Length and Area
mitonmi
Convert miles (mi) to nautical miles (nmi).
Factor1 mi = 0.8689762 nmi
Converter
mi
Accepts numbers or expressions, e.g. 150 + 14.7
Result
nmi
Rendered to 6 significant figures.
Formula
Formula
nmi = mi × 0.8689762
Multiply any value in miles by 0.8689762 to obtain the value in nautical miles.
Worked example
Convert 100 mi to nmi.
- 01Start with 100 mi.
- 02Multiply by the conversion factor: 100 × 0.8689762 = 86.8976 nmi.
Result100 mi = 86.8976 nmi
Conversion table
| mi | nmi |
|---|---|
| 1 | 0.86898 |
| 2 | 1.738 |
| 5 | 4.3449 |
| 10 | 8.6898 |
| 20 | 17.38 |
| 50 | 43.449 |
| 100 | 86.898 |
| 200 | 173.8 |
| 500 | 434.49 |
| 1000 | 868.98 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from mi to nmi?
1 mi equals 0.8689762 nmi. To convert, multiply the value in miles by 0.8689762.
How do I convert 1 mi to nmi?
1 mi = 0.868976 nmi. For any value, multiply by 0.8689762.
How do I convert nmi back to mi?
Divide by the same factor — or equivalently, multiply by 1.150779. So 1 nmi = 1.15078 mi.
When would I need to convert mile to nautical mile?
Length conversions appear in piping, layout, and mechanical drawings — particularly when reconciling imperial fittings or instrument lengths with metric plant drawings.
Is the conversion exact?
Yes. Both mi and nmi are defined by exact SI relationships, so the displayed factor is exact (any rounding shown is only for display).