Percentage Calculator
Find a percent of a number, work out what percent one number is of another, or calculate percent change. Results update as you type.
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Frequently asked questions
How do I calculate a percentage of a number?
Multiply the number by the percent, then divide by 100. For example, 20% of 450 is 450 × 20 ÷ 100 = 90.
How is percent change calculated?
Percent change is (new − old) ÷ old × 100. Going from 120 to 150 is a 25% increase. A drop from 150 to 120 is a 20% decrease — the base value matters.
What if the starting value is zero?
Percent change from zero is undefined because you would be dividing by zero. Use “percent of” or increase/decrease instead.
Is my data sent to a server?
No. This calculator runs entirely in your browser. Nothing you type is uploaded.