GCD & LCM Calculator
Calculator ToolsHCF and LCM of two or more numbers
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All history →GCD & LCM Calculator — at a glance
Find the greatest common divisor (GCD / HCF) and least common multiple (LCM) of two or more whole numbers at once.
12, 18, 24
Run
GCD 6
LCM 72
How to use it — step by step
Two or more whole numbers.
1
Paste your input
Paste or type your content into the big input box. Try a sample if you want to see it work.
2
Choose options
Pick the mode and options that fit what you need.
3
Find GCD & LCM
Press the button. The result is created instantly on your device.
4
Copy the result
Check the output and press Copy to use it anywhere.
Pro tips
Small things that make the result better.
✦GCD is also called HCF (highest common factor).
✦LCM is useful for adding fractions with different denominators.
✦GCD × LCM equals the product of two numbers.
Quick facts
Freeno signup, no limit
Instantresult in a moment
Privatenothing is uploaded
Any devicephone, tablet or PC
Frequently Asked Questions
What is the GCD of 12 and 18?+
6 — the largest number that divides both.
Is my data safe?+
Yes. Everything runs inside your own browser. Your text, files and images are never uploaded to any server.
Is this tool really free?+
Yes — completely free, no signup, no watermark and no usage limit.
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