Furlongs to Millimeters (fur to mm)

1 furlong equals 201,168 millimeters exactly.

1 furlong = 201,168 millimeters

How to convert furlongs to millimeters

To convert furlongs to millimeters, multiply the number of furlongs by 201,168. This factor is exact. To go the other way, multiply millimeters by 0.000004970969538 (rounded).

millimeters = furlongs × 201,168

Example: 10 furlongs = 2,011,680 millimeters.

About these units

Furlong (fur)

US & ImperialTraditional unit (still used in some regions)

220 yards, one eighth of a mile (201.168 m). Still used to measure horse races in the UK, US and Ireland.

Furrow plus long gives furlong, from the Old English furh and lang. A field strip one furlong in length was how far a team of oxen was thought to plough before pausing. The furlong has also long been treated as the equivalent of the Roman stadium, an ancient unit of similar size.

Its size was fixed against other units: 40 rods, 10 chains, 220 yards or 660 feet, which equals exactly 201.168 m. An acre was defined as one furlong long by one chain wide, so ten acres make a square furlong. When England shortened the foot in the late thirteenth century the furlong grew from 600 old feet to 660 new ones, keeping its length in rods. Eight furlongs make a mile. Official use ended in the UK under the Weights and Measures Act 1985, but racecourses, farms and canal signs still count in furlongs.

1 furlong = 201.168 meters (exactly).

Sources: Wikipedia: Furlong; Wikipedia: Chain (unit)

Millimeter (mm)

Metric (SI)Current unit

One thousandth of a meter. Used in engineering, manufacturing and rainfall measurement.

Carl Friedrich Gauss put the millimeter at the base of his 1832 proposal for absolute units, pairing it with the milligram and the second, although the centimeter-based CGS system later won out among scientists. The name combines the metric prefix milli-, from the Latin for one thousand, with the meter. Since 1983 a millimeter has been tied to the speed of light: it is the distance light covers in 1/299,792,458,000 of a second.

Millimeters are the language of fine mechanical work. Standard rulers are divided into them, digital calipers commonly read to 0.01 mm, and mechanical pencil leads come in 0.5 and 0.7 mm. Copy paper is about 0.1 mm thick, and a thin hair, at 0.02 to 0.04 mm across, is close to the smallest thing the naked eye can see. A wave with a frequency of 300 GHz has a wavelength of 1 mm. An inch is exactly 25.4 mm. One trap for readers in the United States is that mil there traditionally means a thousandth of an inch, not a millimeter.

1 millimeter = 0.001 meters (exactly).

Sources: Wikipedia: Millimetre; Wikipedia: Centimetre-gram-second system of units; NIST Guide to the SI, Appendix B.8: conversion factors

Related conversions

See all length units.