How to use the percentage calculator
- Enter the percentage, such as 15.
- Enter the number you want to take a percentage of, such as 200.
- Select Calculate to see the result.
Worked example
15% of 200 = (15 ÷ 100) × 200 = 30. Decimal percentages work too: 2.5% of 800 is 20.
Frequently asked questions
Can I use decimal percentages?
Yes. You can enter values such as 2.5 or 12.75.
Can the percentage be greater than 100?
Yes. For example, 150% of 200 is 300. Negative inputs are also supported for ordinary arithmetic.
Does this calculate percentage change?
This version calculates a percentage of a number. To calculate percentage change, use (new value − old value) ÷ old value × 100; the old value must not be zero.
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Updated 8 November 2026 · Built-in tools, no signup