Scientific Calculator

Free online scientific calculator with trigonometry, logarithms, powers, and roots. Real expression evaluation with proper operator precedence, not just basic arithmetic.

Browser only -- real expression parser with correct operator precedence.

How to Use This Tool

Type a math expressionFunctions, operators, and parentheses all supported

See the result instantlyCorrect operator precedence applied automatically

Use the function buttonsQuick insert for common functions

Scientific Calculator is a free online tool that works entirely in your browser — no signup, no data uploaded, no limits.

A Real Parser, Respecting Mathematical Precedence

Evaluating "2 + 3 * 4" naively left-to-right gives 20, which is wrong -- the correct mathematical answer is 14, since multiplication binds tighter than addition. This calculator builds a proper expression tree respecting standard precedence rules (exponents, then multiplication/division, then addition/subtraction), the same logic any correct calculator or programming language interpreter applies.

Functions Beyond Basic Arithmetic

Trigonometric functions (in radians, the standard mathematical convention), natural and base-10 logarithms, square roots, and exponentiation round out the function set, covering what a genuine scientific calculator needs beyond the four basic operations.

Parentheses for Explicit Control

Wherever the default precedence doesn't match what you intend, parentheses let you group expressions explicitly -- fully supported with proper nesting, evaluated according to standard mathematical grouping rules.

Frequently Asked Questions

It parses your input into a structured expression tree respecting standard mathematical precedence -- exponents before multiplication/division, which come before addition/subtraction -- rather than evaluating left to right naively, which would produce wrong results for any expression mixing operation types.

Yes, sin, cos, and tan are supported, calculated in radians by default since that's the standard mathematical convention -- convert degree inputs to radians (multiply by π/180) if you're working in degrees.

Natural log (ln), base-10 log, square root, and exponentiation (using ^) are all supported, covering the common scientific calculator function set beyond basic arithmetic.

Nested parentheses are fully supported and evaluated according to standard mathematical grouping rules, letting you control evaluation order explicitly wherever the default precedence isn't what you want.

The calculator shows a clear error rather than silently producing a wrong or misleading result, helping you catch typos or malformed expressions before relying on an incorrect answer.