Online Calculator

Tap the keys or type an expression, then press = or Enter.

Your text and files never leave your browser — nothing is sent to a server.

How to use

Multiplication and division come before addition and subtraction, and brackets come first of all. Implied multiplication such as 2π or 3(4+1) is understood.
A live preview of the answer shows while you type. Press = or Enter to lock in the result.
A percent after plus or minus works like a shop calculator: 50+10% gives 55. Anywhere else, % simply divides by 100.
Turn on “Show scientific keys” for sin, cos, tan, log, ln, square roots, powers and factorials. The DEG/RAD key switches the angle unit.
Tap any line in History to keep calculating from that result. History disappears when you close the page.

Does 0.1 + 0.2 really show 0.3?

Yes. Results are rounded to 12 significant digits, which hides the tiny binary rounding error computers make with decimals.

Can I use my keyboard?

Yes. Type digits and + − * / ^ % ( ) directly. Enter calculates, Backspace deletes one character and Esc clears everything.

Is my calculation history saved anywhere?

No. It only lives in the open page and is never stored or sent anywhere.