A furlong is 660 feet.
Furlongs to Nautical miles Converter — fur to nmi
Convert Furlong (fur) to Nautical mile (nmi) using the exact conversion factor (1 furlong = 0.1086220302 nautical mile). See the formula, worked examples, conversion table, history, and common uses.
Furlongs to Nautical miles converter
Converter
Length Converter
Convert SI, imperial, US customary, astronomical, scientific, and historical length units.
Context values
Some unit families need one extra value for a physically accurate result.
A nautical mile is exactly 1,852 meters.
Result = input x 201.168 / 1852.
Length uses the meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Furlongs to Nautical miles
Furlong and Nautical mile both measure length. Specifically: A furlong is 660 feet, and a nautical mile is exactly 1,852 meters.
Formula
nautical miles = furlongs × 0.108622030238
This factor comes from each unit's defined relationship to the category's base unit: 1 furlong equals 201.168 base units, and 1 nautical mile equals 1852 base units, so dividing one by the other gives the direct furlong-to-nautical mile factor of 0.108622030238.
Simple example
1 fur × 0.1086220302 = 0.1086220302 nmi
1 furlong = 0.1086220302 nautical miles.
Real-world example
10 fur × 0.1086220302 = 1.086220302 nmi
10 furlongs = 1.086220302 nautical miles.
Conversion table
| Furlong (fur) | Nautical mile (nmi) |
|---|---|
| 1 fur | 0.1086220302 nmi |
| 5 fur | 0.5431101512 nmi |
| 10 fur | 1.086220302 nmi |
| 21.0975 fur | 2.291653283 nmi |
| 42.195 fur | 4.583306566 nmi |
| 100 fur | 10.86220302 nmi |
Reverse conversion: Nautical mile to Furlong
0.1086220302 nmi × 9.206235584 = 0.9999999997 fur
0.1086220302 nautical miles = 0.9999999997 furlongs.
furlongs = nautical miles × 9.20623558419
For a page dedicated to this direction, see Nautical mile to Furlong.
Understanding the Furlong (fur)
A furlong is 660 feet.
Understanding the Nautical mile
Nautical mile (nmi) measures distance. The international nautical mile is defined as exactly 1,852 meters, standardized in 1929. It is classified as a Non-SI unit accepted for use with SI (maritime/aviation).
Where it's used: Used internationally in maritime navigation and aviation.
Uses of the Nautical mile today
- Marine and aviation distance and navigation
- Basis for the knot (nautical miles per hour)
History of the Nautical mile
The nautical mile was historically defined as one minute of latitude along a meridian, directly tying sea navigation to the Earth's geometry, which made it practical for chart-based navigation using a ship's known latitude. The International Hydrographic Bureau standardized it at exactly 1,852 meters in 1929, a value close to the traditional latitude-based definitions used by different countries.
Historical origin. Nautical mile was not the invention of a single named person; it developed through the process described above.
Nautical mile — sources
- BIPM SI Brochure — Non-SI units accepted for use with SI — Lists the nautical mile among accepted non-SI units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many nautical miles are in 1 furlong?
1 furlong equals 0.1086220302 nautical miles, using the exact defined conversion factor rather than an estimate.
How do I convert furlong to nautical mile?
Multiply the furlong value by 0.1086220302. The converter above does this instantly to whatever precision you set.
How do I convert nautical mile back to furlong?
Use the reverse factor: 1 nautical mile equals 9.206235584 furlongs. You can also use the swap control in the converter above to flip the direction instantly.
What is a furlong?
Furlong (fur) is a unit of length.
What is a nautical mile?
Nautical mile (nmi) measures distance. The international nautical mile is defined as exactly 1,852 meters, standardized in 1929. It is classified as a Non-SI unit accepted for use with SI (maritime/aviation).
Is the furlong to nautical mile conversion exact?
Yes. The international nautical mile is defined as exactly 1,852 meters, standardized in 1929. That fixed definition is what the converter above uses, so any rounding you see is a display choice, not a limitation of the math.