Percentage Helper

Find % of a number, increase/decrease by %, what percent A is of B, and percentage change.

Percentages
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% of a number

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Increase / Decrease by %

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What percent is A of B?

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Percent change from A to B

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Frequently Asked Questions

How do I calculate a percentage of a number?

Multiply the number by (percent ÷ 100). For example, 15% of 200 = 200 × 0.15 = 30.

How do I increase or decrease a number by a percent?

Increase: multiply by (1 + p/100). Decrease: multiply by (1 − p/100). This tool shows both results.

What percent is A of B?

Compute (A ÷ B) × 100. If B is 0, the percent is undefined.

How do you calculate percent change from A to B?

Use ((B − A) ÷ A) × 100. If A is 0, percent change can’t be computed in the usual way.

What does a negative percent change mean?

A negative percent change means the value decreased from A to B. A positive value means it increased.