Percentage calculator
Percentages, discounts and percentage change
How it works
Calculate percentages, discounts and percentage changes. Change is (new − old) / old × 100 and requires a nonzero original value.
Example
A 25% discount on 100 gives a price of 75.
How to use
- Enter your values or choose a local file.
- Choose settings and run the tool.
- Review the result, then copy it or download the file.
Common questions
What rules does this tool use?
Calculate percentages, discounts and percentage changes. Change is (new − old) / old × 100 and requires a nonzero original value.
Are my inputs uploaded?
Calculations, texts and files are processed in this browser. The currency tool requests only currency codes from our server.
Free tool · Inputs processed locally · Updated October 5, 2026