Percentage Calculator
Find a percentage of a number, what percent one number is of another, or the percent change between two — all live, no page reload.
% of a Number
X is What % of Y
% Change From X to Y
About the Percentage Calculator
Three calculators in one: work out a percentage of a number, find what percent one number is of another, or measure the percent increase or decrease between two values. Results update as you type.
The formulas: X% of Y = Y × X ÷ 100. What percent A is of B = A ÷ B × 100. Percent change = (new − old) ÷ old × 100.
Frequently asked questions
How do I calculate a percentage of a number?
Multiply the number by the percentage and divide by 100. For example, 15% of 80 = 80 × 15 ÷ 100 = 12.
How do I find what percent one number is of another?
Divide the first number by the second and multiply by 100. For example, 30 is 30 ÷ 120 × 100 = 25% of 120.
How do I calculate percent change?
Subtract the old value from the new one, divide by the old value, and multiply by 100. A result above zero is an increase; below zero is a decrease.