Solve any percentage problem in seconds — find X% of a number, see what percentage one number is of another, or calculate percentage change. Free to use with live results as you type, no sign-up needed.
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Type values above to see the live result
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Type values above to see the live result
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Type values above to see the live result
All calculations happen instantly in your browser as you type — nothing is sent anywhere.
How to use the Percentage Calculator
- Pick the tab that matches your question: X% of Y, X is what % of Y, or % change.
- Type your two numbers into the boxes — the answer updates live with every keystroke.
- Read the big result plus the plain-English explanation underneath it.
Frequently asked questions
How do I calculate a percentage of a number?
Use the "X% of Y" tab: divide the percentage by 100 and multiply by the number. For example, 20% of 150 is 0.20 × 150 = 30.
How do I find the percentage increase between two numbers?
Use the "% change" tab: subtract the old value from the new value, divide by the old value, and multiply by 100. Going from 80 to 100 is a 25% increase.
Is my data sent to a server?
No. Every calculation runs locally in your browser — your numbers never leave your device.