Convert Mile to Furlong
Convert miles to furlongs instantly. 1 mile = 8 furlong — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Furlong to Mile converter for the reverse conversion.
Units explained
Mile
A mile (statute mile) is an Imperial and US customary unit of length equal to 5,280 feet or exactly 1,609.344 meters. It is the standard unit for road distances in the United States and the United Kingdom.
The mile derives from the Roman mille passus ("thousand paces" — about 1,480 meters). The English statute mile was fixed at 5,280 feet by the Weights and Measures Act of 1593, and exactly defined as 1,609.344 m by the 1959 International Yard and Pound Agreement.
Miles are used in the US and UK for road signs, speed limits (mph), athletic events (one-mile run), and geographic distances. Aviation also uses statute miles for some visibility measurements.
Roman origin (mille passus); English statute mile fixed at 5,280 feet in 1593; standardized to 1,609.344 m exactly by the 1959 International Yard and Pound Agreement.
Furlong
A furlong is an Imperial unit of length equal to 660 feet, or exactly one eighth of a mile (about 201.17 m). It is the longest unit in the traditional English farm-and-survey system.
The furlong derives from Old English furh (furrow) + lang (long) — originally the length of a furrow in a typical medieval English open field. Standardised at 660 feet (= 10 chains = 220 yards = 1/8 mile) in medieval times.
Furlongs are the standard distance unit in horse racing (e.g., 'The race is 8 furlongs'), historical English farming and surveying, and occasional poetic or rhetorical usage. Modern racing courses worldwide list distances in furlongs.
Medieval English farming origin; standardised at 660 feet; remains the official distance unit in flat-racing thoroughbred horse races worldwide.
Mile to Furlong conversion formula
The relationship between miles and furlongs:
To convert miles to furlongs, multiply the value in miles by 8. To reverse, multiply furlongs by 0.125.
How to use this converter
Type a value into the calculator. The result in furlongs updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Furlong to Mile converter for the reverse direction.
Step-by-step: convert miles to furlongs
- Write down the value in miles (mi).
- Multiply that value by the factor 8.
- The product is the equivalent value in furlongs (fur).
- To reverse, multiply the furlong value by 0.125.
Worked examples
Example 1 — Convert 1 mi to fur:
1 × 8 = 8 fur
Example 2 — Convert 100 mi to fur:
100 × 8 = 800 fur
Real-world example — Endurance race distances
A 50-mile cycling or running race converts to a recognizable distance in furlongs. Endurance athletes coming from a different measurement system use this conversion to compare training plans across regions.
50 mi × 8 = 400 fur
Real-world example — Maritime exclusion zone
A 200-mile exclusion zone (a common maritime boundary) converts to a different value in furlongs that's useful when describing the same zone in everyday land-distance units.
200 mi × 8 = 1600 fur
Real-world example — Coastal cruise distances
A 10-mile coastal sailing route converts to a different value in furlongs — useful for cruise operators who switch between maritime, aviation, and road-distance units depending on the leg of the trip.
10 mi × 8 = 80 fur
Mile to Furlong conversion table
Standard reference values for converting miles to furlongs:
| Mile [mi] | Furlong [fur] |
|---|---|
| 0.01 | 0.08 |
| 0.1 | 0.8 |
| 1 | 8 |
| 2 | 16 |
| 3 | 24 |
| 4 | 32 |
| 5 | 40 |
| 10 | 80 |
| 20 | 160 |
| 30 | 240 |
| 40 | 320 |
| 50 | 400 |
| 100 | 800 |
| 500 | 4000 |
| 1000 | 8000 |
Frequently asked questions
How many furlongs is 1 mile?
How do I convert miles to furlongs?
How do I convert furlongs back to miles?
How many furlongs is 100 miles?
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Sources & references
Conversion factor (1 mi = 8 fur) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Astronomical Union — System of Astronomical Constants
The IAU defines astronomical units including the AU (149597870700 m exactly) light-year and parsec used in astronomy and astrophysics.