The chain is a unit of length equal to 66 feet (22 yards). It is subdivided into 100 links[1][2] or 4 rods. There are 10 chains in a furlong, and 80 chains in one statute mile.[2] In metric terms, it is 20.1168 m long.[2] By extension, chainage (running distance) is the distance along a curved or straight survey line from a fixed commencing point, as given by an odometer.

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chain
Unit systemimperial/US units
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   imperial/US units   22 yd
   metric (SI) units   20.1168 m
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The chain has been used for several centuries in England and in some other countries influenced by English practice. In the United Kingdom, there were 80 chains to the mile, but until the early nineteenth century the Scottish and Irish customary miles were longer than the statute mile; consequently a Scots chain was about 74 (imperial) feet,[3] an Irish chain 84 feet. These longer chains became obsolete following the adoption of the imperial system of units in 1824.[4]

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