LCM Calculator
Find the least common multiple of two or more numbers, with prime factorization steps.
Enter your values to see the result.
Continue your work
- GCF & HCF Calculator — Find the greatest common factor.
- Fraction Calculator — Add fractions with different denominators.
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Clear instructions
Find steps, examples and limitations below.
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How to use the LCM Calculator
Find the least common multiple of two or more numbers, with prime factorization steps.
- 1 Enter two or more whole numbers separated by commas or spaces.
- 2 Read the LCM at the top.
- 3 Check the prime factors to see how it is built.
Example and practical tips
Buses leave every 12, 18 and 30 minutes. The LCM of 12, 18 and 30 is 180, so they all leave together every 3 hours.
Frequently asked questions
How is the LCM found?
Take every prime factor at its highest power in any number: 12 = 2² × 3, 18 = 2 × 3², 30 = 2 × 3 × 5, so LCM = 2² × 3² × 5 = 180.
Where is the LCM used?
Finding common denominators for fractions and scheduling repeating events are the most common uses.
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