Convert Miles to Nautical Miles
1 mile (mi) equals 0.8689762419 nautical miles (nmi).
1 mi = 0.8689762419 nmi
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk mile to nautical mile converter to paste a column from Excel.
How to Convert Mile to Nautical Mile
- 1 mi = 0.8689762419 nmi
- 1 nmi = 1.150779448 mi
- Example: convert 15 mi to nmi: 15 mi = 15 × 0.8689762419 nmi = 13.03464363 nmi
Reference conditions. mi: The international yard and pound agreement (1959) fixed 1 yard = 0.9144 m exactly, so the inch, foot and mile are exact.
Formula
nmi = mi × 0.8689762419006
or nmi = mi ÷ 1.150779448024
Derivation from SI units:
- 1 mi = 5280 ft = 5280 × 0.3048 m = 1609.344 m
- 1 nmi = 1852 m (exact, by international agreement, 1929)
- 1 mi = 1609.344 m ÷ 1852 m per nmi = 0.8689762419006 nmi
Both units are defined exactly, so the factor is exact. Mile definition: mile; Nautical Mile definition: nautical mile.
Worked examples
- A reading of 3.1 mi converts to 2.69382635 nmi.
3.1 mi × 0.8689762419 = 2.69382635 nmi - A value of 26.2 mi is 22.76717754 nmi.
26.2 mi × 0.8689762419 = 22.76717754 nmi
Mile to Nautical Mile conversion table
| Miles (mi) | Nautical Miles (nmi) |
|---|---|
| 0.1 mi | 0.08689762419 nmi |
| 0.25 mi | 0.2172440605 nmi |
| 0.5 mi | 0.434488121 nmi |
| 1 mi | 0.8689762419 nmi |
| 2 mi | 1.737952484 nmi |
| 3 mi | 2.606928726 nmi |
| 3.1 mi | 2.69382635 nmi |
| 5 mi | 4.34488121 nmi |
| 6.2 mi | 5.3876527 nmi |
| 10 mi | 8.689762419 nmi |
| 13.1 mi | 11.38358877 nmi |
| 20 mi | 17.37952484 nmi |
| 26.2 mi | 22.76717754 nmi |
| 50 mi | 43.4488121 nmi |
| 60 mi | 52.13857451 nmi |
| 100 mi | 86.89762419 nmi |
| 200 mi | 173.7952484 nmi |
| 500 mi | 434.488121 nmi |
| 1000 mi | 868.9762419 nmi |
Where it's used
Miles are used for road distances and speed limits (mph) in the US and UK, while nautical miles appear in marine and air navigation. Both measure length and distance, so the conversion is a fixed factor.
Mile to other length units
| Conversion | 1 mi equals |
|---|---|
| mile to meter | 1609.344 m |
| mile to kilometer | 1.609344 km |
| mile to centimeter | 160934.4 cm |
| mile to millimeter | 1609344 mm |
| mile to micrometer | 1609344000 µm |
| mile to nanometer | 1609344000000 nm |
| mile to angstrom | 16093440000000 Å |
| mile to yard | 1760 yd |
| mile to foot | 5280 ft |
| mile to inch | 63360 in |
| mile to mil | 63360000 mil |
| mile to nautical mile | 0.8689762419 nmi |
Frequently asked questions
How many nautical miles are in 1 mile?
1 mi = 0.8689762419 nmi.
How do I convert miles to nautical miles?
Multiply the value in mi by 0.8689762419, or divide it by 1.150779448. For example, 15 mi × 0.8689762419 = 13.03464363 nmi.
Is the mi to nmi conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "mile (based on the international foot)".
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "nautical mile".
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Miles to Nautical Miles. Retrieved October 17, 2026, from https://scientificconverters.com/length/miles-to-nautical-miles/
IEEE
Scientific Converters, "Convert Miles to Nautical Miles," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/length/miles-to-nautical-miles/