The greatest common divisor is the largest positive number that divides two or more non zero numbers without a remainder. Which is abbreviated as GCD. The greatest common divisor is also known as GCF (greatest common factor) and HCF (highest common factor).

GCD Calculator is an online tool which will help us to calculate the GCM of any given numbers.  
The following are the steps to calculate the GCD of a number 

Step 1: Enter any two numbers in the calculator.

           Example : Enter Number 1 = a  and  Enter Number 2 = b

Step 2: The calculator will give the GCD of given two numbers. Greatest common factor of any two number is unique.