GCD & LCM Calculator
Compute Greatest Common Divisor (HCF) and Least Common Multiple of any list of integers. Shows prime factorisation for each number — useful for understanding why the answers are what they are.
What powers the GCD & LCM Calculator
GCD / HCF of any list
LCM of any list
Prime factorisation per number
Identity check (GCD × LCM = product)
Why the GCD & LCM Calculator is different
Browser-native
The GCD & LCM Calculator runs entirely in your browser. Input is processed locally — never uploaded, never logged, never cached anywhere outside your device.
No artificial limits
No daily quotas, no character ceilings, no "upgrade for more" walls. Every feature is the complete feature — the same on the first use as the thousandth.
Production-grade quality
Built to the same engineering bar as paid SaaS tools — accurate algorithms, audited logic, responsive design and accessibility-tested interactions.
Common use contexts
- Number theory homework
- Fraction reduction
- Pattern / cycle problems
- Scheduling problems (LCM)
Private and secure
Zero upload
All processing happens in your browser. Input is never transmitted, logged or cached.
Works offline
Once the page loads, the tool runs without an internet connection. No network calls happen during use.
No tracking
No accounts, no cookies for tool state. Only aggregate analytics count visits at the page level.