Calculator
Your files never leave your device
Check your Network tab and see
Work starts the moment you drop a file
No daily limit, no sign-up, no watermark
The result is value × percent ÷ 100 — for example 15% of 240. It is the building block for tips, discounts, tax, and interest before those add their own extra rules.
Entering more than 100% is valid and simply returns more than the original number, which is what you want for markups or growth greater than the base.
That is the promise behind every tool here. Files are read in your browser tab, processed there, and discarded when you close it — never uploaded to our servers.
