Percentage Calculator

Three common percentage problems, solved instantly — no formulas to remember.

What is X% of Y?

Percentage (%)

Of number

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Value

Out of

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From

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How do I calculate a percentage of a number by hand?: Multiply the number by the percentage, then divide by 100. For 15% of 200: 200 × 15 ÷ 100 = 30.
How do I calculate percentage increase or decrease?: Subtract the original value from the new value, divide by the original value, then multiply by 100. A negative result means a decrease.