Percentage Calculator
Percent of a value, change, discount and reverse.
Ctrl+Enter runs. Ctrl+Shift+Backspace clears.
Export and import are available after you sign in. Sign in
Find a percent of a number, what share one value is of another, the change between two numbers, and the original price before a discount or markup.
About this tool
Four everyday percentage questions in one place: how much is 20% of 150, what share 30 is of 120, how much a price changed in percent, and what the original price was before a discount.
How to use it
- 01
Choose the operation, for example "X% of Y" or "percent change".
- 02
Enter the two numbers X and Y.
- 03
Read the result, which updates as you type.
Frequently asked questions
How do I calculate a percentage change?
Pick the change operation and enter the old and new values. The tool returns (new − old) / old × 100%.
Can it find the price before a discount?
Yes. Use the reverse operation: enter the discounted price and the percentage to get the original price.