A nautical mile is exactly 1,852 meters.
Nautical miles to Furlongs Converter — nmi to fur
Convert Nautical mile (nmi) to Furlong (fur) using the exact conversion factor (1 nautical mile = 9.206235584 furlong). See the formula, worked examples, conversion table, history, and common uses.
Nautical miles to Furlongs 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 furlong is 660 feet.
Result = input x 1852 / 201.168.
Length uses the meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Nautical miles to Furlongs
Nautical mile and Furlong both measure length. Nautical mile is most often used for marine and aviation distance and navigation.
Formula
furlongs = nautical miles × 9.20623558419
This factor comes from each unit's defined relationship to the category's base unit: 1 nautical mile equals 1852 base units, and 1 furlong equals 201.168 base units, so dividing one by the other gives the direct nautical mile-to-furlong factor of 9.20623558419.
Simple example
1 nmi × 9.206235584 = 9.206235584 fur
1 nautical mile = 9.206235584 furlongs.
Real-world example
10 nmi × 9.206235584 = 92.06235584 fur
10 nautical miles = 92.06235584 furlongs.
Conversion table
| Nautical mile (nmi) | Furlong (fur) |
|---|---|
| 1 nmi | 9.206235584 fur |
| 5 nmi | 46.03117792 fur |
| 10 nmi | 92.06235584 fur |
| 21.0975 nmi | 194.2285552 fur |
| 42.195 nmi | 388.4571105 fur |
| 100 nmi | 920.6235584 fur |
Reverse conversion: Furlong to Nautical mile
9.206235584 fur × 0.1086220302 = 1 nmi
9.206235584 furlongs = 1 nautical miles.
nautical miles = furlongs × 0.108622030238
For a page dedicated to this direction, see Furlong to Nautical mile.
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.
Understanding the Furlong (fur)
A furlong is 660 feet.
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 furlongs are in 1 nautical mile?
1 nautical mile equals 9.206235584 furlongs, using the exact defined conversion factor rather than an estimate.
How do I convert nautical mile to furlong?
Multiply the nautical mile value by 9.206235584. The converter above does this instantly to whatever precision you set.
How do I convert furlong back to nautical mile?
Use the reverse factor: 1 furlong equals 0.1086220302 nautical miles. You can also use the swap control in the converter above to flip the direction instantly.
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).
What is a furlong?
Furlong (fur) is a unit of length.
Is the nautical mile to furlong 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.
Where is the nautical mile still used today?
Used internationally in maritime navigation and aviation.