Percentage Calculator

Find a percent of a number, what percent one number is of another, and percent change in one step.

Number A

Number B

The three results

A% of B multiplies B by A/100. A is what % of B divides A by B and multiplies by 100. Change from A to B is (B − A) ÷ A × 100; a negative result means a decrease.

Example: 20% of 150 is 30. 20 is 13.33% of 150. Going from 20 to 150 is a 650% increase.

Frequently asked questions

How do I calculate a percentage of a number?

Multiply the number by the percentage and divide by 100. For 15% of 80, 80 x 15 / 100 = 12.

How do I calculate percent change?

Subtract the old value from the new value, divide by the old value, and multiply by 100.