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GCD Calculator

Euclid’s remainder algorithm finds the greatest common divisor.

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How GCD Calculator works

Euclid’s remainder algorithm finds the greatest common divisor.

Try an example

48, 18 → 6.

Good to know

Safe integers only. GCD(0,0) is returned as 0 by convention.

Your privacy

Processing happens on this device for this tool. We do not upload your input, put it in share links or save it to your favourites. Closing this tab discards the working input; downloaded results remain wherever you save them.

When this tool is useful

Use GCD Calculator when you need a quick, local result and want the rule or limitation visible alongside it.

How to use it

  1. Enter the input using the labels shown.
  2. Run the operation and review the result.
  3. Download or copy the result only after checking it.

Checks before you rely on the result

  • Safe integers only. GCD(0,0) is returned as 0 by convention.
  • Keep the original input when the operation creates a new copy.
  • Use the related tools below when the next step needs a different format.

This page is maintained with the tool implementation and its deterministic tests. If the result looks wrong, report the issue with a non-sensitive example.

Read the GCD Calculator instructions

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