Scientific calculator.
A proper scientific calculator. Type with your keyboard or tap the keys; tap the answer to copy it.
Keyboard: digits and + − × ÷ ^ ( ) !, Enter = equals, Backspace, Esc clears, arrows move the cursor. Type function names too: sin(30), sqrt 16, 5 nCr 2, log2(8), root(27,3). % is modulo (remainder).
How it reads an expression
Standard precedence: brackets, then factorial, then powers (right to left, so 2^3^2 = 512), then nCr/nPr, then the minus sign (so −3² = −9, like a real calculator), then × ÷ and implied multiplication (2π, 2(3), 2sin30), then + −. Trig uses the DEG/RAD switch; the 2ND key turns sin into sin⁻¹, ln into eˣ, and so on. Nothing you type leaves this page.
A free online scientific calculator for school and exams: trigonometry in degrees or radians with inverse functions, natural and base-10 logs, powers and roots, factorial, nCr and nPr, brackets, constants, memory keys, ANS and a history you can tap to reuse. It follows standard operator precedence, types from the keyboard, and runs entirely in your browser, so it works offline and nothing you enter is sent anywhere.