GCD and LCM Calculator Online Free
Compute the GCD (greatest common divisor) and LCM (least common multiple) of several numbers.
PGCD / GCD
6
PPCM / LCM
72
Euclid’s algorithm (BigInt), 100% local. Works with 2 or more numbers.
🔒 100% client-side — no data sent
Compute the GCD (greatest common divisor) and LCM (least common multiple) of several numbers instantly. The tool runs in your browser with no sign-up, helping you simplify fractions and solve arithmetic exercises.
What is it for?
- ▸ Simplify a fraction by finding the GCD of the numerator and denominator.
- ▸ Find a common denominator using the LCM to add fractions.
- ▸ Check a middle school or high school arithmetic exercise.
- ▸ Compute the GCD or LCM of more than two numbers at once.
FAQ
What is the difference between GCD and LCM?
The GCD is the largest number that divides all the given numbers, while the LCM is the smallest multiple common to all of them.
Can I calculate with more than two numbers?
Yes, the tool accepts several numbers at once and returns their shared GCD and LCM.
How is the GCD calculated?
The GCD is obtained using Euclid's algorithm, and the LCM follows from the relation GCD × LCM = product of the numbers.