# Chain girth

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**Chain girth** is a [measurement](/source/Measurement) of a [yacht](/source/Yacht) [hull](/source/Hull_(watercraft)).

Chain girth is specified in some design rules to handicap or match the capabilities of [sailing vessels](/source/Sailboat) of similar design such as the [12 metre](/source/12_metre) boats. Chain girth is measured as a straight line from a given elevation on the hull near the [waterline](/source/Waterline) vertically from a specified fore-and-aft position and diagonally as viewed from the bow to a point on the hull near the keel. It differs from the [skin girth](/source/Skin_girth) which is measured following the surface of the hull.

## External links

- [Current Class Rules for 2.4M boats - note appendix section H](https://web.archive.org/web/20080517211214/http://www.inter24metre.org/links/CurrentClassRules.pdf)

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Adapted from the Wikipedia article [Chain girth](https://en.wikipedia.org/wiki/Chain_girth) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Chain_girth?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.