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Furlong
Unit system Imperial/US
Unit of length
Unit conversions
1 furlong in ... ... is equal to ...
SI units 201.168 m
Imperial/US unit(s) 220 yd

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Metric Conversion
Kilometre [km]
Hectometre [hm]
Decametre [dam]
Metre [m]
Decimetre [dm]
Centimetre [cm]
Millimetre [mm]
Micrometre [µm]
Nanometre [nm]
Angstrom [Å]
British/Imperial Conversion
League
Mile [mi]
Furlong
Chain
Rod [rd]
Yard [yd]
Foot [ft]
Link
Hand
Inch [in]
Line
Mil [mil]
Thou [thou]
Nautical Conversion
Sea mile
Fathom
Astronomical Conversion
Parsec [pc]
Light Year
Astronomical Unit [AE]
Light Minute
Light Second

A furlong is a measure of distance in imperial units and U.S. customary units equal to one-eighth of a mile, equivalent to 660 feet, 220 yards, 40 rods, or 10 chains.

Using the international definition of the inch as exactly 25.4 millimetres, one furlong is 201.168 metres. However, the United States does not uniformly use this conversion ratio.

Older ratios are in use for surveying purposes in some states, leading to variations in the length of the furlong of about two parts per million, or 0.4 millimetres (1/64 inch). This variation is too small to have many practical consequences. Five furlongs are about 1.0 kilometre (1.00584 km is the exact value, according to the international conversion).

This article uses material from the Wikipedia article "Furlong", which is released under the Creative Commons Attribution-Share-Alike License 3.0.