Greatest Common Factor Calculator


Do not rely on the results!

Here is a handy little calculator you can use to find the
greatest common factor (GCF) of two or three numbers.

It is the "greatest" thing for simplifying fractions!



  • it can handle decimal numbers, even though GCF is supposed to be for whole numbers only.
  • if you put in a negative number it gives a positive GCF.


Maybe you wanted the Least Common Multiple (LCM) Calculator ... ?