Percentage calculator
Three percentage calculators in one: find a percentage of a number, express one number as a percentage of another, and measure percentage change.
How it works
X% of Y = X ÷ 100 × Y. For example, 15% of 200 = 0.15 × 200 = 30.
X as a percentage of Y = X ÷ Y × 100. For example, 30 is 25% of 120.
Percentage change from A to B = (B − A) ÷ |A| × 100. A rise from 80 to 100 is a 25% increase.
Frequently asked questions
How do I calculate a percentage of a number?
Divide the percentage by 100 and multiply by the number: 20% of 50 = 0.2 × 50 = 10.
How do I calculate a percentage increase?
Subtract the old value from the new value, divide by the old value and multiply by 100.