Home › Unit Conversion › Kilometers to Nautical miles
Kilometers to Nautical miles (km to nmi)
Convert kilometers to nautical miles: 1 km = 0.539957 nmi. Exact conversion factor, formula, 22-row table and worked examples, with JSON API and MCP access.
Formula
1 km = 0.539957 nmi
nautical miles = kilometers × 0.5399568035 — reverse: kilometers = nautical miles × 1.852
The factor is derived from the SI definitions of both units (base unit: m) as listed in NIST SP 811; results on this page are shown to 6 significant figures, the API returns up to 12.
Worked examples
- 5 km = 2.69978 nmi
- 12.5 km = 6.74946 nmi
- 100 km = 53.9957 nmi
Kilometers to nautical miles conversion table
| Kilometers (km) | Nautical miles (nmi) |
|---|---|
| 1 | 0.539957 |
| 2 | 1.07991 |
| 3 | 1.61987 |
| 4 | 2.15983 |
| 5 | 2.69978 |
| 6 | 3.23974 |
| 7 | 3.7797 |
| 8 | 4.31965 |
| 9 | 4.85961 |
| 10 | 5.39957 |
| 15 | 8.09935 |
| 20 | 10.7991 |
| 25 | 13.4989 |
| 30 | 16.1987 |
| 40 | 21.5983 |
| 50 | 26.9978 |
| 75 | 40.4968 |
| 100 | 53.9957 |
| 200 | 107.991 |
| 250 | 134.989 |
| 500 | 269.978 |
| 1000 | 539.957 |
FAQ
How many nautical miles are in one kilometer?
1 km = 0.539957 nmi. The factor comes from the SI definitions of both units (NIST SP 811 / BIPM), so it is exact or correct to at least 10 significant figures.
What is the formula to convert kilometers to nautical miles?
Multiply the value in kilometers by 0.5399568035: nautical miles = kilometers × 0.5399568035. For example, 5 km = 2.69978 nmi.
How do I convert nautical miles back to kilometers?
Multiply by the inverse factor 1.852 (kilometers = nautical miles × 1.852), or use the nautical miles-to-kilometers page.
Related conversions
Machine access
- API:
GET https://tttkmbb.com/api/v1/convert?value=5&from_unit=km&to_unit=nmi - MCP: server
https://tttkmbb.com/mcp, toolconvert_unitswith{"value":5,"from_unit":"km","to_unit":"nmi"} - Markdown: https://tttkmbb.com/conversion/km-to-nautical-miles.md · JSON: https://tttkmbb.com/conversion/km-to-nautical-miles.json (add
?value=for a result) · Units: /api/v1/units?quantity=length - OpenAPI operationId:
convert_units. Freshness:static. Authentication: none.