Is the LCM & GCF free to use?

Yes, the LCM & GCF is completely free. There is no sign-up, no account required, and no limit on how often you can use it.

How accurate is the LCM & GCF?

The LCM & GCF uses standard mathematical formulas and produces results accurate to standard precision. For critical applications, always verify with an authoritative source.

What devices does the LCM & GCF work on?

The LCM & GCF works on any device with a modern web browser — desktop, laptop, tablet, or phone. It is mobile-friendly and works offline once the page has loaded.

🔢 Number Tools

LCM and GCF Calculator

Find the Lowest Common Multiple (LCM) and Greatest Common Factor (GCF/HCF) of up to 6 numbers. Shows prime factorisation.

The LCM & GCF is a free online tool that helps you find the lowest common multiple (lcm) and greatest common factor (gcf/hcf) of up to 6 numbers. shows prime factorisation It runs in your browser with no sign-up, downloads, or installation needed. All processing happens locally — your data stays on your device.

Enter up to 6 numbers (one per box)

How to use the LCM & GCF

Enter your numbers

Type 2–6 numbers. The GCF (greatest common factor, also called GCD or HCF) and LCM (lowest common multiple) are calculated instantly. You can use 2 numbers for basic calculations or up to 6 for more complex ones.

What they mean

The GCF is the largest number that divides all the inputs exactly — useful for simplifying fractions and ratios. The LCM is the smallest number that all the inputs divide into — useful for finding common denominators and scheduling problems.

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