Percentage Calculator
Math & EverydaySolve percentage of, percentage change and reverse percentages.
Runs entirely in your browser — nothing is uploaded
Features
- Four modes: X% of Y, X is what % of Y, percentage change, and reverse percentage.
- Shows the working, not just the answer.
- Handles increases and decreases with the correct sign.
- Rounding control for clean results.
How to use the Percentage Calculator
- 1Choose the type of percentage question.
- 2Fill in the two known numbers.
- 3Read the answer along with the formula used.
Frequently asked questions
Why is a 50% rise then a 50% fall not break-even?
The fall applies to the larger number. 100 → 150 → 75. To undo a 50% rise you need a 33.3% fall.