Catalan number and nearby sequence values.
1cr
Collatz Conjecture Calculatorcollatz-conjecture-calculator
Generate and analyze the deterministic Collatz hailstone sequence.
1cr
Sequences
Arithmetic Sequence Calculatorarithmetic-sequence-calculator
Calculate the nth term and partial sum of an arithmetic sequence.
1cr
Cube Numbers Listcube-numbers-list
List cube numbers n³ for bases up to 1000 with sums and prime-base counts.
1cr
Geometric Sequence Calculatorgeometric-sequence-calculator
Calculate nth term, partial sum, and sample terms for a geometric sequence.
1cr
Happy Number Calculatorhappy-number-calculator
Check whether a number is happy or list happy numbers up to a limit.
1cr
List of Fibonacci Numberslist-of-fibonacci-numbers
Generate Fibonacci numbers by count, maximum value, or index range.
1cr
Pascal's Triangle Generatorpascal-s-triangle-generator
Generate Pascal's triangle rows and related row sums.
1cr
Sequence Calculatorsequence-calculator
Generate arithmetic, geometric, or Fibonacci-style sequence terms and sums.
1cr
Skip Counting Generatorskip-counting-generator
Generate an arithmetic skip-counting sequence.
1cr
Square Numbers Listsquare-numbers-list
List square numbers, find squares in a range, or check a perfect square.
1cr
Sum of Cubes Calculatorsum-of-cubes-calculator
Calculate 1^3 + 2^3 + ... + n^3.
1cr
Sum of Positive Integers Calculatorsum-of-positive-integers-calculator
Sum consecutive integers n1..n2 exactly with Gauss's pairing formula.
1cr
Sum of Squares Calculatorsum-of-squares-calculator
Calculate 1^2 + 2^2 + ... + n^2.
1cr
Set Theory
Inclusion Exclusion Calculatorinclusion-exclusion-calculator
Apply inclusion-exclusion for one, two, or three finite sets.
1cr
Set Theory Calculatorset-theory-calculator
Perform common finite set operations.
1cr
Special Functions
Beta Function Calculatorbeta-function-calculator
Calculate the Euler beta function B(x, y) via the gamma function relationship.
1cr
Sports
Bike Gear Ratio Calculatorbike-gear-ratio-calculator
Calculate bicycle gear ratio, gear inches, rollout, gain ratio, and speed.
1cr
Bowling Score Calculatorbowling-score-calculator
Score a ten-pin bowling game from roll values.
1cr
Cricket Run Rate Calculatorcricket-run-rate-calculator
Calculate current, projected, and required cricket run rates from cricket over notation.
1cr
Usage Rate Calculatorusage-rate-calculator
Calculate basketball usage rate from player and team shot, free throw, turnover, and minute stats.
1cr
Statistics
ANOVA Calculatoranova-calculator
Run one-way ANOVA with F statistic, p-value, table components, and effect sizes.
1cr
Arithmetic Mean Calculatorarithmetic-mean-calculator
Calculate arithmetic mean, median, modes, range, variance, and standard deviation from a number list.
1cr
Average Calculatoraverage-calculator
Calculate mean, median, mode, range, variance, and optional weighted average.
1cr
Average Deviation Calculatoraverage-deviation-calculator
Calculate mean and median absolute deviation for a numeric dataset.
1cr
Box and Whisker Plot Makerbox-and-whisker-plot-maker
Compute box plot statistics, whiskers, fences, and outliers.
1cr
Chi Square Test Calculatorchi-square-test-calculator
Run a chi-square goodness-of-fit test for observed and expected counts.
1cr
Coefficient of Variation Calculatorcoefficient-of-variation-calculator
Calculate coefficient of variation from sample or population standard deviation.
1cr
Cohen's d Calculatorcohens-d-calculator
Calculate Cohen's d, Hedges' g, overlap, and effect-size interpretation.
1cr
Correlation Coefficient Calculatorcorrelation-coefficient-calculator
Calculate Pearson, Spearman, and Kendall correlation coefficients.
1cr
Effect Size Calculatoreffect-size-calculator
Calculate Cohen's d, Hedges' g, Glass's delta, and related effect-size statistics for two groups.
1cr
Entropy Calculatorentropy-calculator
Calculate Shannon entropy of a probability distribution in bits, nats, or dits.
1cr
Find Minimum and Maximumfind-minimum-maximum
Find min, max, range, mean, median, positions, and sorted values for a number list.
1cr
Five Number Summary Calculatorfive-number-summary-calculator
Calculate minimum, Q1, median, Q3, maximum, IQR, and outlier fences.
1cr
Geometric Mean Calculatorgeometric-mean-calculator
Calculate geometric mean and compare it with arithmetic, harmonic, median, minimum, and maximum values.
1cr
Gini Coefficient Calculatorgini-coefficient-calculator
Calculate a Gini coefficient and Lorenz curve points from nonnegative data.
1cr
Harmonic Mean Calculatorharmonic-mean-calculator
Calculate harmonic mean for positive non-zero values with comparison means and reciprocal totals.
1cr
Histogram Makerhistogram-maker
Create histogram bin counts and relative frequencies from numeric data.
1cr
Interquartile Range Calculatorinterquartile-range-calculator
Calculate IQR, quartiles, and 1.5-IQR outlier fences.
1cr
Mean Absolute Deviation Calculatormean-absolute-deviation-calculator
Calculate mean or median absolute deviation for a numeric dataset.
1cr
Mean Calculatormean-calculator
Calculate arithmetic mean and supporting summary statistics.
1cr
Mean Median Mode Calculatormean-median-mode-calculator
Calculate mean, median, mode, range, variance, and standard deviation.
1cr
Median Absolute Deviation Calculatormedian-absolute-deviation-calculator
Calculate raw and scaled median absolute deviation as a robust spread measure.
1cr
Median Calculatormedian-calculator
Calculate the median, sorted data, quartiles, and range.
1cr
Midrange Calculatormidrange-calculator
Calculate the midpoint between the minimum and maximum of a dataset.
1cr
Mode Calculatormode-calculator
Find the mode or modes and frequency table for a numeric dataset.
1cr
Outlier Calculatoroutlier-calculator
Detect IQR outliers and return quartiles, bounds, and counts.
1cr
Percentile Calculatorpercentile-calculator
Calculate a percentile value or percentile rank for a numeric dataset.
1cr
Population Variance Calculatorpopulation-variance-calculator
Calculate population variance and population standard deviation.
1cr
Quartile Calculatorquartile-calculator
Calculate Q1, Q2, Q3, IQR, and outlier fences using a selected quartile method.
1cr
Quartile Deviation Calculatorquartile-deviation-calculator
Calculate quartile deviation, IQR fences, and outliers for numeric data.
1cr
Range Calculatorrange-calculator
Range (max − min) of a data set with quartiles, IQR, midrange, and a spread rating.
1cr
Relative Standard Deviation Calculatorrelative-standard-deviation-calculator
Calculate RSD, coefficient of variation, and precision quality for data.
1cr
Root Mean Square Calculatorroot-mean-square-calculator
Calculate root mean square for a numeric list.
1cr
Sample Mean Calculatorsample-mean-calculator
Calculate sample mean plus core descriptive statistics for a numeric dataset.
1cr
Sample Standard Deviation Calculatorsample-standard-deviation-calculator
Calculate sample standard deviation and optional z-score outliers.
1cr
Sample Variance Calculatorsample-variance-calculator
Calculate sample or population variance from a numeric dataset.
1cr
Standard Deviation Calculatorstandard-deviation-calculator
Calculate sample and population standard deviation with quartiles.
1cr
Standard Error Calculatorstandard-error-calculator
Calculate standard error of the mean and a z-based confidence interval.
1cr
Statistics Calculatorstatistics-calculator
Calculate descriptive statistics and histogram-ready distribution data from numeric values.
1cr
Variance Calculatorvariance-calculator
Calculate sample and population variance with related statistics.
1cr
Weibull Distribution Calculatorweibull-distribution-calculator
Calculate Weibull PDF/CDF/reliability, moments, and B-life values.
1cr
Weighted Average Calculatorweighted-average-calculator
Calculate a weighted average from value and weight lists.
1cr
Z-Score Calculatorzscore-calculator
Calculate z-scores, inverse values, percentiles, and normal probabilities.
1cr
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.
1cr
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.
1cr
Time
Commute Life Wasted Calculatorcommute-life-wasted-calculator
Estimate weekly, yearly, and career time spent commuting.
1cr
Trigonometry
Arccos Calculatorarccos-calculator
Calculate inverse cosine in radians and degrees.
1cr
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.
1cr
Arctan2 Calculatorarctan2-calculator
Calculate atan2(y, x), normalized angle, radius, slope, and quadrant.
1cr
Cosine Calculatorcosine-calculator
Calculate cosine with radians/degrees conversion, quadrant, and special-angle recognition.
1cr
Cosecant/Secant/Cotangent Calculatorcsc-sec-cot-calculator
Calculate csc, sec, cot, sine, and cosine for an angle.
1cr
Degree to Radian Converterdegree-to-radian-converter
Convert degrees to radians with pi-fraction, quadrant, and trig values.
1cr
DMS to Decimal Degrees Converterdms-to-decimal-converter
Convert degrees, minutes, and seconds to signed decimal degrees.
1cr
Law of Cosines Calculatorlaw-of-cosines-calculator
Use the law of cosines to solve a side or included angle.
1cr
Law of Sines Calculatorlaw-of-sines-calculator
Use the law of sines to solve a side or possible angle.
1cr
Sine Calculatorsine-calculator
Calculate sine with radians/degrees conversion, quadrant, and special-angle recognition.
1cr
Tangent Calculatortangent-calculator
Calculate tangent and flag vertical-asymptote inputs.
1cr
Unit Circle Calculatorunit-circle-calculator
Calculate unit-circle sine, cosine, tangent, radians, degrees, and point coordinates.
1cr
Unit Conversion
Length Converterlength-converter
Convert a length value across metric, imperial, and nautical units.
1cr
Unit Converters
Acres to Hectares Converteracres-to-hectares-converter
Convert between acres and hectares with related area units.
1cr
Acres to Perches Converteracres-to-perches-converter
Convert acres and perches for land area calculations.
1cr
Acres to Square Feet Converteracres-to-square-feet-converter
Convert between acres and square feet with related area units.
1cr
Acres to Square Meters Converteracres-to-square-meters-converter
Convert between acres and square meters with related area units.
1cr
Acres to Square Miles Converteracres-to-square-miles-converter
Convert acres and square miles, including related land-area units.
1cr
Acres to Square Yards Converteracres-to-square-yards-converter
Convert acres and square yards, including related area units.
1cr
Angle Converterangle-converter
Convert angles between degrees, radians, gradians, turns, arcminutes, arcseconds, and milliradians.
1cr
CM to Inches Convertercm-to-inches-converter
Convert centimeters to inches, feet/inches, and nearest 1/16-inch fraction.
1cr
Cups to Tablespoons Convertercups-to-tablespoons-converter
Convert US cups and tablespoons, including teaspoons and fluid ounces.
1cr
Feet to Meters Converterfeet-to-meters-converter
Convert feet and optional inches to meters, centimeters, and millimeters.
1cr
Gallons to Cups Convertergallons-to-cups-converter
Convert US gallons and cups, with quart and pint equivalents.
1cr
Grams to Ounces Convertergrams-to-ounces-converter
Convert grams to ounces, pounds, kilograms, and milligrams.
1cr
Grams to Pounds Convertergrams-to-pounds-converter
Convert grams to pounds, ounces, and kilograms.
1cr
Inches to CM Converterinches-to-cm-converter
Convert inches to centimeters, millimeters, meters, and feet.
1cr
kg to lbs Converterkg-to-lbs-converter
Convert kilograms and pounds with ounce breakdown.
1cr
kPa to psi Converterkpa-to-psi-converter
Convert kilopascals to psi, bar, atm, and mmHg.
1cr
Liters to Cups Converterliters-to-cups-converter
Convert liters to US, metric, and imperial cups.
1cr
Meters to Feet Convertermeters-to-feet-converter
Convert meters to decimal feet and feet-and-inches.
1cr
Ounce to Gram Converterounce-to-gram-converter
Convert ounces to grams, kilograms, milligrams, and pounds.
1cr
Ounces to Cups Converterounces-to-cups-converter
Convert US fluid ounces and cups with spoon and milliliter equivalents.
1cr
Percent to PPM Converterpercent-to-ppm-converter
Convert percent to ppm or ppm to percent.
1cr
Perches to Acres Converterperches-to-acres-converter
Convert perches and acres for land area calculations.
1cr
Pounds to Grams Converterpounds-to-grams-converter
Convert pounds to grams, kilograms, ounces, and milligrams.
1cr
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.
1cr
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.
1cr
Volume
Cups to Gallons Convertercups-to-gallons-converter
Convert US cups and gallons with related volume units.
1cr
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.
1cr
Volume of a Pyramid Calculatorvolume-of-a-pyramid-calculator
Calculate volume, base area, slant height, and surface area for square, rectangular, or triangular pyramids.
1cr
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.
1cr
Volume Converters
Cubic Meters to Cubic Feetcubic-meters-to-cubic-feet
Convert cubic meters and cubic feet with common volume equivalents.
1cr
Gallons to Liters Convertergallons-to-liters-converter
Convert US or UK gallons to liters, with a reverse conversion mode.
1cr

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.
1cr
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.
1cr

Webmaster 10 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.
1cr
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
HTML
HTML Compressorhtml-compressor
Compress HTML by removing comments and extra whitespace.
1cr
HTML Entity Encoder Decoderhtml-entity-encoder-decoder
Encode or decode HTML entities for text and markup snippets.
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

Business 4 endpoints full page →

Cost Calculators
Print Cost Calculatorprint-cost-calculator
Calculate ink, toner, paper, print job, monthly, and yearly printing costs.
1cr
Productivity
Revenue Per Employee Calculatorrevenue-per-employee-calculator
Calculate revenue per employee for a period and annualized basis.
1cr
Profitability
Contribution Margin Calculatorcontribution-margin-calculator
Calculate unit and total contribution margin, ratio, profit, and break-even units.
1cr
Small Business Calculators
Lemonade Stand Calculatorlemonade-stand-calculator
Calculate batch cost, cup cost, break-even cups, and daily lemonade stand profit.
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.
1cr
Palette
Color Scheme Generatorcolor-scheme-generator
Generate complementary, analogous, triadic, square, tetradic, and monochromatic palettes.
1cr

Construction 10 endpoints full page →

Construction And DIY Calculators
Lumber Calculatorlumber-calculator
Calculate board feet, coverage, waste, linear feet, and lumber cost.
1cr
Layout
Squareness Checkersquareness-checker
Check a corner against the Pythagorean 3-4-5 squareness rule.
1cr
Stair Calculatorstair-calculator
Estimate stair risers, treads, run, stringer length, slope, and step profile data.
1cr
Lumber
Board Foot Calculatorboard-foot-calculator
Calculate lumber volume in board feet, cubic volume, weight, and optional cost.
1cr
Materials
Asphalt Calculatorasphalt-calculator
Estimate asphalt volume, tonnage, waste buffer, truckloads, and material cost.
1cr
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
Roofing
Roof Pitch Calculatorroof-pitch-calculator
Calculate roof pitch, angle, slope percent, and rafter multiplier.
1cr

Conversion 4 endpoints full page →

Fuel
Fuel Efficiency Converterfuel-efficiency-converter-mpg-l-100km-km-l
Convert MPG, L/100km, km/L, and miles/L fuel-efficiency values.
1cr
Scale
Scale Model Conversion Calculatorscale-model-conversion-calculator
Convert a length from one model scale to another.
1cr
Unit Converters
Volume Convertervolume-converter
Convert volume among metric, US customary, cooking, and cubic units.
1cr
Weight (Mass) Converterweight-converter
Convert mass among metric, imperial, ton, stone, and carat units.
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 12 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
Sourdough Calculatorsourdough-calculator
Calculate sourdough flour, water, starter, salt, and dough weight.
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
Fermentation Time Calculatorfermentation-time-calculator
Estimate fermentation time using a Q10 temperature adjustment model.
1cr
Portions
Spaghetti Portion Calculatorspaghetti-portion-calculator
Calculate dry and cooked spaghetti portions for a serving count.
1cr
Ratios
Baker's Percentage Calculatorbaker-s-percentage-calculator
Scale bread ingredients from flour weight and baker's percentages.
1cr
Recipes
Recipe Scalerrecipe-scaler
Scale ingredient quantities from one serving count to another.
1cr

Craft 5 endpoints full page →

Craft Tools
Knitting Needle Size Converterknitting-needle-size-converter
Convert knitting needle sizes among metric, US, UK/Canada, and Japanese systems.
1cr
Origami Paper Size Calculatororigami-paper-size-calculator
Calculate paper square size from target origami model size and model ratio.
1cr
Pottery Clay Shrinkage Calculatorpottery-clay-shrinkage-calculator
Calculate fired clay dimensions, reverse wet sizing, or measured shrinkage rate.
1cr
Quilt Binding Calculatorquilt-binding-calculator
Calculate quilt binding length, strip count, finished width, and fabric yardage.
1cr
Sizing
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 11 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
Data Conversion
CSV to JSON Convertercsv-to-json-converter
Convert CSV text to JSON with delimiter auto-detection and type inference.
1cr
Encoding
Base64 Decoderbase64-decoder
Decode standard or URL-safe Base64 text and return byte and character analysis.
1cr
Base64 Encoderbase64-encoder
Encode UTF-8 text as standard, URL-safe, or MIME line-wrapped Base64.
1cr
URL Decoderurl-decoder
Decode percent-encoded URL text with optional plus-as-space handling and multi-layer detection.
1cr
URL Encoderurl-encoder
Percent-encode text for URLs using RFC 3986, query-string, path, or full encoding modes.
1cr
Scheduling
Cron Job Generatorcron-job-generator
Generate a cron expression from common schedule presets.
1cr
Crontab Expression Generatorcrontab-expression-generator
Build and validate a crontab expression from individual fields.
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

Education 6 endpoints full page →

Attendance
Attendance Percentage Calculatorattendance-percentage-calculator
Calculate attendance percentage, classes needed for a target, and safe skips.
1cr
Grades
CGPA to Percentage Convertercgpa-to-percentage-converter
Convert CGPA to percentage using common 10-, 5-, and 4-point formulas.
1cr
GPA Calculatorgpa-calculator
Calculate term and cumulative GPA from letter grades and credits.
1cr
Grade Calculatorgrade-calculator
Calculate weighted grades and the score needed on remaining work.
1cr
Student Calculators
Learning Curve Calculatorlearning-curve-calculator
Project time per repetition, cumulative practice time, and target repetitions with a power-law learning curve.
1cr
Percentage to CGPA Converterpercentage-to-cgpa-converter
Convert percentage to CGPA across common 10-point, 5-point, and 4-point formulas.
1cr

Electronics 7 endpoints full page →

AC Circuits
3-Phase Power Calculator3-phase-power-calculator
Calculate balanced three-phase real, apparent, and reactive power.
1cr
Amps to Watts Calculatoramps-to-watts-calculator
Convert current and voltage into real, apparent, and reactive power.
1cr
Inductive Reactance Calculatorinductive-reactance-calculator
Solve XL = 2πfL for inductive reactance, frequency, or inductance.
1cr
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 3 endpoints full page →

Electrical
Wire Gauge Calculatorwire-gauge-calculator
Calculate AWG diameter, area, resistance, ampacity, and optional voltage drop.
1cr
Electronics Tools
Impedance Calculatorimpedance-calculator
Calculate series or parallel RLC impedance, phase, resonance, and power factor.
1cr
Physics Calculators
Hydraulic Cylinder Force Calculatorhydraulic-cylinder-force-calculator
Calculate hydraulic cylinder extend and retract force from pressure and diameters.
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

Fitness 3 endpoints full page →

Pace
Running Pace Calculatorrunning-pace-calculator
Calculate running pace per kilometer and mile plus speed.
1cr
Sports Calculators
Swimming Pace Calculatorswimming-pace-calculator
Calculate swim pace per 100m/100yd, speed, lap splits, race estimates, and pace zone.
1cr
Vertical Jump Calculatorvertical-jump-calculator
Calculate vertical jump height, rating, percentile estimate, and optional power estimates.
1cr

Food 2 endpoints full page →

Pizza Party Plannerpizza-party-planner
Estimate pizzas, slices, vegetarian split, leftovers, and optional cost for a group.
1cr
Taco Bar Calculatortaco-bar-calculator
Estimate taco bar shells, protein, toppings, sides, and extras for a group.
1cr

Gaming 1 endpoint full page →

Game Sensitivity Convertergame-sensitivity-converter
Convert FPS mouse sensitivity using cm per 360 degrees.
1cr

Health 8 endpoints full page →

Body Metrics
BMI Calculatorbmi-calculator
Calculate Body Mass Index, BMI Prime, and healthy weight range in metric or imperial units.
1cr
Body Fat Percentage Calculatorbody-fat-percentage-calculator
Estimate body fat percentage with the US Navy method and age-adjusted healthy ranges.
1cr
Body Surface Area Calculatorbody-surface-area-calculator
Estimate body surface area using Mosteller, Du Bois, or Haycock formulas.
1cr
Fitness
Heart Rate Zone Calculatorheart-rate-zone-calculator
Estimate heart-rate training zones using max-heart-rate or Karvonen formulas.
1cr
Hydration
Water Intake Calculatorwater-intake-calculator
Estimate daily water intake from body weight, activity, and hot-weather adjustment.
1cr
Kidney Function
Creatinine Clearance Calculatorcreatinine-clearance-calculator
Estimate creatinine clearance with the Cockcroft-Gault equation and CKD stage.
1cr
Nutrition
Calorie Deficit Calculatorcalorie-deficit-calculator
Estimate daily calorie deficit, target intake, and projected weight-loss trend.
1cr
Protein Intake Calculatorprotein-intake-calculator
Estimate daily protein intake and per-meal targets from weight and training goal.
1cr

Home 4 endpoints full page →

Energy Calculators
Light Bulb Savings Calculatorlight-bulb-savings-calculator
Compare bulb energy, replacement cost, total savings, and payback period.
1cr
Garden Calculators
Plant Spacing Calculatorplant-spacing-calculator
Estimate plant counts for square and triangular garden spacing layouts.
1cr
Utilities
Gas vs Electric Cost Comparisongas-vs-electric-cost-comparison
Compare gas and electric annual running costs and CO2 estimates.
1cr
Shower Cost Calculatorshower-cost-calculator
Estimate water use, energy use, and cost for showers.
1cr

Lifestyle 14 endpoints full page →

Crafts
Beading Pattern Calculatorbeading-pattern-calculator
Calculate beads needed from strand length and a repeating bead pattern.
1cr
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
Home
Dishwasher Load Optimizerdishwasher-load-optimizer
Estimate dishwasher rack utilization, cycles needed, and item placement.
1cr
Numerology
Angel Number Calculatorangel-number-calculator
Find recurring angel-number interpretations or derive one from a birth date.
1cr
Pets
Aquarium Heater Wattage Calculatoraquarium-heater-wattage-calculator
Estimate aquarium heater wattage from tank size and temperature gap.
1cr
Bird Cage Size Calculatorbird-cage-size-calculator
Recommend minimum bird cage dimensions and bar spacing by species.
1cr
Cat Litter Box Calculatorcat-litter-box-calculator
Estimate recommended cat litter boxes, placement, and monthly litter use.
1cr
Cat Years Calculatorcat-years-calculator
Convert cat age into human-equivalent years and life stage.
1cr
Dog Years Calculatordog-years-calculator
Convert dog age to human-equivalent years by breed size.
1cr
Size Conversion
Clothing Size Converterclothing-size-converter
Convert clothing sizes between alpha, US, UK, EU, JP, KR, and measurements.
1cr

Marketing 11 endpoints full page →

Advertising
CTR Calculatorctr-calculator
Calculate click-through rate, required clicks for a target CTR, or bulk campaign CTR.
1cr
Email
Email Open Rate Calculatoremail-open-rate-calculator
Calculate email delivery rate and open rate from campaign counts.
1cr
Unsubscribe Rate Calculatorunsubscribe-rate-calculator
Calculate campaign unsubscribe rate and subscriber-list loss rate.
1cr
Funnels
Conversion Rate Calculatorconversion-rate-calculator
Calculate conversion rate from visitors and conversions.
1cr
ROI
Social Media ROI Calculatorsocial-media-roi-calculator
Calculate social media campaign ROI, ROAS, conversion rate, and unit costs.
2cr
Retention
Churn Rate Calculatorchurn-rate-calculator
Calculate churn, retention, ending customers, and net customer growth.
1cr
SaaS Metrics
ARPU Calculatorarpu-calculator
Calculate ARPU for a period plus monthly and annualized ARPU.
1cr
Surveys
Net Promoter Score Calculatornet-promoter-score-calculator
Calculate NPS from promoter, passive, and detractor counts.
1cr
Unit Costs
Cost Per Lead Calculatorcost-per-lead-calculator
Calculate cost per lead and optional funnel metrics.
1cr
Unit Economics
Customer Acquisition Cost Calculatorcustomer-acquisition-cost-calculator
Calculate CAC from marketing spend, sales spend, and new customers.
1cr
Customer Lifetime Value Calculatorcustomer-lifetime-value-calculator
Estimate LTV from order value, purchase frequency, gross margin, and lifespan.
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

Network 3 endpoints full page →

IP
IP Address to Hex Converterip-address-to-hex-converter
Convert IPv4 or IPv6 addresses to integer, hex, and binary formats.
1cr
IP Subnet Calculatorip-subnet-calculator
Calculate CIDR subnet address ranges, masks, and host counts.
1cr
MAC
MAC Address Analyzermac-address-analyzer
Normalize and inspect MAC address type and administration bits.
1cr

Physics 2 endpoints full page →

Mechanics
Friction Calculatorfriction-calculator
Calculate static and kinetic friction, sliding state, and acceleration from mass or normal force.
1cr
Thermodynamics
Boiling Point Calculatorboiling-point-calculator
Calculate water boiling point from altitude or atmospheric pressure.
1cr

Productivity 1 endpoint full page →

Keyboard Mileage Calculatorkeyboard-mileage-calculator
Estimate finger travel distance from typing speed and time spent typing.
1cr

Science 64 endpoints full page →

Astronomy
Astronomical Unit Converterastronomical-unit-converter
Convert astronomical distances among AU, light-time, parsecs, kilometers, and miles.
1cr
Chemical Calculators
Dilution Calculatordilution-calculator
Solve M1V1 = M2V2 for stock concentration, stock volume, final concentration, or final volume.
1cr
Molality Calculatormolality-calculator
Calculate molality and colligative freezing and boiling point shifts.
1cr
Molarity Calculatormolarity-calculator
Calculate molarity, solute mass, or solution volume from mass, molar mass, and volume.
1cr
Mole/Gram/Particle Convertermole-gram-particle-converter
Convert among moles, grams, and particles using molar mass and Avogadro's constant.
1cr
Nernst Equation Calculatornernst-equation-calculator
Calculate electrochemical cell potential under non-standard conditions.
1cr
Osmotic Pressure Calculatorosmotic-pressure-calculator
Calculate osmotic pressure from molarity, temperature, and van't Hoff factor.
1cr
pKa to Ka Converterpka-to-ka-converter
Convert between pKa, Ka, pKb, and Kb for an acid-base conjugate pair.
1cr
Chemistry
Beer-Lambert Law Calculatorbeer-lambert-law-calculator
Solve A = epsilon l c for absorbance, molar absorptivity, concentration, or path length.
1cr
Boiling Point Elevation Calculatorboiling-point-elevation-calculator
Calculate boiling point elevation from molality, Kb, and van't Hoff factor.
1cr
Percent Yield Calculatorpercent-yield-calculator
Solve percent yield, actual yield, or theoretical yield.
1cr
Electrical
Parallel Resistor Calculatorparallel-resistor-calculator
Calculate equivalent resistance and current sharing for resistors in parallel.
1cr
Power Factor Calculatorpower-factor-calculator
Calculate power factor, reactive power, or capacitor correction values.
1cr
RC Time Constant Calculatorrc-time-constant-calculator
Calculate RC circuit time constant, cutoff frequency, and charging or discharging levels.
1cr
Electronics
555 Timer Calculator555-timer-calculator
Calculate 555 timer astable frequency, period, duty cycle, or monostable pulse width.
1cr
Capacitor Calculatorcapacitor-calculator
Calculate capacitor charge, stored energy, reactance, RC timing, or decode ceramic capacitor codes.
1cr
Decibel (dB) Calculatordecibel-db-calculator
Calculate power dB, voltage dB, dB ratios, and dBm/dBW/watt conversions.
1cr
Ohm's Law Calculatorohm-s-law-calculator
Calculate voltage, current, resistance, and power from any two known values.
1cr
Parallel Capacitor Calculatorparallel-capacitor-calculator
Calculate equivalent capacitance for capacitors in parallel.
1cr
Resistor Color Code Calculatorresistor-color-code-calculator
Calculate 4-band, 5-band, and 6-band resistor values from color bands.
1cr
Resonant Frequency Calculatorresonant-frequency-calculator
Calculate LC/RLC resonant frequency, inductance, capacitance, impedance, Q factor, and bandwidth.
1cr
Series Resistor Calculatorseries-resistor-calculator
Calculate equivalent resistance for resistors in series.
1cr
Fluid Mechanics
Bernoulli Equation Calculatorbernoulli-equation-calculator
Solve one Bernoulli streamline pressure, velocity, or height term.
1cr
Mechanics
Belt Length Calculatorbelt-length-calculator
Calculate open or crossed belt length, wrap angles, and optional belt speed.
1cr
Gear Ratio Calculator (Mechanical)gear-ratio-calculator-mechanical
Calculate gear ratio, output RPM, torque, and mechanical advantage.
1cr
Physics
Density Calculatordensity-calculator
Solve density, mass, or volume with common unit conversions.
1cr
Falling Through Earth Calculatorfalling-through-earth-calculator
Calculate idealized uniform-density gravity-train travel time and speed.
1cr
Force Calculatorforce-calculator
Solve Newton's second law for force, mass, or acceleration with common unit conversions.
1cr
Heat Transfer Calculatorheat-transfer-calculator
Calculate heat transfer by conduction, convection, or radiation.
1cr
Kinetic Energy Calculatorkinetic-energy-calculator
Solve kinetic energy, mass, or velocity with KE = 1/2 m v^2 and unit conversions.
1cr
Momentum Calculatormomentum-calculator
Calculate linear momentum and kinetic energy from mass and velocity.
1cr
Potential Energy Calculatorpotential-energy-calculator
Calculate gravitational or elastic potential energy and solve for missing variables.
1cr
Thermal Expansion Calculatorthermal-expansion-calculator
Calculate linear, area, or volume thermal expansion for common materials.
1cr
Torque Calculatortorque-calculator
Solve torque, force, lever arm distance, or angle using tau = F r sin(theta).
1cr
Velocity Calculatorvelocity-calculator
Calculate average velocity, distance, time, or relative velocity with distance, time, and speed units.
1cr
Work and Power Calculatorwork-and-power-calculator
Calculate mechanical work and power with common unit conversions.
1cr
Work Calculatorwork-calculator
Calculate mechanical work from force, distance, and angle.
1cr
Physics Calculators
Buoyancy Calculatorbuoyancy-calculator
Calculate buoyant force, object density, apparent weight, and float/sink verdict.
1cr
de Broglie Wavelength Calculatorde-broglie-wavelength-calculator
Calculate a particle's de Broglie wavelength from velocity or kinetic energy.
1cr
E=mc² Calculatore-mc-calculator
Convert mass and energy using E=mc² with configurable conversion efficiency.
1cr
Electricity Calculatorelectricity-calculator
Solve voltage, current, resistance, and power from any two known Ohm's law values.
1cr
Escape Velocity Calculatorescape-velocity-calculator
Calculate escape velocity for preset or custom celestial bodies.
1cr
Gravitational Force Calculatorgravitational-force-calculator
Solve Newton's universal gravitation equation for force, mass, or distance.
1cr
Ideal Gas Law Calculatorideal-gas-law-calculator
Solve PV=nRT for pressure, volume, moles, or temperature with unit conversion.
1cr
Kepler's Third Law Calculatorkepler-s-third-law-calculator
Calculate orbital period and mean velocity from semi-major axis and central mass.
1cr
Photon Energy Calculatorphoton-energy-calculator
Convert photon wavelength, frequency, and energy using E=hf=hc/lambda.
1cr
Pressure
Bar to PSI Converterbar-to-psi-converter
Convert bar and PSI, including kPa, MPa, atm, torr, inHg, and Pa.
1cr
psi to kPa Converterpsi-to-kpa-converter
Convert pounds per square inch to kilopascals and related pressure units.
1cr
Temperature
Celsius to Fahrenheit Calculatorcelsius-to-fahrenheit-calculator
Convert Celsius to Fahrenheit and related temperature scales.
1cr
Celsius to Kelvin Convertercelsius-to-kelvin-converter
Convert Celsius to Kelvin and related temperature scales.
1cr
Celsius to Rankine Convertercelsius-to-rankine-converter
Convert Celsius to Rankine and related temperature scales.
1cr
Fahrenheit to Celsius Calculatorfahrenheit-to-celsius-calculator
Convert Fahrenheit to Celsius and related temperature scales.
1cr
Fahrenheit to Kelvin Converterfahrenheit-to-kelvin-converter
Convert Fahrenheit to Kelvin and related temperature scales.
1cr
Fahrenheit to Rankine Converterfahrenheit-to-rankine-converter
Convert Fahrenheit to Rankine and related temperature scales.
1cr
Kelvin to Celsius Converterkelvin-to-celsius-converter
Convert Kelvin to Celsius and related temperature scales.
1cr
Kelvin to Fahrenheit Converterkelvin-to-fahrenheit-converter
Convert Kelvin to Fahrenheit and related temperature scales.
1cr
Rankine to Celsius Converterrankine-to-celsius-converter
Convert Rankine to Celsius and related temperature scales.
1cr
Rankine to Fahrenheit Converterrankine-to-fahrenheit-converter
Convert Rankine to Fahrenheit and related temperature scales.
1cr
Unit Converters
Energy Converterenergy-converter
Convert energy between joules, calories, BTU, watt-hours, electronvolts, ergs, and therms.
1cr
Power Converterpower-converter
Convert power among watts, kilowatts, horsepower, BTU per hour, refrigeration tons, and related units.
1cr
Ultimate Frequency & Wavelength Converterultimate-frequency-wavelength-converter
Convert between frequency and wavelength using a configurable propagation speed and identify the spectrum band.
1cr
Weather
Dew Point Calculatordew-point-calculator
Calculate dew point temperature from air temperature and relative humidity using the Magnus formula.
1cr
Heat Index Calculatorheat-index-calculator
Calculate the NWS heat index (apparent temperature) from air temperature and relative humidity.
1cr
Wind Chill Calculatorwind-chill-calculator
Calculate NWS wind chill and frostbite risk from air temperature and wind speed.
1cr

Sports 15 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.
1cr
Batting Average Calculatorbatting-average-calculator
Calculate baseball batting average from hits and at-bats.
1cr
ERA Calculatorera-calculator
Calculate baseball earned run average.
1cr
FIP Calculatorfip-calculator
Calculate baseball fielding independent pitching.
1cr
On Base Percentage Calculatoron-base-percentage-calculator
Calculate on-base percentage with batting average and optional OPS.
1cr
OPS Calculatorops-calculator
Calculate baseball on-base plus slugging with OBP and SLG components.
1cr
Slugging Percentage Calculatorslugging-percentage-calculator
Calculate baseball slugging percentage from hit types.
1cr
Total Bases Calculatortotal-bases-calculator
Calculate baseball total bases from singles, doubles, triples, and home runs.
1cr
WAR Calculatorwar-calculator
Estimate simplified baseball WAR for position players or pitchers.
1cr
WHIP Calculatorwhip-calculator
Calculate baseball WHIP with baseball innings notation support.
1cr
Basketball
Effective Field Goal Percentage Calculatorefg-calculator
Calculate basketball effective field goal percentage.
1cr
Field Goal Percentage Calculatorfield-goal-percentage-calculator
Calculate made-shot percentage and related shooting metrics.
1cr
Rebound Rate Calculatorrebound-rate-calculator
Calculate basketball offensive, defensive, and total rebound rates.
1cr
True Shooting Percentage Calculatortrue-shooting-percentage-calculator
Calculate basketball true shooting percentage from points, FGA, and FTA.
1cr
Climbing
Climbing Grade Converterclimbing-grade-converter
Convert roped and bouldering climbing grades across common systems.
1cr

Time 5 endpoints full page →

Calendar
Is It Leap Yearis-it-leap-year
Check whether a Gregorian calendar year is a leap year.
1cr
Countdown
Countdown Timercountdown-timer
Calculate an exact countdown between two ISO datetimes.
1cr
Date Format
Date to Roman Numerals Converterdate-to-roman-numerals-converter
Convert a calendar date into Roman numeral date formats.
1cr
Dates
Halfway Date Calculatorhalfway-date-calculator
Find the midpoint and quarter points between two dates.
1cr
Duration
Hours Calculatorhours-calculator
Calculate gross and net hours between two times, including breaks.
1cr

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.
1cr
Date Tools
Date Calculatordate-calculator
Add or subtract years, months, weeks, and days from a date.
1cr
Date Difference Calculatordate-difference-calculator
Calculate days, weeks, approximate months/years, and business days between two dates.
1cr
Time Between Two Datestime-between-two-dates
Calculate exact elapsed time between two ISO datetimes.
1cr
Season
Winter Solstice Daywinter-solstice-day
Return winter solstice date/time for Northern or Southern Hemisphere, 2024-2030.
1cr
Time Calculators
Time Duration Calculatortime-duration-calculator
Calculate elapsed time between two times or datetimes.
1cr
Time to Decimal Convertertime-to-decimal-converter
Convert between hours/minutes/seconds and decimal hours.
1cr
Work Hours Calculatorwork-hours-calculator
Calculate weekly work hours, overtime, and optional pay from day entries.
1cr
Time Conversion
Unix Time Converterunix-time-converter
Convert between Unix timestamps and UTC ISO datetimes.
1cr