Math Calculators

GCF and LCM Calculator

Find the Greatest Common Factor (GCF) and Least Common Multiple (LCM) of two whole numbers.

GCF —

LCM —

About the GCF and LCM Calculator

The Greatest Common Factor (GCF) is the largest number that divides evenly into both numbers. The Least Common Multiple (LCM) is the smallest number that both numbers divide into evenly.

Formula: GCF is found using the Euclidean algorithm; LCM = (a × b) ÷ GCF.

These are essential for simplifying fractions, finding common denominators and solving ratio problems.