Percentage Calculator
Five percentage calculations in one — what is X% of Y, X is what % of Y, % change, add Y% to X, subtract Y% from X. Live results.
What powers the Percentage Calculator
5 calculation modes in one tool
Live result as you type
Decimal precision
"%" unit shown where applicable
Mobile-friendly
Why the Percentage Calculator is different
Browser-native
The Percentage Calculator runs entirely in your browser. Input is processed locally — never uploaded, never logged, never cached anywhere outside your device.
No artificial limits
No daily quotas, no character ceilings, no "upgrade for more" walls. Every feature is the complete feature — the same on the first use as the thousandth.
Production-grade quality
Built to the same engineering bar as paid SaaS tools — accurate algorithms, audited logic, responsive design and accessibility-tested interactions.
Common use contexts
- Discount and markup math
- Tip calculation
- Tax calculation
- Grade and test scoring
- Statistical percent change
Private and secure
Zero upload
All processing happens in your browser. Input is never transmitted, logged or cached.
Works offline
Once the page loads, the tool runs without an internet connection. No network calls happen during use.
No tracking
No accounts, no cookies for tool state. Only aggregate analytics count visits at the page level.