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Math Calculators

Free math tools — percentage (p% of x, What % is A of B, % change, reverse), percent increase/decrease, and random number/dice/list generator.

Percentage Calculator

Calculate percentage calculator instantly.

Percentage Increase Calculator

Calculate percentage increase calculator instantly.

Percentage Decrease Calculator

Calculate percentage decrease calculator instantly.

Random Number Generator

Calculate random number generator instantly.

Formulas you can trust

Standard formulas: (p/100)×x, Percentage Change = ((New−Old)/Old)×100, and crypto.getRandomValues for RNG. See also Finance and all calculators.