Percentage Calculator
Work out percentages, changes and discounts.
Questions
How do I calculate a percentage of a number?
Multiply the number by the percentage and divide by 100. For example, 15% of 80 is 80 × 15 ÷ 100 = 12.
How is percentage change calculated?
Subtract the old value from the new one, divide by the old value and multiply by 100. Going from 50 to 65 is (65 − 50) ÷ 50 × 100 = a 30% increase. Change from zero can’t be expressed as a percentage.
Why doesn’t a 20% discount followed by a 20% increase give the original price?
Because the second percentage is taken from a smaller number. 100 minus 20% is 80, and 80 plus 20% is 96. To undo a 20% discount you need a 25% increase.
What’s the difference between percent and percentage points?
If an interest rate goes from 4% to 5%, it rose by 1 percentage point, but by 25% in relative terms. Use “Percentage change” with 4 and 5 to see the relative change.
Is it free? Do I need an account?
It is free to use and there is nothing to sign up for. There are no watermarks and no daily limits.
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