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Scientific Calculator

Precision arithmetic, trigonometric functions, memory settings & live calculation history.

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Keyboard Guide: Number keys, standard operations (+, -, *, /), parentheses, and decimals are mapped. Press Enter to evaluate, Backspace to delete, and Ctrl+C to copy result.

How the Scientific Calculator Works

This calculator evaluates mathematical expressions using standard operator precedence (PEMDAS/BODMAS): exponents are evaluated first, then multiplication and division left to right, then addition and subtraction. Parentheses override this order, allowing complex nested expressions to be entered.

Formula Used

Expression → Tokenise → Parse (respecting precedence) → Evaluate → Result
Tokenise
— the input string is split into numbers, operators, functions, and parentheses
Parse
— a recursive-descent or shunting-yard algorithm arranges tokens by precedence and associativity
Evaluate
— the resulting expression tree is evaluated; trig functions use the selected angle unit (deg/rad)
Precision
— results are displayed up to 10 significant digits, with trailing zeros trimmed for readability

Example Calculation

To calculate the hypotenuse of a right triangle with legs of length 3 and 4, you can use the Pythagorean theorem directly: enter √(3² + 4²) as √(3^2 + 4^2). The calculator evaluates 3² = 9, 4² = 16, 9 + 16 = 25, then √25 = 5.

Frequently Asked Questions