About the Percentage Calculator
Five everyday percentage questions in one calculator: find a percentage of a number, express one number as a percentage of another, measure the percentage change between two values, and add or subtract a percentage. The formula used is shown so you can check the math.
How to use it
- Pick the type of calculation.
- Enter X and Y.
- Read the result, which updates as you type.
Good to know
- Percentage change from zero is undefined and reported as an error.
- Percentage change uses the absolute value of the starting number, so changes from negative values are measured correctly.