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Calculateur de pourcentage

Calculez instantanément des pourcentages, des variations et des pourcentages inverses.

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Work out what percentage one number is of another, find a percentage of a value, measure percentage increase or decrease, or recover the original value from a result. Everything updates as you type.

Comment ça marche

Pick the question you want to answer and fill in the two numbers.

  • X% of Y multiplies Y by X ÷ 100.
  • X is what % of Y divides X by Y and multiplies by 100.
  • Percentage change uses (new − old) ÷ |old| × 100.
  • Reverse percentage finds the original value: result ÷ (1 ± X ÷ 100).

Exemples

  • 15% of 240 = 36
  • 45 is 18% of 250
  • From 80 to 100 is a +25% change
  • A price of 120 after a 20% discount was originally 150

Questions fréquentes

How do I calculate a percentage of a number?

Multiply the number by the percentage and divide by 100. For example 15% of 240 is 240 × 15 ÷ 100 = 36.

How is percentage change calculated?

Subtract the old value from the new value, divide by the old value, then multiply by 100. A positive result is an increase and a negative result is a decrease.

Why can't I calculate change from zero?

Percentage change divides by the starting value, so a starting value of zero has no defined percentage change.

Guides

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