Percentage Calculator — Fast Percent Math
Solve X percent of Y, find what percent X is of Y, or measure percent change between two values with the formula shown, all with instant answers. Free forever.
Free, no signup needed. Runs 100% in your browser.
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How to use this tool
- Pick one of the three percent calculations.
- Enter your two numbers.
- Copy the result with the formula.
Frequently asked questions
How is percent change calculated?
As (new − old) ÷ |old| × 100. A move from 200 to 250 is a 25 percent increase.
Why does percent change fail at zero?
Dividing by a zero starting value is undefined, so the tool asks for a non-zero starting value.
Is it free?
Yes, free with no signup.
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