Basic Calculator

A clean, fast online calculator for all basic arithmetic operations.

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Basic Calculator Formula & How It Works

a + b | a − b | a × b | a ÷ b
  • Addition: sum of two numbers
  • Subtraction: difference between two numbers
  • Multiplication: product of two numbers
  • Division: quotient of two numbers (b ≠ 0)

The four arithmetic operations are the foundation of all mathematics. Division by zero is undefined. For chain calculations, apply BODMAS / PEMDAS: Brackets first, then Orders (exponents), Division and Multiplication (left to right), then Addition and Subtraction (left to right).

Basic Calculator FAQs

What is BODMAS / PEMDAS?

Order of operations: Brackets/Parentheses first, then Orders/Exponents, then Division and Multiplication (left to right), then Addition and Subtraction (left to right). Example: 2 + 3 × 4 = 2 + 12 = 14 (not 20).

What is division by zero?

Division by zero is undefined and has no numerical answer. Any number divided by zero is not equal to infinity — it is simply undefined. Calculators display 'Error' or 'Undefined' for this operation.

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