Furlong

A furlong is a measure of distance within Imperial units and U.S. customary units. Although its definition has varied historically, in modern terms it equals 660 feet or 220 yards, and is therefore equal to 201.168 metres. There are ten chains in a furlong and eight furlongs in a mile. The name "furlong" derives from the Old English words furh (furrow) and lang (long). It originally referred to the length of the furrow in one acre of a ploughed open field (a medieval communal field which was divided into strips). The system of long furrows arose because turning a team of oxen pulling a heavy plough was difficult. This offset the drainage advantages of short furrows and meant furrows were made as long as possible. For this reason, it was once also called an acre's length.

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Distances for thoroughbred horse races in the United Kingdom, Ireland and the United States are given alternately in miles and furlongs (example), but the unit is otherwise no longer in common use — and even in that discipline its usage is confined mainly to denoting distances of less than one mile. Its official use was abolished in the United Kingdom under the Weights and Measures Act 1985, which also abolished from official use many other traditional units of measurement.

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Coincidentally, 5 furlongs is 1005.84 metres (exactly) and is therefore approximately 1 kilometre.

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Distance: :This article is about distance in the mathematical / physical sense. For other uses, see distance (disambiguation)....

Imperial units: :This article is about the post-1824 measures used in the British Empire and countries in the British sphere of influence. For information about the units used in England before 1824, see English units. For information about the units used in the US, see United States customary units. For informatio...

U.S. customary units: The U.S. customary units, commonly known in the United States as English units or standard units, are the non-SI (non-metric) units of measurement that are currently used in the U.S., in some cases alongside the International System of Units. This system of units is similar to, but not to be confuse...