Percentage Calculator
Calculate percentages three ways: find a percent of a number, work out what percent one number is of another, and measure the percentage increase or decrease between two values — all instantly and privately in your browser.
About the Percentage Calculator
Calculate percentages three ways: find a percent of a number, work out what percent one number is of another, and measure the percentage increase or decrease between two values — all instantly and privately in your browser. It is completely free to use and works on any device — desktop, tablet or mobile — with no installation required.
Key features
- Three modes: percent of a number, percent share, and percentage change
- Instant results — no waiting
- Runs locally, no sign-up or upload required
How to use
- Choose a mode: percent of a number, what percent, or change.
- Enter your numbers — the result appears instantly.
- Copy the answer with one click.
Frequently Asked Questions
How do I calculate what percent one number is of another?
Divide the part by the whole and multiply by 100. Choose the 'what percent' mode, enter both numbers, and the tool does it instantly.
How do I calculate percentage increase or decrease?
Subtract the original value from the new value, divide by the original, and multiply by 100. Use the 'percentage change' mode and enter both values.
Is my data uploaded anywhere?
No. All calculations run locally in your browser, so your numbers never leave your device.