Percentage Calculator — Free Online Tool
Use Percentage Calculator free online — runs entirely in your browser, no data sent to servers. No sign-up required.
Calculation Mode
Input Values
How it works
- X% of Y: multiply Y by X divided by 100
- X is what % of Y: divide X by Y and multiply by 100
- % change: ((new − old) / |old|) × 100; negative means a decrease
Frequently Asked Questions about Percentage Calculator
- Is Percentage Calculator completely free to use?
- Yes, Percentage Calculator is 100% free with no sign-up, no watermarks, and no usage limits.
- Is my data private?
- Percentage Calculator runs entirely in your browser — no data is ever sent to our servers. Your content stays on your device.
- Does it work offline?
- Once the page has loaded, Percentage Calculator works fully offline in your browser — no internet connection is required.
- How accurate are the results?
- All calculations use standard, well-established formulas and are accurate to at least 4 decimal places. Results are for guidance.
- Does Percentage Calculator work on mobile and tablet?
- Yes, Percentage Calculator is fully responsive and works in all modern browsers on desktop, tablet, and mobile.
This tool runs entirely in your browser. No data is ever sent to our servers.