Math Evaluator
MathEvaluate math expressions safely without eval, supporting functions, operators and parentheses for quick calculations and formula prototyping.
5About Math Evaluator
When you need to evaluate a long expression with parentheses, square roots, and trig functions, the system calculator is slow to click through, and many online calculators pass input straight to JavaScript eval, risking code injection. This tool uses whitelist parsing: it allows only numbers, basic operators, parentheses, and named functions like sqrt, pow, sin, and log, mapping them safely to the built-in math library before evaluating, never running arbitrary code. Results appear as you type, with ^ for powers and % for modulo. Everything runs locally in your browser, so your formulas are never uploaded. Tip: Bookmark this tool for quick access whenever you need mathematical calculations. All computation happens locally in your browser with instant results.
How to Use
- Open the Math Evaluator tool page
- Enter or paste your data into the input area
- View the real-time results and use the copy button to get the output
Use Cases
- Compound formulas — Evaluate nested expressions like (2+3)*4/sqrt(16) in one go, no manual steps.
- Scientific math — Call sin, cos, log, and exp for engineering or physics estimates.
- Power operations — Use pow(2,10) or 2^10 to size storage or growth multipliers fast.
- Quick checks — Verify a formula result while coding to avoid a wrong coefficient in logic.
- Modulo tests — Use % to check divisibility when designing loops or pagination.
- Unit conversion — Evaluate expressions like 12*2.54 to convert inches to centimeters inline without switching tools.
- Budget calculations — Compute complex formulas like (salary*0.3)+bonus in one pass to estimate allocations.
FAQ
Does it use eval? Is it safe?
It does not run arbitrary code. A regex first restricts input to numbers, operators, parentheses, and whitelisted functions; illegal characters are rejected before a constrained evaluator runs, neutralizing typical eval injection.
Which functions are supported?
sin, cos, tan, asin, acos, atan, sqrt, log, log2, log10, exp, abs, floor, ceil, round, pow, min, max, plus the constants PI and E.
Do trig functions use degrees or radians?
Radians. For example, sin(PI/2) equals 1. To use degrees, multiply by PI/180 first.
Is ^ different from pow?
No. ^ is converted to exponentiation, so 2^10 and pow(2,10) both yield 1024. Use whichever you prefer.
Why does it say the result is not a finite number?
Dividing by zero gives infinity, while sqrt of a negative or log of a non-positive gives NaN. Such non-finite results are flagged so you can fix the expression.
Any browser compatibility requirements?
This tool works in all modern browsers (Chrome, Firefox, Edge, Safari). No plugins or extensions required.
Can I use it offline?
After initial load, most features work offline. The core logic runs entirely in your browser with no network dependency.
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