A powerful math expression evaluator that safely parses and calculates complex expressions. Supports arithmetic operators, exponents, parentheses, and mathematical functions like sqrt, sin, cos, log, and more.
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Type a math expression into the input field and see the result calculated instantly as you type. Supported operators: + (add), - (subtract), * (multiply), / (divide), ^ or ** (power), % (modulo). Supported functions: sqrt(x), sin(x), cos(x), tan(x), abs(x), log(x) (natural log), log2(x), log10(x), ceil(x), floor(x), round(x), min(a,b), max(a,b). Available constants: PI (3.14159...) and E (2.71828...). Use parentheses for grouping: 2 * (3 + 4) = 14. Examples: 'sqrt(144) + 2^3' = 20, 'sin(PI/2)' = 1, 'log10(1000)' = 3. The calculation history saves your last 20 expressions for easy reference.
A math expression evaluator is useful for developers who need quick calculations during coding (e.g., hex conversions, bit calculations, pixel-to-rem conversions), scientists and engineers performing calculations with mathematical functions, students solving homework problems and verifying answers, data analysts computing statistical formulas, financial professionals calculating compound interest and growth rates, anyone who needs a calculator more powerful than the basic system calculator but doesn't want to open a spreadsheet, and developers testing mathematical logic before implementing it in code.
This evaluator uses a safe recursive-descent parser that tokenizes the input into numbers, operators, functions, and parentheses, then evaluates the expression tree following standard mathematical operator precedence (PEMDAS): Parentheses → Exponents → Multiplication/Division → Addition/Subtraction. Unlike eval()-based calculators, this approach is completely safe from code injection as it only processes mathematical tokens. Trigonometric functions use radians (not degrees). The parser handles unary minus (-5), and nested function calls (sqrt(abs(-144))). Results use JavaScript's IEEE 754 double-precision floating-point arithmetic, providing approximately 15-17 significant decimal digits of precision.
No. This calculator uses a safe recursive-descent parser that tokenizes and evaluates expressions without ever calling eval() or Function(). This means it's completely safe from code injection - only mathematical operations are possible. The parser handles operator precedence, parentheses, functions, and constants through a structured evaluation algorithm.
Trigonometric functions (sin, cos, tan) use radians, which is the JavaScript Math standard. To use degrees, convert with the formula: radians = degrees × PI / 180. For example, sin(90°) would be sin(90 * PI / 180) = sin(PI/2) = 1.
Calculations use JavaScript's 64-bit floating-point arithmetic (IEEE 754), providing about 15-17 significant decimal digits. This means very small rounding errors can occur with decimal fractions (e.g., 0.1 + 0.2 = 0.30000000000000004). For most practical purposes, results are displayed with appropriate rounding.
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