Chain (unit)

A chain was a unit of length. It is part of the imperial and United States customary systems. It was used for measuring land. The short way of writing chains is ch.

There are a number of different definitions of the chain, from 50 to 100 feet long. In the imperial system, one chain is equal to 66 feet or 20.1168 metres. This is also called a Gunter's chain, surveyor's chain or land chain.