Scientific Calculator
Free online scientific calculator for trig, roots, logs and powers. Type any expression with sin, cos, sqrt or exponents and get an instant accurate result.
About this tool
Need sine, cosine, square roots, or logarithms without digging out a physical calculator? Our free online scientific calculator evaluates full expressions right in your browser - no download, no signup.
Type expressions naturally, like sin(0.5) + sqrt(16) * 2^3, and get an accurate result instantly. It is ideal for homework, engineering estimates, and quick checks.
How to use
Type your expression into the box using standard symbols: + - * / for basic math, ^ for powers, and % for remainder. For functions, write sin(), cos(), tan(), sqrt(), log() for base-10 logarithm, and ln() for the natural logarithm.
Angles for trig functions are in radians. Use parentheses to control the order of operations, then press Calculate. If something cannot be evaluated, you will get a clear error message instead of a wrong answer.
The math behind it
The calculator parses your expression safely: it only allows digits, operators, parentheses, and the named math functions, then evaluates it with the browser's built-in math library. Powers written with ^ are converted to the exponent operator before evaluation.
Trigonometric functions use radians, following the mathematical standard. To convert degrees to radians yourself, multiply degrees by pi and divide by 180 - for example, sin(30 * 3.14159 / 180).