50 · Calculators

LCM & GCF Calculator

Enter two or more whole numbers to get their greatest common factor and least common multiple.

Two or more, separated by commas or spaces.

Greatest common factor (GCF)

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How to use the lcm & gcf calculator

  1. Type two or more whole numbers.
  2. Separate them with commas or spaces.
  3. Read the GCF and LCM.

When you need them

The GCF is the biggest number that divides all of them; it’s used to simplify fractions. The LCM is the smallest number they all divide into; it’s used to add fractions with different denominators.

Examples

12, 18, 30

GCF 6 · LCM 180

8, 12

GCF 4 · LCM 24

Questions

Are GCF, GCD and HCF the same?

Yes. Greatest common factor, greatest common divisor and highest common factor all mean the same thing.

How many numbers can I enter?

As many as you like, as long as the LCM stays below about 9 quadrillion.