All tools
Focused calculators with transparent formulas and practical context.
Compound Interest Calculator
Estimate how an initial deposit and regular contributions may grow over time.
Open tool MathPercentage Calculator
Find a percentage of a number, compare values, or calculate percentage change.
Open tool FinanceLoan Payment Calculator
Estimate a fixed monthly payment and total interest for a standard amortizing loan.
Open tool Date & TimeAge Calculator
Calculate your age in years, months and days on a chosen date.
Open tool Health & FitnessBMI Calculator
Calculate body mass index from height and weight, with context about its limitations.
Open tool FinanceSimple Interest Calculator
Estimate interest that is calculated on the original principal only.
Open tool FinanceSavings Goal Calculator
Estimate a regular contribution needed to reach a savings target.
Open tool FinanceInvestment Return Calculator
Compare an investment’s starting and ending values to measure total return.
Open tool FinanceCAGR Calculator
Find the smoothed annual growth rate between two positive values.
Open tool FinanceDiscount Calculator
Work out a percentage discount and the price remaining before extra charges.
Open tool FinanceProfit Margin Calculator
Calculate gross profit and margin from revenue and direct costs.
Open tool FinanceMarkup Calculator
Add a percentage of cost to estimate a marked-up selling price.
Open tool FinanceBreak-Even Calculator
Estimate the unit sales needed to cover fixed costs at a chosen price.
Open tool MathAverage Calculator
Find the mean, median, range, and repeated values in a numeric list.
Open tool MathRatio Calculator
Reduce two non-negative quantities to their simplest whole-number ratio.
Open tool MathFraction Calculator
Add, subtract, multiply, or divide two fractions and simplify the result.
Open tool MathGCD & LCM Calculator
Find the greatest common divisor and least common multiple of two integers.
Open tool Date & TimeDate Difference Calculator
Measure the calendar-day distance between two dates in either order.
Open tool Date & TimeBusiness Days Calculator
Count Monday-to-Friday dates in a range and optionally exclude holidays.
Open tool Date & TimeTime Duration Calculator
Find elapsed hours and minutes between two times on a 24-hour clock.
Open tool Date & TimeDays Until Date Calculator
See how many calendar days remain until a date or have passed since it.
Open tool EverydayTip Calculator
Estimate a tip, total bill, and per-person share without assuming a currency.
Open tool EverydaySplit Bill Calculator
Divide a shared amount into cent-accurate equal shares.
Open tool EverydayFuel Cost Calculator
Estimate trip fuel use and cost from distance, efficiency, and unit price.
Open tool ConversionLength Converter
Convert common metric and customary length units using standard factors.
Open tool ConversionWeight Converter
Convert mass values between metric units, ounces, and pounds.
Open tool ConversionTemperature Converter
Convert Celsius, Fahrenheit, and Kelvin with absolute-zero validation.
Open tool Text & DeveloperWord Counter
Count words, grapheme characters, non-whitespace characters, and lines in text.
Open tool Text & DeveloperCharacter Counter
Measure visible characters, non-whitespace characters, code points, and UTF-8 bytes.
Open tool Text & DeveloperJSON Formatter
Validate and format JSON locally as readable or compact output.
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