A furlong is a measure of
distance
Distance is a numerical or occasionally qualitative measurement of how far apart objects or points are. In physics or everyday usage, distance may refer to a physical length or an estimation based on other criteria (e.g. "two counties over"). ...
in
imperial units
The imperial system of units, imperial system or imperial units (also known as British Imperial or Exchequer Standards of 1826) is the system of units first defined in the British Weights and Measures Act 1824 and continued to be developed th ...
and
United States customary units equal to one eighth of a
mile
The mile, sometimes the international mile or statute mile to distinguish it from other miles, is a British imperial unit and United States customary unit of distance; both are based on the older English unit of length equal to 5,280 English ...
, equivalent to 660
feet
The foot ( : feet) is an anatomical structure found in many vertebrates. It is the terminal portion of a limb which bears weight and allows locomotion. In many animals with feet, the foot is a separate organ at the terminal part of the leg made ...
, 220
yard
The yard (symbol: yd) is an English unit of length in both the British imperial and US customary systems of measurement equalling 3 feet or 36 inches. Since 1959 it has been by international agreement standardized as exactly ...
s, 40
rods, 10
chains
A chain is a serial assembly of connected pieces, called links, typically made of metal, with an overall character similar to that of a rope in that it is flexible and curved in compression but linear, rigid, and load-bearing in tension. A c ...
or approximately 201
metre
The metre (British spelling) or meter (American spelling; see spelling differences) (from the French unit , from the Greek noun , "measure"), symbol m, is the primary unit of length in the International System of Units (SI), though its pref ...
s. It is now mostly confined to use in horse racing, where in many countries it is the standard measurement of race lengths, and agriculture, where is it used to measure rural field lengths and distances.
In the
United States
The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territorie ...
, some states use older definitions for surveying purposes, leading to variations in the length of the furlong of two parts per million, or about . This variation is too small to have practical consequences in most applications.
Using the
international definition of the yard as exactly 0.9144
metre
The metre (British spelling) or meter (American spelling; see spelling differences) (from the French unit , from the Greek noun , "measure"), symbol m, is the primary unit of length in the International System of Units (SI), though its pref ...
s, one furlong is 201.168 metres, and five furlongs are about 1
kilometre
The kilometre ( SI symbol: km; or ), spelt kilometer in American English, is a unit of length in the International System of Units (SI), equal to one thousand metres (kilo- being the SI prefix for ). It is now the measurement unit used for ex ...
( exactly).
History
The name ''furlong'' derives from the
Old English
Old English (, ), or Anglo-Saxon, is the earliest recorded form of the English language, spoken in England and southern and eastern Scotland in the early Middle Ages. It was brought to Great Britain by Anglo-Saxon settlement of Britain, Anglo ...
words ' (furrow) and ' (long). Dating back at least to early
Anglo-Saxon times, it originally referred to the length of the furrow in one
acre
The acre is a unit of land area used in the imperial
Imperial is that which relates to an empire, emperor, or imperialism.
Imperial or The Imperial may also refer to:
Places
United States
* Imperial, California
* Imperial, Missouri
* Imp ...
of a ploughed
open field (a medieval communal field which was divided into strips). The furlong (meaning furrow length) was the distance a team of oxen could plough without resting. This was standardised to be exactly 40 rods or 10 chains. 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. An acre is an area that is one furlong long and one
chain (66 feet or 22 yards) wide. For this reason, the furlong was once also called an acre's length, though in modern usage an area of one acre can be of any shape. The term furlong, or shot, was also used to describe a grouping of adjacent strips within an open field.
Among the early Anglo-Saxons, the rod was the fundamental unit of land measurement. A furlong was 40 rods; an acre 4 by 40 rods, or 4 rods by 1 furlong, and thus 160 square rods; there are 10 acres in a square furlong. At the time, the Saxons used the North German foot, which was about 10 percent longer than the foot of the
international 1959 agreement. When England
changed to a shorter foot in the late 13th century, rods and furlongs remained unchanged, since property boundaries were already defined in rods and furlongs. The only thing that changed was the number of feet and yards in a rod or a furlong, and the number of square feet and square yards in an acre. The definition of the rod went from 15 old feet to new feet, or from 5 old yards to new yards. The furlong went from 600 old feet to 660 new feet, or from 200 old yards to 220 new yards. The acre went from 36,000 old square feet to 43,560 new square feet, or from 4,000 old square yards to 4,840 new square yards.
The furlong was historically viewed as being equivalent to the
Roman stade (''stadium''), which in turn derived from the
Greek system
Fraternities and sororities are social organizations at colleges and universities in North America.
Generally, membership in a fraternity or sorority is obtained as an undergraduate student, but continues thereafter for life. Some accept gradua ...
. For example, the
King James Bible uses the term "furlong" in place of the Greek ''stadion'', although more recent translations often use miles or kilometres in the main text and give the original numbers in footnotes.
In the Roman system, there were 625 feet to the ''stadium'', eight ''stadia'' to the mile, and three miles to the
league
League or The League may refer to:
Arts and entertainment
* ''Leagues'' (band), an American rock band
* ''The League'', an American sitcom broadcast on FX and FXX about fantasy football
Sports
* Sports league
* Rugby league, full contact footba ...
. A league was considered to be the distance a man could walk in one hour, and the mile (from ''mille'', meaning "thousand") consisted of 1,000 ''passus'' (paces, five feet, or double-step).
After the fall of the
Western Roman Empire
The Western Roman Empire comprised the western provinces of the Roman Empire at any time during which they were administered by a separate independent Imperial court; in particular, this term is used in historiography to describe the period ...
, medieval Europe continued with the Roman system, which the people proceeded to diversify, leading to serious complications in trade, taxation, etc. Around the year 1300, by royal decree England standardized a long list of measures. Among the important units of distance and length at the time were the
foot,
yard
The yard (symbol: yd) is an English unit of length in both the British imperial and US customary systems of measurement equalling 3 feet or 36 inches. Since 1959 it has been by international agreement standardized as exactly ...
,
rod (or pole), furlong, and the
mile
The mile, sometimes the international mile or statute mile to distinguish it from other miles, is a British imperial unit and United States customary unit of distance; both are based on the older English unit of length equal to 5,280 English ...
. The rod was defined as yards or feet, and the mile was eight furlongs, so the definition of the furlong became 40 rods and that of the mile became 5,280 feet (eight furlongs/mile times 40 rods/furlong times feet/rod).
A description from 1675 states, "Dimensurator or Measuring Instrument whereof the mosts usual has been the Chain, and the common length for English Measures four Poles, as answering indifferently to the Englishs Mile and Acre, 10 such Chains in length making a Furlong, and 10 single square Chains an Acre, so that a square Mile contains 640 square Acres." —John Ogilby, Britannia, 1675
The official use of the furlong was abolished in the United Kingdom under the
Weights and Measures Act
A weights and measures act is a kind of legislative act found in many jurisdictions establishing technical standards for weights and measures.
Notable acts of this type include:
* Various Weights and Measures Acts (UK) or the various legislative ...
1985, an act that also abolished the official use of many other traditional units of measurement.
Use
![Milepost 358-6 on Yangon-Mandalay Expressway](https://upload.wikimedia.org/wikipedia/commons/b/b8/Milepost_358-6_on_Yangon-Mandalay_Expressway.JPG)
In
Myanmar
Myanmar, ; UK pronunciations: US pronunciations incl. . Note: Wikipedia's IPA conventions require indicating /r/ even in British English although only some British English speakers pronounce r at the end of syllables. As John C. Wells, Joh ...
, furlongs are currently used in conjunction with miles to indicate distances on highway signs. Mileposts on the
Yangon–Mandalay Expressway use miles and furlongs.
![036175 5 furlong](https://upload.wikimedia.org/wikipedia/commons/f/fb/036175_5_furlong.jpg)
In the rest of the world, the furlong has very limited use, with the notable exception of
horse racing
Horse racing is an equestrian performance sport, typically involving two or more horses ridden by jockeys (or sometimes driven without riders) over a set distance for competition. It is one of the most ancient of all sports, as its basic p ...
in most English-speaking countries, including
Canada
Canada is a country in North America. Its ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, covering over , making it the world's second-largest country by tot ...
and the
United States
The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territorie ...
. The distances for
horse racing
Horse racing is an equestrian performance sport, typically involving two or more horses ridden by jockeys (or sometimes driven without riders) over a set distance for competition. It is one of the most ancient of all sports, as its basic p ...
in Australia were converted to metric in 1972, but in the
United Kingdom
The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain, is a country in Europe, off the north-western coast of the continental mainland. It comprises England, Scotland, Wales and North ...
,
Ireland
Ireland ( ; ga, Éire ; Ulster Scots dialect, Ulster-Scots: ) is an island in the Atlantic Ocean, North Atlantic Ocean, in Northwestern Europe, north-western Europe. It is separated from Great Britain to its east by the North Channel (Grea ...
,
Canada
Canada is a country in North America. Its ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, covering over , making it the world's second-largest country by tot ...
, and the
United States
The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territorie ...
, races are still given in miles and furlongs. Also distances along the canals in English navigated by
narrowboats are commonly expressed in miles and furlongs.
The city of
Chicago's street numbering system allots a measure of 800 address units to each mile, in keeping with the city's system of eight blocks per mile. This means that every block in a typical Chicago neighborhood (in either north–south or east–west direction but rarely both) is approximately one furlong in length.
Salt Lake City
Salt Lake City (often shortened to Salt Lake and abbreviated as SLC) is the Capital (political), capital and List of cities and towns in Utah, most populous city of Utah, United States. It is the county seat, seat of Salt Lake County, Utah, Sal ...
's blocks are also each a square furlong in the downtown area. The blocks become less regular in shape farther from the center, but the numbering system (800 units to each mile) remains the same everywhere in
Salt Lake County
Salt Lake County is located in the U.S. state of Utah. As of the 2020 United States Census, the population was 1,185,238, making it the most populous county in Utah. Its county seat and largest city is Salt Lake City, the state capital. The cou ...
. Blocks in central
Logan, Utah, and in large sections of
Phoenix, Arizona
Phoenix ( ; nv, Hoozdo; es, Fénix or , yuf-x-wal, Banyà:nyuwá) is the List of capitals in the United States, capital and List of cities and towns in Arizona#List of cities and towns, most populous city of the U.S. state of Arizona, with 1 ...
, are similarly a square furlong in extent (eight to a mile, which explains the series of freeway exits: 19th Ave, 27th, 35th, 43rd, 51st, 59th ...). City blocks in the
Hoddle Grid
Hoddle Grid is the contemporary name given to the approximately grid of streets that form the Melbourne central business district, Australia. Bounded by Flinders Street, Spring Street, La Trobe Street, and Spencer Street, it lies at an an ...
of
Melbourne
Melbourne ( ; Boonwurrung/Woiwurrung: ''Narrm'' or ''Naarm'') is the capital and most populous city of the Australian state of Victoria, and the second-most populous city in both Australia and Oceania. Its name generally refers to a met ...
are also one furlong in length.
Much of
Ontario
Ontario ( ; ) is one of the thirteen provinces and territories of Canada.Ontario is located in the geographic eastern half of Canada, but it has historically and politically been considered to be part of Central Canada. Located in Central Ca ...
, Canada, was originally surveyed on a ten-furlong grid, with major roads being laid out along the grid lines. Now that distances are shown on road signs in kilometres, these major roads are almost exactly two kilometres apart. The exits on highways running through
Toronto
Toronto ( ; or ) is the capital city of the Canadian province of Ontario. With a recorded population of 2,794,356 in 2021, it is the most populous city in Canada and the fourth most populous city in North America. The city is the ancho ...
, for example, are generally at intervals of two kilometres.
The
Bangor City Forest
The Bangor City Forest also known as the Rolland F. Perry City Forest is a large recreation area in Bangor, Maine. The park consists of approximately and features close to of hiking, cycling, and cross-country skiing trails. The trail system is w ...
in Bangor, Maine has its trail system marked in miles and furlongs.
The furlong is also a base unit of the humorous
FFF system of units.
[ Stan Kelly-Bootle,]
As Big as a Barn?
, ''ACM Queue
''ACM Queue'' is a bimonthly computer magazine founded and published by the Association for Computing Machinery (ACM). The magazine was established in 2003. Steve Bourne
Stephen Richard "Steve" Bourne (born 7 January 1944) is an English comput ...
'', March 2007, pp. 62–64.
Definition of length
The exact length of the furlong varies slightly among English-speaking countries. In Canada and the United Kingdom, which define the furlong in terms of the international yard of exactly 0.9144 metres, a furlong is 201.168 m.
Australia does not formally define the furlong, but it does define the chain and link in terms of the international yard.
In the United States, which defines the furlong, chain, rod, and
link in terms of the
U.S. survey foot
The foot ( feet), standard symbol: ft, is a unit of length in the British imperial and United States customary systems of measurement. The prime symbol, , is a customarily used alternative symbol. Since the International Yard and ...
of exactly metre, a furlong is approximately 201.1684 m long. The United States does not formally define a "survey yard". The difference of approximately two parts per million between the U.S. value and the "international" value is insignificant for most practical measurements.
In October 2019,
U.S. National Geodetic Survey
The National Geodetic Survey (NGS) is a United States federal agency that defines and manages a national coordinate system, providing the foundation for transportation and communication; mapping and charting; and a large number of applications ...
and
National Institute of Standards and Technology
The National Institute of Standards and Technology (NIST) is an agency of the United States Department of Commerce whose mission is to promote American innovation and industrial competitiveness. NIST's activities are organized into physical sci ...
announced their joint intent to retire the U.S. survey foot, with effect from the end of 2022. The furlong in U.S. Customary units is thereafter defined based on the International 1959 foot, giving the length of the furlong as exact 201.168 meters in the United States as well.
See also
*
FFF system
*
Stadion (unit)
The stadion (plural stadia, grc-gre, ; Romanization, latinized as stadium), also anglicized as stade, list of obsolete units of measurement, was an ancient Greek units of measurement, ancient Greek unit of length, consisting of 600 Ancient Greek ...
References
{{United States Customary Units
Road transport in Myanmar
Customary units of measurement in the United States
Imperial units
Units of length
Surveying
Horse racing