Math Expression Evaluator

Evaluate arbitrary math expressions with variables, functions, and operator precedence. Multi-line support.

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1. Type a math expression using standard operators (+, -, *, /, ^, %) and functions (sin, cos, sqrt, etc.). 2. Define variables by typing assignments like x = 5, then use them in expressions. 3. Enter multiple expressions on separate lines to evaluate them all at once. 4. Click Evaluate or press Enter to compute the results. 5. View the result for each line displayed alongside the expression. 6. Click the copy button to copy any result.

About This Tool

The Math Expression Evaluator is a powerful calculator that lets you type math expressions in natural notation and get instant results. Unlike a basic calculator with buttons, you can write full expressions like "sqrt(16) + 3^2" or "sin(pi/4) * 2" and see the answer immediately. It supports all standard arithmetic operators, exponents, roots, trigonometric functions, logarithms, factorials, and much more.

One of the most useful features is variable support. Define a variable on one line - such as "x = 42" - and use it in subsequent expressions. This makes it easy to build up complex calculations step by step, reusing intermediate results without copying numbers manually. Variables persist across evaluations within a session, so you can iterate on your work.

The evaluator accepts multiple expressions at once, one per line, and shows the result for each line individually. Errors are highlighted per line so a typo in one expression does not break the rest. Whether you are a student checking homework, a developer debugging formulas, or anyone who needs a quick calculation, this tool replaces clunky desktop calculators with a clean, keyboard-friendly interface.

Frequently Asked Questions

The evaluator supports standard arithmetic (+, -, *, /, ^), trigonometric functions (sin, cos, tan, asin, acos, atan), logarithms (log, ln, log2, log10), roots (sqrt, nthRoot), factorials (!), absolute value (abs), rounding (round, floor, ceil), and constants (pi, e). It uses the mathjs library so the full range of mathematical functions is available.
Yes. Write an assignment like "x = 10" on one line, and all subsequent lines in the same evaluation can reference x. Variables persist within your session, so you can evaluate new expressions that use previously defined variables.
Enter one expression per line in the text area, then click Evaluate or press Ctrl+Enter. Each line is evaluated independently, and results appear in order. Lines that define variables make those variables available to later lines.
Each line is evaluated separately. If one line contains a syntax error or invalid operation, that specific line shows an error message while all other lines are evaluated normally.
Yes. The evaluator respects standard mathematical operator precedence: parentheses first, then exponents, then multiplication and division, then addition and subtraction. You can use parentheses to override the default order.

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