How to use the Percentage Calculator
- 1Pick the question you want to answer.
- 2Enter the values.
- 3Read the result instantly.
Supported formats and limits
- Mode 1: X% of Y.
- Mode 2: X is what percent of Y.
- Mode 3: percentage change from one value to another.
- Results update as you type; invalid inputs show a message instead of a number.
Common uses
- Working out a tip.
- Checking a pay rise in percent.
- Comparing prices before and after a change.
Frequently asked questions
How is percentage change calculated?
(new − old) ÷ |old| × 100. A positive result is an increase, negative a decrease.