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Converters & Math

Convert measurements, temperatures, fractions, percentages and grades with exact relationships and visible intermediate steps.

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Fraction Calculator Add, subtract, multiply and divide fractions, with exact answers in lowest terms. GPA Calculator Term and cumulative GPA, weighted or unweighted, on whichever scale your school uses. Percentage Calculator Calculate percentages, percentage changes, and the original number in seconds. Roman Numeral Converter Convert numbers to Roman numerals and back, in either direction. Running Pace Calculator Pace per kilometer and mile, speed, and same-pace race times. Temperature Converter Convert Celsius to Fahrenheit and back, side by side. Unit Converter Convert metric and Imperial area, length, temperature, volume, and weight units side by side.

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About this collection

Conversions you can check, not just copy

Converters are most useful when they preserve the meaning of the input. Unit tools distinguish dimensions such as length, area and volume; temperature conversion accounts for both scale and offset; fraction and percentage tools keep the operation visible. Where rounding is necessary, the unrounded value is retained for the calculation and only the displayed answer is shortened.

For regulated, scientific or safety-critical work, confirm the required unit definition and precision before relying on a result. A convenient rounded conversion may be appropriate for a recipe and inappropriate for engineering, medication or a legal measurement.

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