Scientific Calculator
Trigonometry, logarithms, powers and roots, with full expression and memory support. Keyboard input works too.
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Using this calculator
Type an expression using the keypad or your keyboard, then press = or Enter. Unclosed parentheses are automatically balanced. Trig functions use whichever mode — DEG or RAD — is selected above. Press 2nd to switch sin/cos/tan to their inverse functions (sin⁻¹, cos⁻¹, tan⁻¹).
Yes — digits, + - * / ^ ( ) and the decimal point all work directly, plus Enter to evaluate, Backspace to delete, and Escape to clear.
No. Expressions are parsed with a small hand-written parser that only understands numbers, operators and a fixed list of math functions — there's no JavaScript code execution involved.