Math evaluator

A math evaluator calculates the result of a whole expression typed as text, instead of pressing calculator buttons one step at a time. You can write (3 + 4) * 2 ^ 3 / sqrt(16) exactly as you would on paper and get the answer instantly. It is handy for quick engineering checks, unit conversions, spreadsheet-style formulas and verifying results from code.

How to use it

1. Type or paste an expression.
2. Read the result, which updates as you type.
3. Fix any syntax error shown, such as a missing parenthesis.

Supported syntax

• Operators: +, -, *, /, ^ (power) and % (modulo).
• Functions: sqrt, abs, round, floor, ceil, log, exp, sin, cos, tan and more.
• Constants: pi and e.

Worked examples

• 2 + 3 * 4 = 14, because multiplication is done before addition.
• (2 + 3) * 4 = 20.
• sqrt(3^2 + 4^2) = 5, the Pythagorean hypotenuse.
• 1000 * (1 + 0.05)^10 = 1628.89, ten years of 5% compound growth.

Common pitfalls

• Angles are in radians. sin(90) is not 1; use sin(pi / 2) or convert degrees with * pi / 180.
• Power associativity: 2 ^ 3 ^ 2 is evaluated as 2 ^ 9 = 512, not 64.
• log base: in many math libraries log is the natural logarithm. Use log10 or log(x, 10) for base 10 if supported.
• Floating point: 0.1 + 0.2 may show 0.30000000000000004, a normal effect of binary floating-point numbers.

Expressions are evaluated locally in your browser.