FREE CALCULATOR
LCM Calculator
Find the least common multiple of two whole numbers.
Least common multiple36
CALCULATOR GUIDE
About the LCM Calculator
Find the least common multiple of integers for common denominators or repeating-cycle problems.
How to use this calculator
- Enter the values requested by the calculator and check their units.
- Choose assumptions that match the scenario you want to estimate.
- Review the result and change one input at a time to compare scenarios.
- Verify important decisions against the relevant agreement, institution or official guidance.
How the calculation works
The LCM is the smallest positive integer that is a multiple of each input.
Example
Multiples of 4 and 6 first meet at 12, so their LCM is 12.
Things to keep in mind
- Enter positive integers for the standard school-math use case.
- For two nonzero integers, LCM(a,b) = |a × b| ÷ GCF(a,b).
- The result is an estimate based on the inputs and assumptions provided.
- Check applicable terms and official guidance before making financial, employment or academic decisions.
Frequently asked questions
When is LCM useful?
It is useful for common denominators, repeating schedules and finding when cycles align.
Are results guaranteed or official?
No. The tool provides an estimate or arithmetic result and may not include every real-world rule, fee or policy.
Can I compare scenarios?
Yes. Change one input at a time to see how it affects the result.