Stadia to Millimeters (stad to mm)

1 stadion equals 192,000 millimeters exactly.

1 stadion = 192,000 millimeters

How to convert stadia to millimeters

To convert stadia to millimeters, multiply the number of stadia by 192,000. This factor is exact. To go the other way, multiply millimeters by 0.000005208333333 (rounded).

millimeters = stadia × 192,000

Example: 10 stadia = 1,920,000 millimeters.

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

About these units

Stadion (stad)

Ancient GreekHistorical unit (no longer in standard use)Approximate value

The length of the footrace track at Olympia, about 192 m. Other Greek cities used slightly different stadia, from roughly 150 to 210 m.

From the Greek word stadion came the Latin stadium and the English stade, and eventually the stadium where athletes compete. It was the footrace track, and as a distance it was defined, according to Herodotus, as 600 Greek feet. Because the foot differed between cities, the stadion did too. The Olympic version is put at about 192 m, which one table describes as 200 Heracles steps, a proposal from Carl Lehmann-Haupt in 1929.

Estimates for other stadia show how loose the unit is. A figure near 185 m is the most common convergence for the Ptolemaic or Attic stadion, while Babylonian-Persian and Phoenician-Egyptian values reach about 196 and 209 m, and an itinerary stadion near 157 m has been argued for road distances. The overall range is roughly 150 to 210 m. The choice matters for judging Eratosthenes' measurement of the Earth. Eight stadia made a Roman mile, and the medieval stadium came to mean the furlong, about 201 m in modern terms.

1 stadion = 192 meters (approximately).

Sources: Wikipedia: Stadion (unit); Wikipedia: Ancient Greek units of measurement

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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