How it works
Type or tap an expression
Use the keypad for functions like sin, log, and √, or type directly.
Combine functions freely
Nest parentheses, chain operators, and use constants like pi and e.
Press equals
Press = or Enter to evaluate the full expression at once.
Fix and retry
Invalid expressions show a clear error instead of a wrong answer.
Scientific Calculator evaluates full math expressions — trigonometric functions, logarithms, exponents, roots, and constants — in one pass, rather than requiring you to press an operator between every step. Type an expression like sin(pi/2) + 2^3 directly, or build it up using the keypad, then press equals to evaluate.
Expressions are parsed and evaluated by a dedicated math expression engine rather than JavaScript's own eval(), so the input field never has a path to arbitrary code execution — a malformed or adversarial expression simply fails to parse and shows an error.
This "parse the whole thing, then evaluate" model is the key difference from the Basic Calculator on this site, which folds each keypress into a running total left-to-right with no concept of operator precedence. Because this calculator builds a proper syntax tree first, standard mathematical precedence applies as expected — 2 + 3 × 4 correctly evaluates to 14, not 20 — and parentheses nest arbitrarily deep, so an expression like sqrt((3^2 + 4^2)) resolves the inner exponents and addition before the square root is applied, exactly as you'd expect from working it out on paper.
Trigonometric functions operate in radians by default, matching standard mathematical convention and most programming languages' math libraries — use the pi constant directly in an expression (sin(pi/2)) rather than converting degrees yourself. Logarithms distinguish natural log (log) from base-10 (log10), a common source of confusion carried over from calculators that overload a single "log" button, so this tool keeps the two explicitly separate rather than requiring a mode toggle.
Because parsing and evaluation both happen synchronously in your browser, there's no network round trip between pressing equals and seeing a result — even a long, deeply nested expression evaluates instantly. And since nothing about the expression ever leaves your device, this tool is safe to use for anything you'd rather not paste into a public web-based calculator, from unreleased pricing formulas to homework you're checking before it's graded.