GCD and LCM Calculator
Find the greatest common divisor and least common multiple of two or more numbers. The result updates as you type, with the working underneath so you can check it.
Your details
Result
GCD (greatest common divisor)
6
- LCM (least common multiple)
- 180
Good to know: LCM(a, b) = a × b ÷ GCD(a, b)
About this tool
Formula
LCM(a, b) = a × b ÷ GCD(a, b)
Questions people ask
What is GCD used for?
Simplifying fractions: divide the numerator and denominator by their GCD.
Related tools
How we calculate this
We use the standard published formula or definition for this calculation, and we show the working so you can check it.
Spotted a mistake? Tell us and we'll check it. How we check our calculators