Web Tools
Math Expression Evaluator
Evaluate math expressions safely without eval(). Supports arithmetic, powers, parentheses, trigonometric functions, logarithms, square roots, and constants (pi, e, tau, phi). 10 built-in examples. Runs entirely in your browser — your data never leaves your machine.
math calculator expression evaluator developer-tools
Published May 28, 2026
All interactive tools run entirely in your browser. Your data never leaves your device.
How It Works
Type a math expression and get the result instantly. The evaluator uses a recursive descent parser — no eval() or Function() — so it’s safe by design. It supports standard arithmetic operators, exponentiation, parentheses, built-in functions like sin, sqrt, and log, and constants like pi and e.
Features
- Safe evaluation: recursive descent parser, no eval() or code execution
- Arithmetic:
+,-,*,/,%,^(power) - 18 functions: sin, cos, tan, asin, acos, atan, sqrt, cbrt, abs, log, ln, log2, ceil, floor, round, min, max, pow
- 4 constants: pi, e, tau, phi (golden ratio)
- Operator precedence: standard math order with parentheses override
- Right-associative powers:
2^3^2=2^9= 512 - Unary operators:
-xand+x - 10 examples: basic arithmetic to complex expressions
- Reference panel: expandable list of all functions and constants
- Private: runs entirely in the browser — no data transmitted
Use Cases
- Quick calculations without leaving the browser
- Evaluating math formulas with trigonometry
- Converting between logarithmic scales
- Verifying mathematical identities
- Teaching expression parsing concepts