Nautical miles to kilometers
1 nautical mile = 1.852 kilometers
Type a value in nautical miles (nmi) to get kilometers (km) straight away. A nautical mile is larger than a kilometer, so the number goes up. Both units belong to length, measured here against the meter.
1 nmi = 1.852 km
Formula
km = nmi × 1.852
One nautical mile is 1.852 kilometers, so multiply the nautical mile value by that factor. Here nmi is the value in nautical miles and km is the result in kilometers.
Worked example: 10 nautical miles × 1.852 = 18.52 kilometers.
Nautical miles to kilometers table
| nautical miles (nmi) | kilometers (km) |
|---|---|
| 1 nmi | 1.852 km |
| 2 nmi | 3.704 km |
| 3 nmi | 5.556 km |
| 4 nmi | 7.408 km |
| 5 nmi | 9.26 km |
| 6 nmi | 11.112 km |
| 7 nmi | 12.964 km |
| 8 nmi | 14.816 km |
| 9 nmi | 16.668 km |
| 10 nmi | 18.52 km |
| 15 nmi | 27.78 km |
| 20 nmi | 37.04 km |
| 25 nmi | 46.3 km |
| 30 nmi | 55.56 km |
| 40 nmi | 74.08 km |
| 50 nmi | 92.6 km |
| 60 nmi | 111.12 km |
| 75 nmi | 138.9 km |
| 100 nmi | 185.2 km |
Everyday nautical miles in kilometers
| What it is | nmi | km |
|---|---|---|
| one minute of latitude | 1 nmi | 1.852 km |
| a common near-coast limit | 3 nmi | 5.556 km |
| the territorial sea limit | 12 nmi | 22.224 km |
| the contiguous zone limit | 24 nmi | 44.448 km |
| an exclusive economic zone | 200 nmi | 370.4 km |
Quick estimate in your head
Multiply by about 1.9. For 10 nmi that gives 19 km against an exact 18.52 km, an error of 2.6%.
Watch out for
- A nautical mile (1,852 m) is about 15% longer than a statute mile (1,609 m).
About the units
Nautical mile (nmi). Exactly 1,852 m, about one minute of latitude. Used in sea and air navigation.
Kilometer (km). 1,000 meters. Used for road distances and running races outside the US and UK.
Going the other way, 1 kilometer is 0.539957 nautical miles.
Questions
How many kilometers are in 1 nautical mile?
1 nautical mile is 1.852 kilometers, and 1 kilometer is 0.539957 nautical miles.
How do I convert nautical miles to kilometers?
Use km = nmi × 1.852. For example, 10 nautical miles × 1.852 = 18.52 kilometers.
Is the nautical mile to kilometer factor exact?
The factor comes from the unit definitions. Results here are rounded to 6 significant digits for display.
How much is an exclusive economic zone in kilometers?
200 nmi is 370.4 km.
Source for the conversion factor: NIST SP 811, Appendix B (conversion factors).
Related conversions
- kilometers to nautical miles
- kilometers to miles
- miles to kilometers
- kilometers to meters
- meters to kilometers
- nautical miles to miles