Scientific Calculator Guide

What does this tool do

The Scientific Calculator evaluates arithmetic expressions and scientific functions in your browser. Switch between Simple mode (basic operations) and Advanced mode for trigonometry, logarithms, powers, square roots, and more. Supports constants like π and e, and respects degrees or radians for trig functions. No installation or sign-up required.

How to use it

1. Choose mode — Toggle between Simple and Advanced at the top. Simple mode shows basic keys; Advanced adds scientific functions.
2. Enter expressions — Type or tap numbers and operators. Use the on-screen keypad or your keyboard.
3. Use functions — In Advanced mode, tap sin, cos, tan, log, ln, sqrt, and others. Select degrees (°) or radians (rad) for trig.
4. View result — The result appears instantly. Invalid expressions show an error message (Overflow, Underflow, or Math error).
5. Chain calculations — Use Ans to reuse the last result in the next expression.

How it works

The calculator uses a shunting-yard algorithm to parse and evaluate expressions. This is a deterministic, safe approach—no eval() or Function() is used. Expressions are tokenised, converted to postfix notation, then evaluated with a stack. Trigonometric functions (sin, cos, tan, asin, acos, atan) respect the selected angle unit (degrees or radians). Results of Infinity, -Infinity, or NaN are displayed as human-readable errors.

All computation runs entirely in your browser. No data is sent to any server.

Use cases & examples

• Homework — Evaluate expressions and check your algebra.
• Quick math — Compute compound interest, trig values, or logarithms.
• Unit conversion — Use for intermediate calculations (e.g. converting angles).
• Engineering — Square roots, powers, and scientific notation.

Example

• 2 + 3 × 4 → 14
• sqrt(16) + sin(30) (degrees) → 4.5
• ln(e^2) → 2

Limitations & known constraints

• Deterministic parser — Only standard operators and supported functions work; custom syntax is not accepted.
• Precision — JavaScript number precision (about 15–17 significant digits) applies.
• Large numbers — Very large or tiny results may show as Overflow or Underflow.
• Factorial — Factorial is supported for non-negative integers only.