Math calculators

Statistics, fractions, percentages, and number-crunching tools for students and professionals.

Percentage calculator

Find X% of Y, work out what percentage one number is of another, or calculate percentage change — formula shown for every result.

Find the Greatest Common Factor and Least Common Multiple of any two integers, with prime factorization and Euclidean algorithm steps.

Mean, median, mode, range, sum, and count with step-by-step breakdowns.

Convert numbers to scientific notation, back to standard form, and multiply or divide in scientific notation.

Convert mm, cm, m, km, in, ft, yd, and mi instantly with the formula shown for each result.

Convert ml, L, m³, fl oz, cups, pints, quarts, and US or UK gallons with formula shown.

Convert mg, g, kg, t, oz, lb, and st instantly. Live result with formula shown.

Convert between Celsius, Fahrenheit, and Kelvin. All three values update at once with the formula shown.