Standard Calculator

A fast, simple, accurate online calculator for everyday arithmetic. Supports addition, subtraction, multiplication, division, square roots, percentages, and memory functions.

What This Standard Calculator Can Do

This simple calculator performs all common arithmetic operations and includes memory buttons for quick repetitive calculations. It works on desktop and mobile, supports keyboard input, and displays results instantly.

Supported Operations

  • Addition, subtraction, multiplication, division
  • Percentage calculation
  • Square root (√)
  • Decimal operations
  • Memory functions (MC, MR, M+, M−)

Percentage Calculation Formula

A % B = (A × B) ÷ 100  
Example: 20% of 150 = (20 × 150) ÷ 100 = 30

Memory Key Explanation

  • MC: Clear memory
  • MR: Recall memory
  • M+: Add displayed number to memory
  • M−: Subtract displayed number from memory

Frequently Asked Questions

Yes, operations are evaluated in mathematical precedence order.
Yes. You can type numbers and operators directly using your keyboard.
Yes, it follows standard percentage math used in financial and scientific calculations.