Math Expression Evaluator
Online math expression evaluator supporting arithmetic, Math.xxx() method calls, and built-in shorthand for trigonometric, logarithmic, and absolute-value functions, plus the pi and e constants.
FreeOnline Tool
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How to Use
- Type a math expression into the input box, such as 2+3*4, Math.sqrt(16), or sin(pi/2).
- Click Calculate or press Enter and the result appears in the output area.
- If the expression is invalid or the result is not a finite number, an error message is shown.
- Click Load sample data to see a combined expression evaluated instantly.
Features
- Supports the standard arithmetic operators
+ - * / ( )with correct operator precedence. - Supports calling any JavaScript Math method in
Math.xxx()form, such as Math.sqrt(), Math.pow(), and Math.PI. - Built-in shorthand for common functions: sin/cos/tan/asin/acos/atan (trigonometry), log/log10 (logarithms), sqrt (square root), abs (absolute value), and ceil/floor/round (rounding).
- Built-in constant shorthand: pi and e, usable directly without the Math. prefix.
- Invalid expressions or non-finite results produce a clear error message instead of breaking the page.
Use Cases
Double-checking mental arithmetic
Enter a complicated arithmetic or function expression to confirm whether your hand calculation is right.
Quick trigonometry and logarithm lookups
Skip opening a calculator app and type sin(pi/2) or log(e) to get an exact answer straight away.
Checking formulas in engineering or teaching
Verify intermediate steps involving square roots, powers, and absolute values while teaching or doing rough engineering math.
Quick evaluation while coding
Check the value of a math expression on the spot without switching to your IDE or the browser console.
FAQ
Which operators and functions are supported?
The arithmetic operators + - * / and parentheses; any JavaScript Math method through Math.xxx(); and the built-in shorthand functions sin, cos, tan, asin, acos, atan, log, log10, sqrt, abs, ceil, floor, and round, plus the pi and e constants, none of which need the Math. prefix.
Why does my expression show an invalid expression error?
The syntax may be wrong (unbalanced parentheses, for instance), you may have used an unsupported function name, or the result may not be a finite number, such as dividing by zero to get Infinity. Check the spelling and syntax of the expression.
Do sin and cos take degrees or radians?
Radians, matching JavaScript's native Math.sin() and friends. To work in degrees, convert first, for example 90 degrees is pi/2.
Is the calculation done locally, and is it private?
Yes. Expressions are evaluated entirely in your browser and nothing is sent to a server, so any numbers are safe to enter.