LCM Calculator Home › Math › LCM Calculator LCM Calculator Enter 2–12 numbers 12, 18, 30 Separate with commas, spaces or semicolons. Whole numbers only. Show steps using GCF / GCD method Prime factorization Division / ladder method Listing multiples Calculate LCM Reset 4.9/5 - (654 votes) Results Enter numbers and select Calculate LCM to see the result, steps and charts. Least Common Multiple Greatest common factor Number of inputs Copy result Share Print Download TXT Step-by-step solution