GCD and LCM Calculator
Greatest common divisor and least common multiple.
How it works
GCD uses the Euclidean algorithm. LCM = |a × b| ÷ GCD.
FAQ
Is this calculator free?
Yes. No signup is needed and nothing you enter is stored.
Is the result exact?
Results are rounded for display. For financial, medical, or legal decisions, confirm with a professional.
Do my numbers leave my device?
No. The calculation runs in your browser.