This calculator will help you find the greatest common factor (GCF) of two numbers. For example,

What is the Greatest Common Factor of 12 and 16? Select the first number (e.g. '12') and the second number (e.g. '16'). After that click the 'Calculate' button.

Greatest Common Factor (GCF) also known as the Greatest Common Divisor (GCD) or Highest Common Factor (HCF) - it is the largest positive integer that divides each of the integers with zero remainder