Percentage Calculator

How this tool works

A percentage expresses a part of a whole out of 100. This calculator works out a percentage of a value, which is useful for discounts, marks, fees, budgets and quick everyday calculations.

How to use it

1. Enter the percentage in the first field, such as 20.
2. Enter the number you want to calculate it from, such as 150.
3. Select Calculate and read the result below the fields.

Example and practical tips

For example, 20% of 150 is 30 because 150 × 20 ÷ 100 = 30. The same method works for decimal percentages such as 12.5%.

Use the original value in the second field. This page calculates “what is p percent of n”; it does not currently calculate percentage increase, decrease, or “what percent is A of B.” For those questions, first identify the whole amount and use the appropriate formula.

Frequently asked questions

How is the result calculated?

The percentage is divided by 100 and multiplied by the entered number.

Can I use decimal percentages?

Yes. Enter a value such as 7.5 if you need a fractional percentage.