Yard
A yard is a unit of length used mainly in the United States, the United Kingdom, and some other countries. One yard equals 3 feet or 36 inches, which is about 0.91 meters. Yards are often used to measure things like fabric, sports fields, or short distances. For example, an American football field is 100 yards long. The abbreviation for yard is "yd". While the metric system is widely used worldwide, yards are still common in everyday life and certain industries in countries that use the imperial system.
Chain
A chain is a unit of length traditionally used in land surveying. The most common version is the Gunter’s chain, which equals 66 feet or 22 yards, approximately 20.1168 meters.
The chain was introduced by English clergyman Edmund Gunter in the 17th century to simplify land measurement. One chain consists of 100 links, each 0.66 feet long. It became a standard unit in British and American land surveying and was instrumental in defining land areas, especially in the U.S. Public Land Survey System.
Key Conversions:
1 chain = 66 feet
1 chain = 22 yards
1 chain ≈ 20.1168 meters
10 chains = 1 furlong
80 chains = 1 mile
Though now largely replaced by metric units and modern surveying tools, the chain still appears in older land deeds, maps, and rural property descriptions.