GCD and LCM Calculator
Find the greatest common divisor and least common multiple of two positive integers. Use both answers to check fraction work and repeating schedules.
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Result
Enter the required values to see your result. Use the example to try the complete calculation.
Both inputs must be positive integers up to ten million. Euclid’s algorithm finds the divisor; the product divided by it gives the multiple.
How this calculation works
GCD and LCM Calculator
Find the greatest common divisor and least common multiple of two positive integers. Use both answers to check fraction work and repeating schedules.
Units and limits
Both inputs must be positive integers up to ten million. Euclid’s algorithm finds the divisor; the product divided by it gives the multiple.
Formulas
- Calculation
- LCM(a,b) = a × b / GCD(a,b)
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Discover VISU LinkHow to use it
- Choose the operation when available and enter your own values in the labelled fields.
- Check the units and the limits explained below before interpreting the answer.
- Read the result and its details. Copy it or download a result card; no account is required.
Examples
Worked example
For 18 and 24, the GCD is 6 and the LCM is 72.
Another case
For 7 and 9, the GCD is 1 and the LCM is 63.
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Questions
What does this tool calculate?
Find the greatest common divisor and least common multiple of two positive integers. Use both answers to check fraction work and repeating schedules.
Which inputs and units should I use?
Both inputs must be positive integers up to ten million. Euclid’s algorithm finds the divisor; the product divided by it gives the multiple.
Can I check a worked example?
For 18 and 24, the GCD is 6 and the LCM is 72.
Are my input values uploaded or stored?
No. The calculation runs in this browser. Typed values are not sent to analytics, placed in the page URL or saved by the calculator. Copying or downloading is an action you choose.
Do I need an account or a paid plan?
No. The calculation, example, result copy and result card are available without registration. VISU services are an optional next step.