Percentage calculator

How it works

Pick the question you have: what is X% of a number, what percent one number is of another, or the percentage change between two values.

The formula

X% of N = N × X ÷ 100. A as a percent of B = A ÷ B × 100. Change = (new − old) ÷ old × 100.

Worked example

15% of 200 = 30. 30 is 15% of 200. A price that goes from 80 to 100 rose by (100 − 80) ÷ 80 × 100 = 25%.

Good to know

• A rise and a fall of the same percent do not cancel: +25% then −25% leaves you at 93.75% of the start.
• Percentage points differ from percent: going from 5% to 6% is 1 point but a 20% increase.