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Greatest Common Factor Calculator

Find the greatest common factor (GCF) — also called the greatest common divisor (GCD) — of two integers using the Euclidean algorithm. The largest number that divides both inputs evenly; used everywhere from simplifying fractions to designing tilings to cryptography.

First Number

Second Number

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Math

Least Common Multiple Calculator

Find the least common multiple (LCM) of two positive integers — the smallest number that both divide evenly into. Indispensable for adding fractions with unlike denominators, synchronising periodic events, and scheduling tasks that repeat on different cycles.

First Number

Second Number

Fill in the required fields to see your result.

Key differences

	Greatest Common Factor Calculator	Least Common Multiple Calculator
Category	Math	Math
Inputs required	2	2
Result	Greatest Common Factor	LCM
What it does	Find the greatest common factor (GCF) — also called the greatest common divisor (GCD) — of two integers using the Euclidean algorithm. The largest number that divides both inputs evenly; used everywhere from simplifying fractions to designing tilings to cryptography.	Find the least common multiple (LCM) of two positive integers — the smallest number that both divide evenly into. Indispensable for adding fractions with unlike denominators, synchronising periodic events, and scheduling tasks that repeat on different cycles.