GCD and LCM Calculator
Enter two integers to see their exact GCD (GCF) and LCM.
A QUICK WALKTHROUGH
How to use this tool
- Enter two signed integers.
- Choose Calculate.
- Read the exact GCD (GCF) and LCM.
Exact integer arithmetic
Signed decimal integers up to 1,000 digits use BigInt. Results are limited to 2,000 digits.
Zero and negative values
Signs do not affect results. gcd(0,n)=|n|; LCM is 0 when either value is zero. Both values cannot be zero.
GOOD TO KNOW
Common questions
Is GCF different from GCD?
No. GCF (greatest common factor) is another name for GCD (greatest common divisor).
What is gcd(0,n)?
It is the absolute value of n.
What is lcm(0,n)?
It is 0 by convention.