About the GCF & LCM Calculator
A free tool for finding the greatest common factor and least common multiple of any set of integers.
What it is
This calculator breaks each number you enter into its prime factors, then derives the GCF (lowest shared prime powers) and LCM (highest prime powers across all numbers), displaying the full factorization table so you can see exactly how each result was built.
Features
Any number of integers
Works for two numbers or a whole list.
Prime factorization table
See each number's prime powers side by side.
GCF and LCM together
Both results computed at once, no need to run twice.
Instant, private
Runs entirely in your browser. No data is sent anywhere.