Percentage Calculator

Find X% of a number, what percent one number is of another, and percentage increase or decrease.

1. What is X% of Y?

2. X is what % of Y?

3. % change from A to B

How to use the percentage calculator

Use any of the three boxes. The first finds a percentage of a number (15% of 240 = 36). The second tells what percent one number is of another (30 is 25% of 120). The third gives the percentage increase or decrease between an old and a new value.

Formulas

Percentage of a number = (X ÷ 100) × Y
X as a percent of Y = (X ÷ Y) × 100
Percentage change = ((New − Old) ÷ Old) × 100

Learn shortcuts in our percentage notes and practise with Maths & Reasoning practice paper.