Miles to Ri (Japanese) (mi to ri)
1 mile equals 0.4097866667 ri (Japanese) (rounded).
How to convert miles to ri (Japanese)
To convert miles to ri (Japanese), multiply the number of miles by 0.4097866667. The factor is rounded to 10 significant digits. To go the other way, multiply ri (Japanese) by 2.440294137 (rounded).
ri (Japanese) = miles × 0.4097866667
Example: 10 miles = 4.097866667 ri (Japanese).
About these units
Mile (mi)
5,280 feet or 1,760 yards, exactly 1,609.344 meters. This is the statute (international) mile used on US and UK roads.
A thousand paces gave the mile its name. It descends from the Latin mille passus, the Roman mile, by way of Old English mil and Middle English myle. For centuries after Rome, miles of many lengths coexisted; a sixteenth-century Mercator map, for example, shows small, medium and large Flemish miles on a single scale bar. The English statute mile was fixed by an Act of Parliament under Elizabeth I in 1593, which declared that a mile contains eight furlongs, or 5,280 feet.
The 1959 international yard and pound agreement made that mile exactly 1,609.344 meters. A slightly longer US survey mile, about 1,609.347 meters, lingered in American land surveys and was slated for retirement from 1 January 2023. Today the mile is the road unit of the United Kingdom, the United States, Liberia and Myanmar, along with several territories such as the Bahamas, Belize, Guam and the US Virgin Islands. In Canada it survives chiefly in rail transport and horse racing.
1 mile = 1,609.344 meters (exactly).
Sources: Wikipedia: Mile; Wikipedia: Foot (unit); NIST Guide to the SI, Appendix B.8: conversion factors
Ri (Japanese) (ri)
36 chō, about 3.927 km. The traditional Japanese 'mile', roughly an hour's walk.
Ri comes from the Chinese li, written with characters said to combine field and earth, hinting at the span of a village. China's li has varied widely, from about 323 meters under the Tang to exactly 500 meters in the modern standard, so a bare reference to a ri is ambiguous without context.
Early Japanese practice used a ri of six cho, around 500 to 600 meters. Later it came to mean the distance a loaded porter could cover on a mountain road in an hour, which gave versions of 36, 40 and 48 cho. The Tokugawa shogunate fixed 36 cho, and the 1891 law adopted that count as 216/55 kilometer, about 3.927 kilometers or 2.44 miles.
Modern distances use kilometers, leaving the ri in proverbs and literature, where it suggests roughly an hour's walk. Because the length changed over time and by region, a distance quoted in ri from an old text should not be converted without knowing which ri was meant.
1 ri (Japanese) = 3,927.272727 meters (approximately).
Sources: Wikipedia: Ri (unit); Wikipedia: Japanese units of measurement; Japanese Wikipedia: Shakkanho (尺貫法)
Related conversions
- Ri (Japanese) to miles (reverse)
- Miles to meters
- Miles to kilometers
- Miles to centimeters
- Miles to millimeters
- Miles to inches
- Miles to feet
- Miles to yards
- Miles to micrometers
- Miles to nanometers
- Miles to nautical miles
- Miles to pixels (CSS)
- Miles to light-years
- Meters to ri (Japanese)
- Kilometers to ri (Japanese)
- Centimeters to ri (Japanese)
- Millimeters to ri (Japanese)
- Inches to ri (Japanese)
- Feet to ri (Japanese)
- Yards to ri (Japanese)
See all length units.