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Expression Evaluator
Define variables and evaluate maths formulas with powers, roots and brackets.
Evaluate an expression
Result: —
Variables in use: —
How to use the Expression Evaluator
- Enter one assignment per line in the variables box, such as a = 3.
- Type the formula you want to evaluate in the expression box.
- Press Evaluate and copy the answer with the Copy result button.
Features
- Unlimited named variables with expressions on the right
- Powers, remainders, brackets and constants such as pi
- Clear error messages for unknown names
- Runs locally, no uploads
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Frequently Asked Questions
Common questions about the free online expression evaluator.
Write one assignment per line such as a = 3, type your formula below using those names, and
the result updates as you type.
Yes. Define a first and then b = a * 2 on the next line. Each line can use any variable
defined above it.
Addition, subtraction, multiplication, division, the caret for powers, the percent sign for
remainders and round brackets.
sqrt, cbrt, abs, ln, log, log2, exp, round, floor, ceil, sin, cos and tan, plus the constants
pi, e and tau.
Implicit multiplication is not supported. Write 2 * a with an explicit asterisk between the
number and the variable name.
The tool reports the unknown variable or function in the note under the result instead of
returning a wrong answer.
No. The whole evaluator runs locally in your browser, so your formulas and values never leave
your device.
Yes. The evaluator is responsive and works in any modern browser on desktop, tablet and
phone.
Last updated: October 10, 2026