Calculators
Percentage Calculator
Calculate X% of Y, what percent one number is of another, or percent change.
Runs in your browser Your input never leaves your device.
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About this tool
Choose one of three calculations and enter two numbers. X% of Y finds a part, for example 15% of 200. X is what % of Y finds the share one number is of another. % change from X to Y finds how much a value rose or fell relative to the starting number X, and a negative result means a decrease. Results update as you type and are rounded to four decimal places. Some inputs give no result: X is what % of Y needs Y not to be 0, and percent change needs X not to be 0. All math runs in your browser.
How to use it
- Select the calculation type.
- Enter the number X.
- Enter the number Y.
- Read the result below, which updates as you type.
Example
For the X% of Y mode, 15% of 200 gives 30.
Input
% change from X to Y: X = 80, Y = 100
Result
25%
Common problems
- No result is shown
- Dividing by zero is not allowed. Y cannot be 0 for the what-percent mode and X cannot be 0 for percent change.
- Percent change looks wrong after a decrease
- A drop shows as a negative percentage, for example 100 to 80 is -20%.
- Result is rounded
- Values are rounded to four decimal places.