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Percentage calculator

Four percentage questions in one panel: what a percentage of a number comes to, what percentage one number is of another, the change between two values, and a value with a percentage added or taken off. Pick the question and the two numbers stay where they are.

What do you want to work out?

  • Result

    16

    20% of 80 is 16.

Common questions

  • How do I work out a percentage of a number?

    Multiply the number by the percentage and divide by 100. So 20% of 80 is 80 × 20 ÷ 100, which is 16. The first mode above does exactly that.

  • How do I calculate a percentage increase?

    Subtract the old value from the new one, divide by the old value, then multiply by 100. From 80 to 100 is (100 − 80) ÷ 80 × 100, which is a 25% increase.

  • Why doesn't a 20% fall cancel a 20% rise?

    Because the second percentage applies to a bigger number. 80 plus 20% is 96, and 96 minus 20% is 76.8 rather than 80. Undoing a 20% rise takes a fall of 16.67%.

  • What is the difference between percent and percentage points?

    A rate moving from 20% to 25% has risen five percentage points, but that is a percentage increase of 25%. Interest and unemployment figures are quoted in points to avoid the ambiguity.

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