A full-featured scientific calculator that handles both basic arithmetic and advanced math functions. Evaluate expressions with sine, cosine, tangent, logarithms, square roots, powers, and mathematical constants. Type expressions directly or use the button grid. Everything runs in your browser with a safe expression parser.
Enter your values to see the result.
2 + 3 * 4 → 14
Standard operator precedence applies — multiplication before addition.
sqrt(144) → 12
Square root of 144 is 12.
sin(pi / 2) → 1
Sine of 90 degrees (pi/2 radians) equals 1.
Everyday calculators handle addition and subtraction, but science, engineering, and programming often require trigonometric functions, logarithms, and powers. Online scientific calculators either bombard you with ads or require downloads. This tool provides a clean, fast, ad-light interface that works instantly in your browser.
Addition (+), subtraction (-), multiplication (*), division (/), and power (^) all work with standard mathematical precedence. Parentheses allow you to override the default order of operations.
sin(x) — Sine of x radians. Returns a value between -1 and 1.
cos(x) — Cosine of x radians. Also returns a value between -1 and 1.
tan(x) — Tangent of x radians. Returns sin(x)/cos(x).
All trigonometric functions use radians. To work in degrees, convert first: multiply by pi/180.
log(x) — Base-10 logarithm. For example, log(1000) = 3.
ln(x) — Natural logarithm (base e). For example, ln(e) = 1.
sqrt(x) — Square root. For example, sqrt(49) = 7.
abs(x) — Absolute value. For example, abs(-5) = 5.
pi — The mathematical constant π ≈ 3.14159265.
e — Euler's number e ≈ 2.71828183.
Unlike many online calculators that use eval() (a security risk), this tool implements a custom recursive descent parser. The parser works in two stages:
Tokenization — The input string is broken into tokens: numbers, operators, function names, constants, and parentheses. Any unrecognized character causes an error.
Parsing — The tokens are processed according to mathematical precedence rules using a recursive descent algorithm. Each precedence level has its own parsing function: expressions handle + and -, terms handle * and /, powers handle ^, and primaries handle numbers, constants, functions, and parenthesized sub-expressions.
This approach is completely safe — it can only evaluate mathematical expressions and cannot execute any other code.
Students — Solve homework problems involving trigonometry, logarithms, and exponents without a physical calculator.
Engineers — Quick calculations for signal processing, structural analysis, or control systems.
Programmers — Verify mathematical formulas before implementing them in code.
Scientists — Compute values for equations involving natural logarithms, trigonometric functions, or powers.
All calculations run in your browser using a custom JavaScript parser. No expressions or results are sent to any server. The parser handles expressions instantly, with no external dependencies or network requests.
The calculator supports addition (+), subtraction (-), multiplication (*), division (/), power (^), and parentheses for grouping. Functions include sin, cos, tan, log (base 10), ln (natural log), sqrt, and abs. Constants pi and e are also available.
Trigonometric functions use radians, which is the standard in mathematics and most programming languages. To convert degrees to radians, multiply by pi/180. For example, sin(30 * pi / 180) gives the sine of 30 degrees.
Yes, the calculator uses a custom expression parser built specifically for mathematical operations. It does not use eval() or any similar function that could execute arbitrary code. Only mathematical expressions are accepted.
Standard mathematical precedence applies: parentheses first, then power (^), then unary minus, then multiplication and division (left to right), then addition and subtraction (left to right). Functions like sin() are applied before operators.
No, all calculations happen entirely in your browser using a custom JavaScript expression parser. No expressions, results, or any other data are transmitted to any server, stored in any database, or logged anywhere. The parser runs completely locally on your device and produces results instantly with no external dependencies or network requests of any kind.
Last updated on 2026-09-26 · Written by UtiliaTools