1. 01Choose DEG or RAD.
2. 02Enter an expression with the keyboard or the on-page buttons, for example sin(30)+sqrt(16).
3. 03Press Enter or = to calculate; the result becomes the new Ans.
4. 04The history on the right keeps up to 50 entries; click one to fill it back in, or clear them all in one click.

Supported syntax

— + - * × / ÷ % ^ !, parentheses and the listed functions; an unknown function or character raises an error.

Errors

— a divisor or remainder base of 0 raises an error, and so do functions outside their domain and results that are not finite.

Factorials

— non-negative integers only, up to 170!; anything larger exceeds the range the implementation allows.

Precision

— displayed results are rounded to about 15 significant digits, and a result whose absolute value is below 1e-15 is shown as 0, so this is not an arbitrary-precision calculator.

What it does not do

— no variable definitions, matrices, complex numbers or symbolic derivation, and it never executes JavaScript code.

Expressions are calculated locally in the browser; the history is written only to this browser's local storage and is not uploaded to a server.