Calculator

How to Use the Scientific Calculator

1. Basic Arithmetic: Click number buttons (0-9) and operators (+, −, ×, ÷) to build expressions. Press "=" to evaluate. Use "AC" to clear everything or the backspace button (⌫) to delete the last digit.
2. Scientific Functions: Use √ (square root), x² (square), xⁿ (power), sin, cos, tan (trigonometric in degrees), log (base-10 logarithm), 1/x (reciprocal), and |x| (absolute value).
3. Constants: Click "π" to insert Pi (3.14159...) or "e" for Euler's number (2.71828...).
4. Keyboard Support: Type numbers and operators directly from your keyboard. Press Enter or = to evaluate, Escape to clear, Backspace to delete.
5. History: Every calculation is logged in the History panel below. Click "Clear" to erase the history log.

Technical Overview & Use Cases

This scientific calculator implements immediate-execution logic (like physical calculators) rather than expression parsing. Operations are performed sequentially: entering a second operator evaluates the pending operation first (operator chaining). Trigonometric functions accept input in degrees and convert internally using value × π / 180. Results are computed with JavaScript's 64-bit floating-point precision (IEEE 754 double), providing approximately 15-17 significant decimal digits of accuracy.

Real-world use cases:

• Engineering calculations: Quickly compute trigonometric values, logarithms, and powers for structural analysis, circuit design, or physics problems without switching to a desktop app.
• Financial math: Calculate percentages, compound interest approximations, and unit cost comparisons using the percentage and power functions.
• Programming assistance: Verify arithmetic operations, compute hash collision probabilities, or check algorithmic complexity values during development.

Privacy & Security Guarantee

This tool is part of the FAK LAB ecosystem, founded by Faizan Ahmad Khan Khichi. All calculations execute entirely in your browser using JavaScript's native Math library. No expressions are sent to any server, no calculation history is stored remotely, and no analytics track what you compute. Your mathematical work remains completely private on your device.

Frequently Asked Questions

Are trigonometric functions in degrees or radians?

This calculator uses degrees. When you enter sin(90), it returns 1 (not 0.894 which would be sin(90 radians)). Internally, the value is converted to radians before calling Math.sin(), but you always input in degrees — the familiar standard for most practical applications.

Why do some decimal results show many digits?

JavaScript uses IEEE 754 double-precision floating-point, which can produce results like 0.1 + 0.2 = 0.30000000000000004. This is a fundamental property of binary floating-point representation, not a bug. For display purposes, results with excessive decimals are shown in full precision so you can round as needed for your use case.

Does it support order of operations (PEMDAS)?

This calculator uses immediate execution (left-to-right evaluation), similar to basic physical calculators. Each operator evaluates the previous pending operation. For complex expressions requiring strict PEMDAS order, break them into steps using the history feature to track intermediate results.