Lieues to Millimeters (lieue to mm)

1 lieue (Paris league) equals 3,898,072.62 millimeters (rounded).

1 lieue (Paris league) = 3,898,072.62 millimeters

How to convert lieues to millimeters

To convert lieues to millimeters, multiply the number of lieues by 3,898,072.62. The factor is rounded to 10 significant digits. To go the other way, multiply millimeters by 2.56537037×10⁻⁷ (rounded).

millimeters = lieues × 3,898,072.62

Example: 10 lieues = 38,980,726.2 millimeters.

About these units

Lieue (Paris League) (lieue)

French (Ancien Régime)Historical unit (no longer in standard use)

2,000 toises, about 3.898 km: the Paris league of 1674. The later post league (lieue de poste, 1737) was longer, at 2,200 toises or about 4.288 km.

Lieue descends from the Celtic league that the Romans adopted as the leuga. The Gallic version, about one and a half Roman miles, replaced the Roman mile as the official road distance in Gaul and Germania under Septimius Severus. In France the word later covered several different distances rather than one.

The figure used here, about 3,898 metres, is 2,000 toises, which Wikipedia's article on traditional French units calls the Paris league of 1674. The lieue de poste, which measured stages on the royal coach and mail routes, was set at 2,200 toises in 1737, about 4.288 kilometres. Wikipedia's league article lists the post league at the shorter 3,898 metres, so its two articles disagree about which league carried that name.

Other French leagues ranged from 10,000 to 14,400 pieds, or roughly 3.25 to 4.68 kilometres. The metric lieue of exactly 4,000 metres was used in the customary system between 1812 and 1840. Since the unit was never standardized, any conversion to kilometres should name which lieue is meant.

1 lieue (Paris league) = 3,898.07262 meters (approximately).

Sources: Wikipedia: League (unit); Wikipedia: Traditional French units of measurement; Wikipedia: Toise

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

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