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Percentage Calculator

Work out percentages instantly: what is X% of Y, X is what percent of Y, and X is Y% of what. Free percentage calculator with the formulas explained.

What is% of?30
is what % of?25%
is% of what?300

The three percentage questions

Almost every percentage problem is one of three questions, and each has its own row. What is 20% of 150? Multiply 150 by 20 and divide by 100: 30. 30 is what percent of 120? Divide 30 by 120 and multiply by 100: 25%. 45 is 15% of what? Divide 45 by 15 and multiply by 100: 300. Type your own numbers into any row and the answer updates as you type. For a price rise or a change in value over time, use the Percentage Change Calculator.

How to use it

  1. 1

    Pick the right row

    Choose the question that matches your problem.

  2. 2

    Type your numbers

    Decimals work too, with either a point or a comma.

  3. 3

    Read the answer

    The result appears at the end of the row as you type.

Frequently asked questions

How do I calculate a percentage of a number?

Multiply the number by the percentage and divide by 100. 15% of 80 is 80 × 15 ÷ 100 = 12.

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

Divide the part by the whole and multiply by 100. 18 out of 24 is 18 ÷ 24 × 100 = 75%.

How do I calculate a percentage of marks?

Divide the marks you scored by the total marks and multiply by 100. 425 out of 500 is 85%.

Is anything sent to a server?

No. Everything is calculated in your browser, and nothing you type is stored or sent anywhere.

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