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Percentage Calculator

Three essential percentage calculators in one: find a percentage of a number, calculate percentage change, and work out what percentage one number is of another.

What is X% of Y?

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Percentage Change

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X is what % of Y?

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Frequently Asked Questions

A quick mental shortcut: to find 10%, move the decimal point one place left. To find 5%, halve the 10% answer. To find 20%, double the 10% answer. For example, 20% of 85 = 8.5 × 2 = 17.
Percentage change = ((New Value − Old Value) / Old Value) × 100. A positive result is an increase; a negative result is a decrease. For example, going from 80 to 100 is a 25% increase.
Percentage points measure the arithmetic difference between two percentages. If interest rates go from 3% to 5%, that's a 2 percentage point increase, but a 66.7% relative increase. These are very different concepts!