Math Calculators

Everyday maths made clear. Each calculator explains the method so it doubles as a quick refresher.

Percentage Calculator

Find X% of any number — with a mental-maths shortcut explained.

Percentage Change Calculator

Measure how much a value rose or fell, relative to where it started.

Pythagorean Theorem Calculator

Enter any two sides of a right triangle to find the third.

GCD & LCM Calculator

Greatest common divisor and lowest common multiple of two whole numbers.