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Percentage Calculator

Work out percentages three ways: a percent of a number, what percent one number is of another, and percentage increase or decrease.

What is X% of Y?

30

15% of 200

X is what percent of Y?

15%

30 out of 200

Percentage increase or decrease

+25%

Increase from 200 to 250

How to use the Percentage Calculator

  1. Pick the question. Three calculators cover the three things people mean by percentage.
  2. Fill in the numbers. Answers update as you type, with the working shown underneath.

Frequently asked questions

What is the difference between percentage points and percent?
Going from 10 percent to 12 percent is a rise of two percentage points, but a 20 percent increase. Confusing the two is one of the most common errors in reporting figures.
Why is a 50 percent rise not cancelled by a 50 percent fall?
Because each is applied to a different base. One hundred rises by half to 150, and half of 150 is 75, not 100. Percentage changes compound rather than simply adding up.
How do I calculate a percentage decrease?
Subtract the new value from the old one, divide by the old value, then multiply by 100. A negative result from the change calculator here means the value went down.
How do I remove a percentage that was already added?
Divide rather than subtract. To strip 20 percent tax from a gross figure, divide by 1.2. Subtracting 20 percent of the gross gives a different and incorrect answer.

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