Leguas to Millimeters (legua to mm)

1 legua (Castilian) equals 5,572,666.667 millimeters (rounded).

1 legua (Castilian) = 5,572,666.667 millimeters

How to convert leguas to millimeters

To convert leguas to millimeters, multiply the number of leguas by 5,572,666.667. The factor is rounded to 10 significant digits. To go the other way, multiply millimeters by 1.794473023×10⁻⁷ (rounded).

millimeters = leguas × 5,572,666.667

Example: 10 leguas = 55,726,666.67 millimeters.

Approximate value. Standards for the legua (Castilian) varied by place and period, so this converter uses the most commonly cited value. Treat results as estimates, not exact figures.

About these units

Legua (Castilian) (legua)

Spanish & PortugueseHistorical unit (no longer in standard use)Approximate value

About 5.57 km, equal to 6,666⅔ varas. The standard Spanish league; Portugal and Latin America used different values.

Spanish legua is a descendant of the Roman leuga, itself taken from an older Celtic distance used in Gaul. In medieval Castile it was reckoned as three Spanish miles, so its real length depended on the local foot and on how carefully a road was paced out. A decree of Philip II in 1568 abolished the older legal league of roughly 4.18 km and set the league at about 5.57 km, the figure used here.

That league was fixed at 20,000 Castilian feet, which the Spanish law of 1801 later expressed as 6,666 and two thirds varas. It served for overland travel, for describing the extent of colonial land grants, and, as a square league, for ranch and estate areas in Texas and Mexico. Spanish America never agreed on one value: Mexico used a league of 5,000 varas near 4.19 km, Chile about 4.51 km, and Buenos Aires about 5.15 km.

A later legua nueva of 8,000 varas, close to 6.69 km, was also defined in 1766. Today a Castilian legua is a little under three and a half modern statute miles, and the word survives in place names and in loose speech for a walking hour.

1 legua (Castilian) = 5,572.666667 meters (approximately).

Sources: Wikipedia: League (unit); Wikipedia: Spanish customary units; Wikipedia: Vara (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

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