The fastest way to evaluate any math expression

What is an expression calculator?

A mathematical expression is any combination of numbers, operators, parentheses, and functions that can be evaluated to produce a single numerical result. Examples range from simple arithmetic like 3 + 4 * 2 to complex expressions like sqrt(sin(pi/4)^2 + cos(pi/4)^2).

An expression calculator evaluates these expressions correctly — respecting the standard mathematical order of operations — and returns an accurate numerical answer. Unlike a basic four-function calculator, an expression calculator handles exponents, roots, trigonometric functions, logarithms, and nested parentheses in a single calculation.

How it works

ExpressionCalculator.com uses a custom recursive-descent parser — not JavaScript's eval() function. This means:

• Expressions are correctly parsed according to mathematical precedence rules (PEMDAS/BODMAS)
• Each sub-expression is tracked so step-by-step solutions can be shown
• Edge cases like nested parentheses, right-associative exponents, and unary minus are handled accurately
• The calculator is safe — no arbitrary code can be executed through the input field

Supported operations

Syntax	Operation	Example
+ − * /	Arithmetic	12 * 3 + 4 / 2
^	Exponent	2^10 = 1024
( )	Grouping	(2+3)*(4-1)
sqrt( )	Square root	sqrt(144) = 12
sin( ) cos( ) tan( )	Trigonometry (radians)	sin(pi/2) = 1
log( )	Logarithm base 10	log(1000) = 3
ln( )	Natural logarithm	ln(e) = 1
abs( )	Absolute value	abs(-7) = 7
pi   e	Constants	2 * pi * 5
n!	Factorial	6! = 720
%	Percent	200 * 15% = 30

Who is it for?

ExpressionCalculator.com is built for anyone who needs fast, accurate arithmetic - including students learning PEMDAS and checking homework, teachers generating examples quickly, developers testing numerical logic and professionals doing quick calculations.

Our commitment

ExpressionCalculator.com will always be free and focused on doing one thing exceptionally well: evaluating mathematical expressions accurately and clearly. We will not add paywalls, require logins or introduce features that get in the way of the core calculation experience.