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Currency & unitsUSD · Imperial

Using USD and Imperial. You can change either choice.

Currency changes the unit of your amounts, not their value. No exchange rate or country-specific tax, benefit, or lending rule is applied. Money results and loan schedules retain the calculators’ two-decimal precision; this does not apply local cash-rounding rules.

Measurement changes convert valid existing quantities. Incomplete entries stay as typed; finish them using the units shown. Other units stay as labeled. Enter numbers as 1,234.56; a decimal comma is not supported.

Initial suggestions use only your browser’s language region. Choices are saved on this browser; no location lookup is used.

Math Calculators

Percentages, fractions, ratios, coordinates, and unit conversions. Choose a tool below for instant results, formulas, and examples.

Unit ConverterConvert length, area, volume, mass, temperature, speed, time, pressure, energy and angles. Distinguish US and Imperial units and temperature differences.Ratio CalculatorSimplify a ratio and scale it to a new second quantity. Use exact whole-number ratios for recipes, dimensions, and comparisons.Slope CalculatorFind the slope, intercept, rise, run, and distance between two points. Vertical lines are identified explicitly.Percentage CalculatorCalculate a percentage of a number, one number as a percent of another, percentage change, or an increase or decrease. See the formula for each result.Fraction CalculatorAdd, subtract, multiply, or divide fractions and mixed numbers. Get an exact simplified fraction, a mixed number, and a decimal approximation.