The three percentage questions everyone needs, in one tool: a percent of a number, what percent one number is of another, and the percent change between two values.
How it works
- Select the percentage formula you need (e.g., "What is A% of B?").
- Enter the numerical values for A and B.
- The calculator instantly applies the selected percent formula.
Frequently asked questions
Percent change vs percentage points?
Going from 10% to 15% is a 5 percentage-point rise but a 50% relative increase. This tool computes the relative change.
Why is change from zero undefined?
Division by zero — there is no baseline to compare against.
Can A or B be negative?
Yes; the math holds. Percent change uses the absolute value of the starting number as its base.