Math Expression Calculator
Evaluate scientific math expressions with trig, logs, exponents, factorials, constants and variables.
Math Expression Calculator — A scientific expression calculator that parses and evaluates whatever you type, from a quick 2+2 to nested trigonometry, logarithms, exponents, factorials, and unit-aware arithmetic. It supports constants like pi and e plus variable assignments inside the expression, and every keystroke is re-evaluated automatically. The math engine loads on demand and runs entirely in your browser, so your expressions never leave your device.
What is Math Expression Calculator?
The Math Expression Calculator is a free in-browser tool that turns a typed math expression into a single result. It is built on a full expression parser, so instead of clicking calculator buttons you simply write the formula: sin(pi/4), log(1000, 10), 5!, 2^10, or sqrt(3^2 + 4^2). Students, engineers, data analysts, and developers reach for it when a basic calculator is too limited but a spreadsheet is overkill. Type the expression in the input area, read the answer in the read-only result field, and copy it with one click. The result updates on its own as you edit, and if something is malformed the tool shows the parser's own error message instead of a wrong number.
How to use Math Expression Calculator
- Type a math expression in the input area, for example sqrt(3^2 + 4^2) or sin(pi/4).
- Use functions and operators freely: + - * / ^, sqrt, sin/cos/tan, log/log10, exp, abs, and factorial with the ! suffix.
- Reference constants such as pi and e, or assign variables inline like x = 5; x^2 to reuse a value.
- Read the computed answer in the read-only result field; it recalculates automatically as you edit.
- Click Copy to put the result on your clipboard, or fix the highlighted error message if the expression is invalid.
Examples
Pythagorean hypotenuse
Input
sqrt(3^2 + 4^2)
Output
5
Trigonometry with a constant
Input
sin(pi/6)
Output
0.5
Factorial
Input
10!
Output
3628800
Frequently asked questions
- What can the expression include?
- Arithmetic operators (+ - * / ^), parentheses, functions such as sqrt, sin, cos, tan, log, log10, exp and abs, factorials with the ! suffix, constants like pi and e, and inline variable assignments such as x = 5; x^2.
- Are trigonometric functions in radians or degrees?
- Functions like sin, cos and tan work in radians by default. You can convert degrees with an expression such as sin(45 deg) or sin(45 * pi / 180).
- What happens if my expression has a typo?
- The result field shows a dash until the expression is valid, and the error box displays the parser's exact message so you can see what went wrong.
- Does it round results?
- Numeric results are trimmed to a sensible precision to remove floating-point noise, while large numbers and non-numeric results (like matrices or units) are shown as the engine returns them.
- Is my data sent to a server?
- No. The math engine is loaded on demand and runs 100% client-side in your browser, so your expressions and results never leave your device and nothing is uploaded.
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