Percentage calculator

What is X% of Y?

% of = 30

What percentage is X of Y?

of = 20 %

Percentage change from X to Y

→ = 20 %

Three everyday percentage operations, calculated instantly in your browser.

This percentage calculator bundles the three operations you actually need: X% of a number, what percentage one number is of another, and the percentage change between two values.

Three calculations, one page

Type into any block and the answer updates instantly — handy for discounts, tips, taxes, grades and tracking increases or decreases. The maths runs entirely in your browser.

FAQ

How do you work out X% of a number?

Divide the percentage by 100 and multiply by the number. 20% of 150 is 0.20 × 150 = 30.

How do you find what percentage one number is of another?

Divide the part by the total and multiply by 100. 30 out of 150 is 30 ÷ 150 × 100 = 20%.

How do you calculate percentage change?

Subtract the old value from the new one, divide by the old value and multiply by 100. From 150 to 180 is (180 − 150) ÷ 150 × 100 = +20%.