Math Evaluator

What is Math Evaluator?

Math Evaluator parses and computes mathematical expressions written in standard infix notation, supporting arithmetic operators, exponentiation, parentheses, and common math functions like sin, cos, log, sqrt, abs, and floor. It uses arbitrary-precision arithmetic to avoid floating-point rounding errors common in IEEE 754, correctly evaluating expressions like 0.1 + 0.2 as exactly 0.3. The tool supports variable assignment for multi-step calculations and displays intermediate results.

Students verifying homework calculations, engineers checking formulas in specifications, and developers testing arithmetic logic before coding. The tool runs entirely in your browser — your data never leaves your device.

How to Use Math Evaluator

1. Type a mathematical expression using standard operators (+, -, *, /, ^, %) and parentheses
2. Use built-in functions like sqrt(), sin(), cos(), log(), abs(), ceil(), floor()
3. Assign variables with = to reuse values in subsequent expressions
4. Review the result with full precision and copy it to clipboard

Common Use Cases

• Computing complex nested expressions that are error-prone on a basic calculator
• Verifying hand-calculated math in engineering specifications or financial models
• Evaluating formulas with trigonometric and logarithmic functions for physics homework
• Testing arithmetic expressions before embedding them in code to catch logic errors

Pro Tips

• The evaluator respects operator precedence (PEMDAS) but use parentheses for clarity — 2^3^2 is right-associative (2^9 = 512), not left-associative (8^2 = 64), which surprises most people
• Use the modulo operator (%) for remainder calculations — it follows the sign of the dividend, so -7 % 3 = -1, matching C and JavaScript behavior rather than Python's always-positive modulo
• For financial calculations, use exact decimal mode to avoid IEEE 754 artifacts — 0.1 + 0.2 = 0.30000000000000004 in floating point but exactly 0.3 in decimal mode

Why Use This Tool?

• Privacy-first: All processing happens locally in your browser. No data is transmitted to any server.
• No installation required: Works in any modern browser on desktop or mobile.
• Completely free: No account, no credit card, no usage caps.
• Fast and reliable: Powered by modern Web APIs for near-instant results.

Related Concepts

Learn more about related topics: Expression parser, Arbitrary precision, Infix notation, PEMDAS.

Frequently Asked Questions