Furlong Converter
Convert furlongs to meters, miles, kilometers, yards, and other length units. Includes horse racing distance references and historical unit conversions.
Furlong Converter
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Formula: 1 Furlong = 201.168 meters = 220 yards = 660 feet = 1/8 mile
Worked example โ 10 furlongs = 2,011.68 m = 2.012 km = 1.25 miles = 2,200 yards
Formula
1 Furlong = 201.168 meters = 220 yards = 660 feet = 1/8 mile
The furlong is defined as exactly 201.168 meters through the international yard agreement. All conversions pass through meters as the base unit. One furlong equals 10 chains, 40 rods, or 1/8 of a statute mile.
Worked Examples
Example 1: Kentucky Derby Distance Conversion
Problem:The Kentucky Derby is run over 10 furlongs. Convert this to meters, kilometers, miles, and yards.
Solution:10 furlongs x 201.168 m/furlong = 2,011.68 meters 2,011.68 / 1,000 = 2.01168 kilometers 10 furlongs / 8 furlongs per mile = 1.25 miles 10 furlongs x 220 yards/furlong = 2,200 yards 10 furlongs x 660 feet/furlong = 6,600 feet
Result:10 furlongs = 2,011.68 m = 2.012 km = 1.25 miles = 2,200 yards
Example 2: Marathon to Furlongs
Problem:A marathon is 42,195 meters. How many furlongs is that?
Solution:42,195 meters / 201.168 meters per furlong = 209.714 furlongs Or: 42,195 / 1609.344 = 26.2188 miles 26.2188 x 8 = 209.75 furlongs Closest whole furlongs = 210 furlongs 210 furlongs = 42,245.28 meters (50 meters more than a marathon)
Result:Marathon = 209.71 furlongs = approximately 210 furlongs
Frequently Asked Questions
What is a furlong and where did the measurement originate?
A furlong is a unit of length equal to one-eighth of a mile, 220 yards, 660 feet, or exactly 201.168 meters. The word comes from the Old English words 'furh' meaning furrow and 'lang' meaning long. It originally represented the length of a furrow that a team of oxen could plow in a medieval open field before needing to turn. This standardized plot was approximately 40 rods or 10 chains long. The furlong became an official English unit of measurement and was incorporated into the statute mile in 1593 when Queen Elizabeth I defined the mile as 8 furlongs. Today the furlong survives primarily in horse racing where track distances are still commonly expressed in furlongs throughout the United Kingdom, United States, and other countries with thoroughbred racing traditions.
Why are furlongs still used in horse racing today?
Furlongs remain the standard unit for horse racing distances because the sport has deep historical roots in British tradition dating back centuries. Race distances were originally measured across open fields where the furlong was a natural measurement unit. The convention persisted as formal racetracks were established, and changing to metric measurements would disrupt the entire historical record of race times, track records, and handicapping data. In the United States, the Kentucky Derby is famously 10 furlongs or 1 and 1/4 miles. Sprints are typically 5 to 7 furlongs while distance races range from 8 to 16 furlongs. Furlong markers called poles are placed around the track, with the quarter pole being 2 furlongs from the finish and the half-mile pole at 4 furlongs. This tradition shows no signs of changing despite metric conversion in most other domains.
How does a furlong relate to other imperial and historical measurements?
The furlong sits within a coherent system of related imperial measurements based on land surveying. One furlong equals 10 chains, where each chain is 66 feet as defined by Edmund Gunter in 1620. One furlong also equals 40 rods or poles, where each rod is 16.5 feet. Eight furlongs make one statute mile of 5,280 feet. A square furlong, which is one furlong by one furlong, equals 10 acres, creating a direct link between linear and area measurements. This relationship was fundamental to medieval English land management where a strip of farmland was typically 1 furlong long by 1 chain wide, equaling exactly 1 acre. The chain became the basis of the American Public Land Survey System that divided much of the United States into sections and townships.
How do you convert between furlongs and metric units?
Converting furlongs to metric units uses the exact conversion factor of 1 furlong equaling 201.168 meters. To convert furlongs to meters, multiply by 201.168. To convert furlongs to kilometers, multiply by 0.201168. To go from meters to furlongs, divide by 201.168. For quick mental estimates, 1 furlong is approximately 200 meters or one-fifth of a kilometer. Five furlongs is almost exactly 1 kilometer with only about 6 meters difference. This makes the 5-to-1 ratio useful for quick approximations. For precise scientific or engineering work, use the exact value since the furlong is defined through the international yard agreement of 1959 where 1 yard equals exactly 0.9144 meters, making 1 furlong exactly 201.168 meters with no rounding involved.
What other unusual or archaic length units are related to the furlong?
The furlong connects to a fascinating family of historical length units. The chain at 66 feet was the standard surveying unit used with Gunter's chain, a physical chain of 100 links. The rod, pole, or perch at 16.5 feet was the standard unit for measuring agricultural land and is still used in some US property descriptions. The ell was approximately 45 inches and used in textile measurement. The league, roughly 3 miles or 24 furlongs, was the distance a person could walk in one hour. The fathom at 6 feet measured water depth. The hand at 4 inches still measures horse height. The cable at 100 fathoms or 600 feet measured nautical distances. Many of these units persisted because they related to practical human-scale activities like plowing, walking, or measuring cloth, making them more intuitive than abstract metric units in their original contexts.
How many furlongs are in a mile, and why is the number eight?
One statute mile contains exactly 8 furlongs, because a furlong is 660 feet and a mile is 5,280 feet. The furlong descends from the Old English furh-lang, the length of a plowed furrow in a medieval open field, standardised at 40 rods of 16.5 feet each. When the mile was fixed at 1,760 yards by statute, the value was chosen so it divided evenly into whole furlongs rather than following the older Roman mile of about 5,000 feet. That is why race distances convert so cleanly: 4 furlongs is half a mile and 12 furlongs is a mile and a half.
How does the furlong relate to the chain, the rod and the acre?
These units form one interlocking surveying system. A link is 0.66 feet, 100 links make a chain of 66 feet, 10 chains make a furlong of 660 feet, and 80 chains make a mile. A rod, also called a pole or perch, is 16.5 feet, so 4 rods equal a chain and 40 rods equal a furlong. The acre was originally the area of a strip one chain wide by one furlong long, that is 66 by 660 feet, or 43,560 square feet. Gunter's chain made this arithmetic practical in the field, and it still underlies US Public Land Survey descriptions.
How do you turn a horse racing time per furlong into miles per hour?
A furlong is exactly one-eighth of a mile, or 0.125 miles, so speed in miles per hour equals 0.125 divided by the furlong time expressed in hours. A horse covering a furlong in 12 seconds is running 0.125 / (12/3600) = 37.5 mph. At 13 seconds per furlong the figure falls to about 34.6 mph. In metric terms, 201.168 metres in 12 seconds is 16.76 metres per second. Sectional times per furlong are how trainers judge whether a horse is quickening or fading, since an even-paced gallop shows near-constant furlong splits.
How does a furlong compare with a nautical mile, and why are the two rarely mixed?
One nautical mile is 1,852 metres by international definition, which is 1852 / 201.168 = 9.2064 furlongs. The furlong grew out of land measurement tied to plowing and field boundaries, while the nautical mile was defined from the Earth itself as one arcminute of latitude, so a degree of latitude spans 60 nautical miles. Because chart work depends on that direct link between distance and angle, mariners never adopted the furlong. The two survive in separate worlds: furlongs on turf and in old deeds, nautical miles at sea and in the air.
Does the US survey foot change furlong conversions?
Only at the parts-per-million level. The international foot is exactly 0.3048 metres, giving a furlong of exactly 201.168 metres. The older US survey foot was defined as 1200/3937 metres, about 2 parts per million longer, so a survey furlong works out to roughly 201.16840 metres, a difference of about 0.4 millimetres per furlong. That is irrelevant for racing but can matter across long survey traverses, where the discrepancy accumulates to a few centimetres per hundred kilometres. The US survey foot has been phased out in favour of the international foot, so modern work should use 201.168 metres.
References
Reviewed for accuracy by Manoj Kumar, Mathematics Educator ยท Editorial policy
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