Percentage Calculator
Work out what X% of Y is, what percentage one number is of another, or the percentage change between two numbers. Calculated instantly in your browser.
- Runs entirely in your browser
- No sign-up, no watermark
- Free and unlimited
🔒 Your file stays on your device
How to use Percentage Calculator
- 1
Open Percentage Calculator and fill in the fields.
- 2
Pick any options that apply.
- 3
Read the result straight away — it recalculates as you type.
What you get
- Three modes in one tool
- Handles negatives and decimals
- Instant, no sign-up
What happens to your files
This tool runs entirely in your browser. The file you choose is read into memory, processed on your device, and offered back as a download. Nothing is uploaded and nothing is kept once you leave the page.
There is no account, no email, no watermark and no daily limit. Come back whenever you need it.
Frequently asked questions
- How is percentage change calculated?
- As (new − old) ÷ |old| × 100. A move from 50 to 75 is +50%; from 50 to 25 is −50%.