Kilometers to nautical miles
Type a value in kilometers to see it in nautical miles straight away, or type in the second box to convert back.
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Processing and privacy: The result is calculated inside your browser and your data is not sent to any server.
How to use it
- Type the value in the kilometers box.
- Read the result in nautical miles as you type, and pick the precision you need.
- Swap the direction to convert back, or copy the result.
How it is calculated
nmi = km × 0.5399568035
Multiply the value in kilometers by 0.5399568035 to get nautical miles.
Example
To convert 25 km to nautical miles: 25 × 0.5399568035 = 13.4989 nmi.
Conversion table
| Kilometers (km) | Nautical miles (nmi) |
|---|---|
| 1 | 0.539957 |
| 2 | 1.07991 |
| 3 | 1.61987 |
| 5 | 2.69978 |
| 10 | 5.39957 |
| 20 | 10.7991 |
| 25 | 13.4989 |
| 50 | 26.9978 |
| 100 | 53.9957 |
| 250 | 134.989 |
| 500 | 269.978 |
| 1,000 | 539.957 |
About the units
- Kilometer
- A kilometer is exactly 1000 meters and is the usual unit for road and travel distances.
- Nautical mile
- The international nautical mile is exactly 1852 meters, used in sea and air navigation.
Limits and caveats
- Results are rounded for display and computed with the browser's floating point precision (about 15 significant digits).
- Both unit factors are exact by their official definitions.
Questions about this tool
How many nautical miles are in one kilometer?
1 km = 0.539957 nmi exactly.
How do I convert kilometers to nautical miles?
Use nmi = km × 0.5399568035. For example, 25 km = 13.4989 nmi.
How many kilometers are in one nautical mile?
1 nmi = 1.852 km.
Are the inch, foot and mile factors exact or rounded?
They are exact by definition. Since the 1959 agreement one inch is exactly 2.54 cm, one foot 0.3048 m and one mile 1609.344 m.
What is the difference between a mile and a nautical mile?
A statute mile is 1609.344 meters and is used on roads. A nautical mile is 1852 meters and is used at sea and in aviation.