1 nautical mile = 1.852 kilometres
A nautical mile is exactly 1.852 km, chosen so that one nautical mile equals one minute of latitude. That geometric link is why it has outlived every other traditional distance unit in professional use.
Formula km = nmi × 1.852
Type in either field — the other updates on every keystroke. Need other units? Open the full distance converter.
| Nautical mile | Kilometre |
|---|---|
| 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 |
| 10 nmi | 18.52 km |
| 15 nmi | 27.78 km |
| 20 nmi | 37.04 km |
| 25 nmi | 46.3 km |
| 50 nmi | 92.6 km |
| 100 nmi | 185.2 km |
| 500 nmi | 926 km |
| 1000 nmi | 1852 km |
| Kilometre | Nautical mile |
|---|---|
| 1 km | 0.539957 nmi |
| 2 km | 1.079914 nmi |
| 3 km | 1.61987 nmi |
| 4 km | 2.159827 nmi |
| 5 km | 2.699784 nmi |
| 10 km | 5.399568 nmi |
| 15 km | 8.099352 nmi |
| 20 km | 10.799136 nmi |
| 25 km | 13.49892 nmi |
| 50 km | 26.99784 nmi |
| 100 km | 53.99568 nmi |
| 500 km | 269.978402 nmi |
| 1000 km | 539.956803 nmi |
| Situation | From | To |
|---|---|---|
| One nautical mile | 1 nmi | 1.852 km |
| Harbour approach | 5 nmi | 9.26 km |
| Strait of Dover width | 18 nmi | 33.34 km |
| One degree of latitude | 60 nmi | 111.1 km |
| Offshore race leg | 500 nmi | 926 km |
| Exclusive economic zone limit | 200 nmi | 370.4 km |
Multiply by 1.85. 10 nmi is about 18.5 km, against an exact 18.52.
Charts, shipping and aviation use nautical miles. Coastal states claim a 12 nmi territorial sea (22.2 km) and a 200 nmi exclusive economic zone (370.4 km).
A nautical mile is not a statute mile: it is 1.852 km against 1.609 km. A knot is one nautical mile per hour.
The nautical mile began as one minute of arc of latitude. The 1929 International Extraordinary Hydrographic Conference standardised it at exactly 1,852 metres.