Free Percentage Calculator
Three percentage calculations in one tool: find a percentage of a number, what percentage one number is of another, and percentage change.
What is X% of Y?
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X is what % of Y?
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Percentage Change
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About This Tool
This free percentage calculator handles the three most common percentage problems you will encounter in everyday life, studies, and work. Enter your numbers and see the result instantly — no sign-up, no ads, no waiting.
The first calculator finds a specific percentage of any number (for example, 15% of 200). The second tells you what percentage one value represents of another (for example, 30 is what % of 200?). The third calculates the percentage increase or decrease between two values.
All calculations happen in your browser — nothing is sent to a server. Bookmark this page for quick access whenever you need a fast, reliable percentage answer.
Frequently Asked Questions
How do I calculate a percentage of a number?
Multiply the number by the percentage and divide by 100. For example, 20% of 150 is (20 x 150) / 100 = 30. Use the first calculator above to get instant results.
How do I find what percentage one number is of another?
Divide the part by the whole and multiply by 100. For example, 30 out of 200 is (30 / 200) x 100 = 15%. The second calculator handles this automatically.
What is the formula for percentage change?
Percentage change = ((New Value - Old Value) / |Old Value|) x 100. A positive result means an increase; a negative result means a decrease. The third calculator shows this instantly.
Is this calculator free to use?
Yes, completely free with no limits. All calculations run in your browser so your data stays private. No account or sign-up is needed.