Scientific Calculator — Free Online, With Real Math Rules

How to use

1. Type an expression or tap the keypad — function keys like sin( insert with the bracket ready.
2. Toggle DEG/RAD to match the units you are working in.
3. Press = (or Enter) to evaluate with full precedence handling.
4. Tap any history line to bring that calculation back.

About this tool

Most online calculators are either toy four-function pads or ad-heavy app stores. This one is a genuine scientific calculator that lives entirely in this page: a tokenizer and shunting-yard evaluator give it the same precedence rules you learned in class — powers bind right to left, unary minus sits just below the power operator (so −2^2 is −4), and 2^−3 works the way you'd expect. You get sin/cos/tan plus their inverses, log and ln, √, factorials, π and e, a deg/rad switch, ANS recall and a history of your last three calculations, each tappable to reuse. Results are rounded to 12 significant digits to hide floating-point noise. Nothing you type is sent anywhere — the page has no server to talk to.

FAQ

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