GCD Calculator
Find the greatest common divisor of two or more numbers instantly, using the Euclidean algorithm.
How it works
- 1
Enter your numbers
Two or more whole numbers, separated by commas.
- 2
Get the GCD
The largest number that divides all of them evenly.
- 3
Use it to simplify
Divide a fraction by the GCD of its terms to simplify it.
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Frequently asked questions
GCD is the largest number that divides both values; LCM is the smallest number both values divide into.
What the greatest common divisor is for
The GCD (or GCF, greatest common factor) of two numbers is the largest number that divides both evenly. The GCD of 12 and 18 is 6.
It is used to simplify fractions, split items into equal groups, and solve problems involving repeating patterns or tiling.