Percentage Calculator
AvailableWork out a percentage of a number, what percent one number is of another, or a percent change.
Use the calculator
The numbers below are examples. Replace them with yours. Everything is worked out in your browser.
About this calculator
Percentages show up in discounts, tax, grades and price changes. This calculator does the three jobs people need most: finding a percentage of a number, finding what percent one number is of another, and finding the percent change between two values.
How it works
- X percent of Y is X divided by 100, times Y.
- X as a percent of Y is X divided by Y, times 100.
- Percent change is (Y minus X) divided by the size of X, times 100. A rise from 80 to 100 is 25%, and a fall from 100 to 80 is -20%.
Common questions
Why is a 25% rise not undone by a 25% fall?
Because the second percentage is taken from a larger number. A rise from 80 to 100 is 25%, but the fall back from 100 to 80 is 20%.
Can I calculate a percent change from zero?
No. A change from zero is not defined as a percent because it would mean dividing by zero. The calculator tells you when that happens.
Estimates only. Check important numbers before you rely on them.
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