Developer Calculator — Free Online Tool Online scientific calculator: basic math, trigonometry, logarithms, exponents, roots. Calculation history, variables, expression evaluator.
Use this free online Developer Calculator directly in your browser. No signup required, no data leaves your device. Part of Utilier — a collection of 133+ developer utilities.
What is Scientific Calculator (Online, Functions, Variables, History)? Scientific calculator performs mathematical operations including basic arithmetic (add subtract multiply divide), advanced functions (sin cos tan log sqrt), exponents and roots, parentheses for order, variables for storage, and calculation history for reference.
A scientific calculator evaluates mathematical expressions using operator precedence, parentheses, functions, and constants rather than only one operation at a time. It is useful for validating formulas used in code, estimating values, and exploring trigonometric, logarithmic, or exponential relationships. Angles require special care because trigonometric functions may be interpreted in degrees or radians depending on the chosen mode.
Basic operations: Addition (+), subtraction (-), multiplication (*), division (/), modulo (%), exponents (^).Scientific functions: sin, cos, tan, asin, acos, atan, log, ln, exp, sqrt, cbrt, abs.Constants: pi (3.14159...), e (2.71828...), phi (golden ratio).Expression eval: Evaluate complex expressions: 2 * (3 + 4) ^ 2 = 98. Respects order of operations (PEMDAS).Why use calculator? Quick calculations without installing software. Expression-based input (not button clicks).
Fast: Type expression, get result. Faster than clicking buttons.Complex expressions: Evaluate: sqrt(16) + 2^3 = 12. Nested functions, parentheses supported.History: Previous calculations saved. Review, reuse, reference past results.When to use calculator Use for quick mathematical calculations.
Basic math (quick addition, subtraction). Scientific calculations (trigonometry, logs). Expression evaluation (complex formulas). Unit conversions (with multiplication). Programming math checks (verify algorithm output). How to use calculator Type expression, press Enter for result.
Enter expression: Type: 2 + 2 or sqrt(16) or sin(pi/2). Use keyboard or on-screen buttons.Calculate: Press Enter or = button. Result displayed: 4 or 4 or 1.Use functions: sqrt(number), sin(angle), log(value). Example: sqrt(25) = 5.View history: Past calculations listed. Click to reuse expression.Key features Expression input: Type full expression: 2 * (3 + 4). Evaluates with correct order (PEMDAS).Scientific functions: sin, cos, tan, log, ln, sqrt, exp, abs, ceil, floor, round.Constants: pi, e (Euler's number), phi. Use in expressions: 2 * pi * r.History: Saves calculations. Scroll through previous results.Keyboard input: Type on keyboard (faster than mouse). Supports copy-paste.Common use cases Quick math: Calculate: 1234 * 5678 = 7,006,652. Faster than phone calculator.Trigonometry: Find: sin(45 degrees) = sin(pi/4) ≈ 0.707.Formulas: Area of circle: pi * r^2. Example: pi * 5^2 = 78.54.Examples Calculator expression examples.
Basic math 2 + 2 * 38Order of operations: multiply first, then add.
Scientific sqrt(16) + 2^312sqrt(16) = 4, 2^3 = 8, 4 + 8 = 12.
Technical reference Supported functions and constants.
Basic ops + (add), - (subtract), * (multiply), / (divide), % (modulo), ^ (exponent). Trig sin, cos, tan, asin, acos, atan. Angles in radians. Convert: degrees * pi / 180. Logarithms log (base 10), ln (natural log, base e), exp (e^x). Roots sqrt (square root), cbrt (cube root), pow(base, exp). Constants pi ≈ 3.14159, e ≈ 2.71828, phi ≈ 1.61803. Common mistakes to avoid Forgetting parentheses (wrong order) Why it happens: 2 + 3 * 4 = 14 (not 20). Multiplication before addition.
How to avoid it: Use parentheses: (2 + 3) * 4 = 20. Explicit order.
Frequently asked questions How do I calculate degrees (not radians)? Convert: degrees * pi / 180. Example: sin(45 degrees) = sin(45 * pi / 180).
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