*GCD* or **HCF Calculator** is the online tool specially programmed to find out the Greatest Common Divisor of the given numbers. The HCF - Highest Common Factor is also called as GCF - Greatest Common Factor, GCD - Greatest Common Divisor and GCM - Greatest Common Measure. The GCD or HCF or GCF of two or more numbers is the greatest number that divides each one of them exactly. To find out GCD or HCF, the calculator expresses each one of the given numbers as the product of prime factors. The product of least powers of common prime factors gives GCF