Percentage Calculator — free online tool
You're at the shop, the sign says 30% off, and your head goes blank trying to figure out the new price. Or a friend asks how much a tip should be and you reach for your phone. Numbers like these come up all the time, and doing them in your head is fiddly. We added a free tool that does it for you — Percentage Calculator — right in your browser.
What it does
It finds a percentage of a number, works out the percent change between two values, and handles a few other everyday percent questions. You type the numbers and the answer appears as you go — no button to press, no waiting. Simple, quick, and always live.
Nothing leaves your device
The whole thing runs in your browser. The numbers you type stay on your screen and are never uploaded or saved anywhere. Nothing is sent to a server, so you can use it for anything, even private figures, without a second thought.
How to use it
- Open Percentage Calculator and pick the kind of calculation you need.
- Type your numbers into the boxes.
- Read the answer right away — it updates as you type, ready to copy down.
It's free with no limit. There are more small tools on the Apps page.