Percentage Calculator
Percent of a number, what percent, and the whole. Change the numbers and the result updates instantly.
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How it works
This calculator answers three common questions with the same two numbers. What is A% of B? Multiply B by A and divide by 100. A is what percent of B? Divide A by B and multiply by 100. A is B% of what number? Divide A by B and multiply by 100.
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Example
Example: 15% of 200 is 30. 15 is 7.5% of 200. 15 is 200% of 7.5.
Tips
- Change one input at a time to see what moves the result most.
- Use realistic rates. Check current averages before you decide.
- Results are estimates and do not replace advice from a licensed professional.
Frequently asked questions
Is this calculator free?
Yes. There is no sign-up and nothing is stored on our servers; the math runs in your browser.
How accurate is it?
It uses standard formulas, but real offers include fees, rate changes and taxes that can differ. Treat the result as an estimate.
Sources and method
Page last updated November 2026. See our editorial policy and disclaimer.