Home › Unit Conversion › Miles to Nautical miles
Miles to Nautical miles (mi to nmi)
Convert miles to nautical miles: 1 mi = 0.868976 nmi. Exact conversion factor, formula, 22-row table and worked examples, with JSON API and MCP access.
Formula
1 mi = 0.868976 nmi
nautical miles = miles × 0.8689762419 — reverse: miles = nautical miles × 1.150779448
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 mi = 4.34488 nmi
- 12.5 mi = 10.8622 nmi
- 100 mi = 86.8976 nmi
Miles to nautical miles conversion table
| Miles (mi) | Nautical miles (nmi) |
|---|---|
| 1 | 0.868976 |
| 2 | 1.73795 |
| 3 | 2.60693 |
| 4 | 3.4759 |
| 5 | 4.34488 |
| 6 | 5.21386 |
| 7 | 6.08283 |
| 8 | 6.95181 |
| 9 | 7.82079 |
| 10 | 8.68976 |
| 15 | 13.0346 |
| 20 | 17.3795 |
| 25 | 21.7244 |
| 30 | 26.0693 |
| 40 | 34.759 |
| 50 | 43.4488 |
| 75 | 65.1732 |
| 100 | 86.8976 |
| 200 | 173.795 |
| 250 | 217.244 |
| 500 | 434.488 |
| 1000 | 868.976 |
FAQ
How many nautical miles are in one mile?
1 mi = 0.868976 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 miles to nautical miles?
Multiply the value in miles by 0.8689762419: nautical miles = miles × 0.8689762419. For example, 5 mi = 4.34488 nmi.
How do I convert nautical miles back to miles?
Multiply by the inverse factor 1.150779448 (miles = nautical miles × 1.150779448), or use the nautical miles-to-miles page.
Related conversions
Machine access
- API:
GET https://tttkmbb.com/api/v1/convert?value=5&from_unit=mi&to_unit=nmi - MCP: server
https://tttkmbb.com/mcp, toolconvert_unitswith{"value":5,"from_unit":"mi","to_unit":"nmi"} - Markdown: https://tttkmbb.com/conversion/miles-to-nautical-miles.md · JSON: https://tttkmbb.com/conversion/miles-to-nautical-miles.json (add
?value=for a result) · Units: /api/v1/units?quantity=length - OpenAPI operationId:
convert_units. Freshness:static. Authentication: none.