Percentage Calculator
Three percentage calculators in one — find a percentage of a number, a ratio as a percentage, and percentage change.
How to use it
- Pick the calculation you need Three common percentage questions are shown together.
- Type your numbers Each answer updates instantly as you type.
Examples
| 15% of 200 | 30 |
|---|---|
| 30 is what % of 200 | 15% |
| 200 → 220 | +10% |
About this tool
Percentages come up constantly — discounts, tips, tax, grades, statistics and changes over time. This calculator puts the three questions people ask most in one place, so you do not have to remember which formula to use.
Enter your numbers and the answer appears immediately. All calculation happens in your browser, so it is fast and private.
Frequently asked questions
How do I find a percentage of a number?
Divide the percentage by 100 and multiply by the number. For example, 15% of 200 is 0.15 × 200 = 30.
How do I calculate percentage change?
Subtract the old value from the new one, divide by the old value, then multiply by 100. From 200 to 220 is a 10% increase.
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Updated June 12, 2026