Free percentage calculator
Calculate a percentage of any number, or work out what percentage a part is of a whole.
Percentage Calculator
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What percent is A of B?
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How to calculate percentages
Find a percentage of a number
To find a percentage of a number, multiply the number by the percentage divided by 100. Example: 15% of 200 is 0.15 × 200 = 30. To find what percent a part is of a whole, divide the part by the whole and multiply by 100.
How to calculate percentages
A percentage expresses a value out of 100. To find a percentage of a number, multiply the number by the percentage and divide by 100. For example, 15% of 200 is 30. To find what percentage one value is of another, divide the part by the whole and multiply by 100.
Percentage change and comparison
Percentage change compares an old value with a new value: subtract the old value from the new value, divide by the old value, and multiply by 100. A positive result indicates an increase and a negative result indicates a decrease. The calculation is undefined when the starting value is zero.
Check the meaning of the inputs
Make sure you know whether you need a percentage of a number, a part-to-whole ratio, or a percentage change. These questions use different formulas and can produce different answers. For financial, tax, or contractual decisions, verify the inputs and applicable rounding rules.
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