How to convert kilometers to nautical miles
- Take the value in kilometers.
- Use the formula nautical miles = kilometers ÷ 1.852.
- For example, 1 km is 0.54 nmi.
About kilometers and nautical miles
Divide kilometers by 1.852 to get nautical miles. One kilometer is 0.54 nautical miles, so halving the kilometers and adding 8% gives a close estimate: 100 km becomes 54 nmi.
Road maps, weather apps and ferry timetables often give distances in kilometers, while sea charts, aviation charts and boat instruments work in nautical miles. Planning a passage or a flight from a metric map needs this conversion.
Examples
- 1 km (one kilometer) is 0.54 nmi
- 1.85 km (one nautical mile) is 1 nmi
- 33 km (about the width of the Strait of Dover) is 17.82 nmi
- 40,075 km (the Earth’s circumference at the equator) is 21,638.77 nmi
Kilometers to nautical miles chart
| Kilometers (km) | Nautical miles (nmi) |
|---|---|
| 0.5 | 0.27 |
| 1 | 0.54 |
| 1.85 | 1 |
| 2 | 1.08 |
| 5 | 2.7 |
| 10 | 5.4 |
| 15 | 8.1 |
| 20 | 10.8 |
| 25 | 13.5 |
| 30 | 16.2 |
| 40 | 21.6 |
| 50 | 27 |
| Kilometers (km) | Nautical miles (nmi) |
|---|---|
| 75 | 40.5 |
| 100 | 54 |
| 150 | 80.99 |
| 200 | 107.99 |
| 250 | 134.99 |
| 300 | 161.99 |
| 370.4 | 200 |
| 500 | 269.98 |
| 1,000 | 539.96 |
| 2,000 | 1,079.91 |
| 5,000 | 2,699.78 |
| 10,000 | 5,399.57 |