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Quick answer: enter two or more numbers above — the calculator instantly finds their least common multiple, e.g. LCM of 6 and 10 is 30.
LCM calculator
Short answer: the LCM (least common multiple) is the smallest number divisible by all your numbers. Enter them above — e.g. LCM(4, 6, 8) = 24.
Least common multiple
Short answer: the least common multiple of 6 and 10 is 30 — the smallest number both divide into evenly. The calculator uses LCM(a,b) = |a × b| ÷ GCD(a,b), extended across all numbers.
What is LCM in math?
Short answer: LCM means least common multiple — the smallest positive integer that is a multiple of each number in a set. It's also called the least common denominator when adding fractions.
Frequently asked questions
What is the LCM of 6 and 10?
30. Multiples of 6: 6, 12, 18, 24, 30… Multiples of 10: 10, 20, 30… The smallest shared multiple is 30. Enter any numbers above for an instant answer.
How do you find the LCM of two numbers?
Use LCM(a, b) = |a × b| ÷ GCD(a, b). For 6 and 10: (6 × 10) ÷ 2 = 30. The calculator above does this automatically for two or more numbers.
What is the difference between LCM and GCF?
LCM is the smallest number both divide into (LCM of 6 and 10 is 30); GCF is the largest number dividing both (GCF of 6 and 10 is 2). Try our GCF calculator for the other one.
Can I find the LCM of more than two numbers?
Yes — enter up to 12 numbers separated by commas or spaces. The calculator applies the pairwise LCM across all of them.
What is the least common denominator?
It's the LCM of the denominators — the smallest denominator that works for all fractions in a sum. Find it with the LCM calculator above.
Is this LCM calculator free?
Yes — unlimited calculations, free forever. No account, no limits. Everything runs in your browser.