Calculator
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About this tool

This free online calculator handles the everyday arithmetic — add, subtract, multiply, divide, percentages, and sign changes — and you can drive all of it from the keyboard instead of hunting for buttons with the mouse. Nothing is uploaded: every calculation runs locally in your browser, and the history is kept in the page only, so it disappears when you close the tab.

Keyboard shortcuts

How to use

FAQ

Are my calculations sent to a server? No. Everything is computed in your browser and nothing leaves your machine.

Why does a long result get rounded? Results are rounded to 12 significant digits. Computers store decimals in binary, so without that rounding 0.1 + 0.2 would show as 0.30000000000000004 instead of 0.3.

Is there a scientific mode? Not here — this is a plain four-function calculator, kept small and fast on purpose.