Inches to Roman Miles (in to mp)

1 inch equals 0.00001716216216 Roman miles (rounded).

1 inch = 0.00001716216216 Roman miles

How to convert inches to Roman miles

To convert inches to Roman miles, multiply the number of inches by 0.00001716216216. The factor is rounded to 10 significant digits. To go the other way, multiply Roman miles by 58,267.71654 (rounded).

Roman miles = inches × 0.00001716216216

Example: 10 inches = 0.0001716216216 Roman miles.

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

About these units

Inch (in)

US & ImperialCurrent unit

1/12 of a foot. Defined as exactly 25.4 millimeters since 1959, when the US and Commonwealth countries agreed a common international inch.

Latin uncia, meaning one-twelfth, is the root of both inch and ounce, and it passed into Old English as ynce. Roman measurers divided their foot into twelve unciae, and the English inch kept that twelfth. After 1066 an inch was reckoned as three barleycorns, and a 1324 statute attributed to Edward II spelled out the definition as three grains of barley, dry and round, placed end to end lengthwise. For centuries the inch was simply a twelfth of a foot, or a thirty-sixth of a yard, and the US and UK each kept their own copy of the standard yard.

Those copies differed slightly until the 1959 international agreement fixed the yard at exactly 0.9144 meter, which made the inch exactly 25.4 millimeters. The US adopted it in 1959 and the UK ratified it in 1963, effective 1964. Today the inch is still the customary unit in the United States and Canada, and the UK keeps it on road signs. Worldwide it also names display diagonals, wheel rims, tire codes and pipe sizes.

1 inch = 0.0254 meters (exactly).

Sources: Wikipedia: Inch; Wikipedia: Yard; NIST Guide to the SI, Appendix B.8: conversion factors

Roman Mile (mp)

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

'A thousand paces' (mille passus): 5,000 Roman feet, about 1.48 km. The word 'mile' comes from it, and Roman roads were marked with milestones at this interval.

Latin speakers called it mille passus, a thousand paces, usually abbreviated m.p. A pace was counted each time the same foot struck the ground, so it spanned two steps and was reckoned at five Roman feet, which made the mile 5,000 feet. The English word mile descends from the shortened form of the Latin phrase, through Old English mil.

The length rests on the Roman foot, and that foot is not fixed precisely. Modern estimates of the mile cluster near 1,480 m, one empirical figure being about 1,479 m, and this is the figure used here. Marcus Agrippa's standard foot of around 29 BC is credited with indirectly standardizing it, but measured surviving feet vary by a few millimetres, which shifts the mile by metres.

Stone markers stood at every mile along the empire's paved roads, measured out from the Golden Milestone in the Forum. Eight Roman stadia made a mile, and in Greek-speaking provinces it was rendered as the milion. At roughly 0.92 of an international mile, it survives in the name of the modern mile, though later European miles drifted to very different lengths.

1 Roman mile = 1,480 meters (approximately).

Sources: Wikipedia: Roman mile; Wikipedia: Roman units of measurement

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