What is 20% of 100?

20% of 100 = 20

Working: 100 × 0.2 = 20

20 percent of 100 is 20.

To find a percentage of a number, convert the percentage to a decimal by dividing by 100, then multiply. Here that is 20 ÷ 100 = 0.2, and 100 × 0.2 = 20.

There is usually a faster mental route. Ten percent of 100 is 10 — just move the decimal point one place left. Multiply that by 2 to get 20.

Twenty percent is the most-used percentage in ordinary life: the customary US restaurant tip for good service, the UK's standard VAT rate, and retail's most common headline discount. It is also the easiest after ten percent — find a tenth and double it.

One hundred is the amount that makes percentages trivial, because a percentage is literally 'per hundred' — the percentage and the answer are the same number. That is the whole origin of the notation, and working an example at 100 first is the fastest way to sanity-check any other amount.

Other percentages of 100

Percentage	Of 100
10%	10
15%	15
25%	25
30%	30
50%	50

Try another value

Percent (X)

Of value (Y)

20% of 150 is

Frequently asked questions

What is 20 percent of 100?

20% of 100 is 20. Multiply 100 by 0.2 to get the answer.

What is 20% off 100?

Taking 20% off 100 leaves 80. The discount itself is 20, so subtract that from 100 — or multiply 100 by 0.8 to get to the final price in one step.

How do you calculate a percentage of a number?

Divide the percentage by 100 to turn it into a decimal, then multiply that decimal by the number. For example 20% becomes 0.2, and 0.2 multiplied by the number gives the answer.

For any other value, use the full Percentage Calculator on BrainVert.