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Percentage calculator

Pick what you want to know, enter the two numbers and you get the answer right away.

It covers the four everyday percentage sums: a part, a share, an increase and a decrease.

How it's calculated

X% of Y = X × Y ÷ 100.
X as a percent of Y = X ÷ Y × 100.
Y plus X% = Y × (1 + X ÷ 100). Y minus X% = Y × (1 − X ÷ 100).

An example

15% of 200 is 30.

30 is 25% of 120.

A price of $60 going up 10% becomes $66.

Frequently asked questions

How do I work out a percentage of a number?

Multiply the number by the percentage and divide by 100. 20% of 350 is 350 × 20 ÷ 100 = 70.

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

Divide the part by the whole and multiply by 100. If you get 45 out of 60 right, that is 45 ÷ 60 × 100 = 75%.

How do I add a percentage to a price?

Multiply it by 1 plus the percentage as a decimal. To add 10%, multiply by 1.10.

Does going up 10% and then down 10% get me back to the start?

No. 100 plus 10% is 110, and 110 minus 10% is 99. The decrease applies to a bigger number.

Key terms

Percentage: An amount written as parts out of 100.
Base: The number the percentage is taken from (Y in this calculator).

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Up-to-date official data

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