Percentage calculator

Three quick percentage tools in one place. Type your numbers — the answer updates instantly.

What is X% of Y?

% of

Result

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X is what percent of Y?

is what % of

Result

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Percentage increase / decrease

From

Change

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Guide

How to calculate percentages

A percentage is just a number out of 100. The word "percent" literally means "per hundred", so 20% is the same as 20 out of 100, or the fraction 20/100 = 0.2. Most everyday percentage questions fall into the three types on this page.

Percent of a number

To find a percent of a number, multiply the number by the percent and divide by 100. For example, 20% of 150 is 150 × 20 ÷ 100 = 30. This is handy for tips, taxes and discounts.

What percent one number is of another

Divide the part by the whole and multiply by 100. If you scored 30 out of 150, that is 30 ÷ 150 × 100 = 20%.

Percentage increase and decrease

Take the difference between the new and old values, divide by the old value, then multiply by 100. A price rising from 80 to 100 is a (100 − 80) ÷ 80 × 100 = 25% increase; falling from 100 to 80 is a 20% decrease.

FAQ

Frequently asked questions

How do I calculate a percentage of a number?

Multiply the number by the percentage and divide by 100. For example, 20% of 150 is 150 × 20 ÷ 100 = 30.

How do I find what percent one number is of another?

Divide the first number by the second and multiply by 100. For example, 30 is 30 ÷ 150 × 100 = 20% of 150.

How do I calculate percentage increase or decrease?

Subtract the old value from the new value, divide by the old value, and multiply by 100. A rise from 80 to 100 is a 25% increase.

Is this percentage calculator free and private?

Yes. It is completely free, and every calculation runs in your browser — the numbers you enter are never uploaded or stored.