Convert Nautical Miles to Kilometers
1 nautical mile (nmi) equals 1.852 kilometers (km).
1 nmi = 1.852 km
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk nautical mile to kilometer converter to paste a column from Excel.
How to Convert Nautical Mile to Kilometer
- 1 nmi = 1.852 km
- 1 km = 0.5399568035 nmi
- Example: convert 15 nmi to km: 15 nmi = 15 × 1.852 km = 27.78 km
Formula
km = nmi × 1.852
Derivation from SI units:
- 1 nmi = 1852 m (exact, by international agreement, 1929)
- 1 km = 10³ m
- 1 nmi = 1852 m ÷ 1000 m per km = 1.852 km
Both units are defined exactly, so the factor is exact. Nautical Mile definition: nautical mile; Kilometer definition: kilometer.
Worked examples
- Territorial waters extend 12 nmi from the coast, which is 22.224 km.
12 nmi × 1.852 = 22.224 km - An exclusive economic zone of 200 nmi is 370.4 km.
200 nmi × 1.852 = 370.4 km
Nautical Mile to Kilometer conversion table
| Nautical Miles (nmi) | Kilometers (km) |
|---|---|
| 0.5 nmi | 0.926 km |
| 1 nmi | 1.852 km |
| 2 nmi | 3.704 km |
| 3 nmi | 5.556 km |
| 5 nmi | 9.26 km |
| 10 nmi | 18.52 km |
| 12 nmi | 22.224 km |
| 20 nmi | 37.04 km |
| 50 nmi | 92.6 km |
| 100 nmi | 185.2 km |
| 200 nmi | 370.4 km |
| 500 nmi | 926 km |
| 1000 nmi | 1852 km |
| 3000 nmi | 5556 km |
Where it's used
Marine and aviation distances in nautical miles are converted to kilometres for maps and international reports. Multiply by exactly 1.852.
Nautical Mile to other length units
| Conversion | 1 nmi equals |
|---|---|
| nautical mile to meter | 1852 m |
| nautical mile to kilometer | 1.852 km |
| nautical mile to centimeter | 185200 cm |
| nautical mile to millimeter | 1852000 mm |
| nautical mile to micrometer | 1852000000 µm |
| nautical mile to nanometer | 1852000000000 nm |
| nautical mile to angstrom | 18520000000000 Å |
| nautical mile to mile | 1.150779448 mi |
| nautical mile to yard | 2025.371829 yd |
| nautical mile to foot | 6076.115486 ft |
| nautical mile to inch | 72913.38583 in |
| nautical mile to mil | 72913385.83 mil |
Frequently asked questions
Why is a nautical mile 1852 m?
It approximates one minute of latitude on the Earth; the value 1852 m was fixed by international agreement in 1929.
How many kilometers are in 1 nautical mile?
1 nmi = 1.852 km.
How do I convert nautical miles to kilometers?
Multiply the value in nmi by 1.852. For example, 15 nmi × 1.852 = 27.78 km.
Is the nmi to km conversion exact?
Yes. Both units are defined exactly, and 1 nmi is exactly 1.852 km.
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, "nautical mile".
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 7, SI prefixes.
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 Nautical Miles to Kilometers. Retrieved October 17, 2026, from https://scientificconverters.com/length/nautical-miles-to-kilometers/
IEEE
Scientific Converters, "Convert Nautical Miles to Kilometers," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/length/nautical-miles-to-kilometers/