How do I find X% of a number?

Divide the percentage by 100 and multiply by the number. For example, 15% of 200 = (15 ÷ 100) × 200 = 30.

How do I calculate percentage increase or decrease?

Subtract the original value from the new value, divide by the original, and multiply by 100. A positive result is an increase; negative is a decrease.

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Percentage Calculator

Work out percentages, ratios, and increase/decrease with the formula shown.

Percentage (%)

Of value

Result

15% of 200 = (15 ÷ 100) × 200 = 30

About the percentage calculator

Percentages express a number as a fraction of 100. This calculator handles the three most common cases: finding a percentage of a value, finding what percentage one number is of another, and calculating the percentage change between two values. The worked formula is shown with every result.

Frequently asked questions

How do I find X% of a number?: Divide the percentage by 100 and multiply by the number. For example, 15% of 200 = (15 ÷ 100) × 200 = 30.
How do I calculate percentage increase or decrease?: Subtract the original value from the new value, divide by the original, and multiply by 100. A positive result is an increase; negative is a decrease.