Percentage Calculator
Enter two numbers to get a percentage of a value, one value as a percent of another, and the percent change.
A percent of B
A as a percent of B
Percent change from A to B
The three formulas
A percent of B = A / 100 x B. A as a percent of B = A / B x 100. Percent change = (B - A) / A x 100.
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 find a percentage of a number?
Divide the percentage by 100, then multiply by the number.
Why is percent change blank?
It cannot be worked out when the starting value A is zero.
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Last updated October 2026. For information only, not financial advice.