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 (20 ÷ 100) × 150 = 30. The first calculator on this page does this automatically.

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

Divide the part by the whole and multiply by 100. For example, 30 is (30 ÷ 150) × 100 = 20% of 150.

How is percentage change calculated?

Subtract the original value from the new value, divide by the original value, then multiply by 100. A negative result means a decrease.

Calculators Finance

Percentage Calculator

Find a percentage of a number, work out what percent one value is of another, or calculate percentage change.

Percent

Of value

20% of 150 is

Part value

Whole value

30 is what % of 150

20%

From

Percentage change

+25%

Ad space

About this tool

This calculator covers the three questions people ask about percentages most often: what a percentage of a number is, what percentage one value represents of another, and how much a value has increased or decreased in percentage terms. Every result updates instantly as you type, so you can check several numbers in a row without reloading the page.

How to use this tool

1
Pick the calculation you need
Scroll to whichever of the three sections matches your question — percentage of a number, percentage of total, or percentage change.
2
Enter your numbers
Type into the input fields. There is no submit button — every field recalculates the result as you type.
3
Read the result
The highlighted readout box shows your answer, with a copy button if you need to paste it elsewhere.

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 (20 ÷ 100) × 150 = 30. The first calculator on this page does this automatically.
How do I find what percentage one number is of another?: Divide the part by the whole and multiply by 100. For example, 30 is (30 ÷ 150) × 100 = 20% of 150.
How is percentage change calculated?: Subtract the original value from the new value, divide by the original value, then multiply by 100. A negative result means a decrease.