Tools
Math Calculator
The math evaluator lets you type any mathematical expression and instantly compute its result. It supports standard arithmetic, exponentiation, parentheses, trigonometric and logarithmic functions, constants like pi and e, and variable assignments. It is useful for quick calculations during development, verifying algorithm outputs, and exploring mathematical relationships.
What is the Math Evaluator?
The math evaluator is a browser-based expression parser and calculator that goes beyond a basic four-function calculator. It understands function notation such as sin(), cos(), sqrt(), and log(), mathematical constants like PI and E, and supports defining variables within a session. Expressions are parsed safely without using JavaScript eval, preventing code injection while still supporting a rich expression syntax. Results are displayed with configurable decimal precision.
How does it work?
Type a mathematical expression into the input field and press Enter or click Evaluate. The tool tokenizes the expression, builds an abstract syntax tree, and evaluates it numerically. Function calls, operator precedence, and parentheses are all handled correctly. You can define variables (e.g., x = 5) and reuse them in subsequent expressions. Results are shown immediately with full floating-point precision and, where applicable, formatted for readability.
Typical Use Cases
- Verifying a bit-shifting or modulo calculation during algorithm development
- Computing percentage changes or ratios during data analysis
- Evaluating trigonometric functions for coordinate calculations
- Quickly checking a formula from a technical specification
Step-by-step Guide
- Step 1: Type your mathematical expression into the input field.
- Step 2: Use standard operators (+, -, *, /, ^) and functions (sin, log, sqrt).
- Step 3: Press Enter to evaluate and see the result.
- Step 4: Define variables to reuse in follow-up expressions.
Example
Input
sqrt(2^10 + 3^10)
Output
232.79
Tips & Notes
- Use ** or ^ for exponentiation depending on the supported syntax.
- Angles in trigonometric functions are typically in radians — multiply degrees by PI/180 to convert.
- Chain variable assignments to build up complex formulas step by step.
Frequently Asked Questions
Is it safe to evaluate user-provided expressions?
Yes, this tool uses a purpose-built expression parser rather than JavaScript's eval() function. It only supports mathematical operations and cannot execute arbitrary code.
What is the precision of the results?
Results use JavaScript's 64-bit IEEE 754 double-precision floating point, which provides about 15 significant decimal digits. For exact arbitrary-precision arithmetic, a dedicated library is needed.
Math Calculator
Evaluate mathematical expressions with functions such as sqrt, sin, cos, log, abs, and more — including history and a full function reference.
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