This free online greatest common factor tool will find the GCF of 2, 3, or 4 numbers at once with the click of a button.
Plus, in addition to displaying the GCF, the calculator will also display the GCF divisors and all factors for the numbers entered.
Also, if you would ever like to save some time when attempting to find the least common multiple (LCM) for up to 4 numbers, be sure to check out my Least Common Multiple Calculator.
The factors of a number is the set of all nonzero numbers that divide into the number evenly. For example, the factors of the number 12 would be as follows:
Common factors occur when two or more numbers share one or more of the same factors. For example, the numbers 12 and 20 have the following factors, with the common factors appearing in orange:
The greatest common factor (A.K.A: GCF, Greatest Common Divisor, GCD) is the highest factor that two or more numbers share. Referring back to the numbers 12 and 20, the GCF would be 4 based on the following set of common factors:
The most common use of finding the GCF is for reducing or simplifying fractions, which we will cover on the various fraction calculator pages.
With that, let's use the Greatest Common Factor Calculator to find the GCF of up to 4 different numbers.

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