Miles to nautical miles
1 mile = 0.868976 nautical miles
Type a value in miles (mi) to get nautical miles (nmi) straight away. A mile is smaller than a nautical mile, so the number goes down. Both units belong to length, measured here against the meter.
1 mi = 0.86897624 nmi
Formula
nmi = mi × 0.86897624
One mile is 0.86897624 nautical miles, so multiply by that factor. You can also divide by 1.15078, the number of miles in one nautical mile. Here mi is the value in miles and nmi is the result in nautical miles.
Worked example: 26.2 miles × 0.86897624 = 22.7672 nautical miles.
Miles to nautical miles table
| miles (mi) | nautical miles (nmi) |
|---|---|
| 1 mi | 0.868976 nmi |
| 2 mi | 1.73795 nmi |
| 3 mi | 2.60693 nmi |
| 4 mi | 3.4759 nmi |
| 5 mi | 4.34488 nmi |
| 6 mi | 5.21386 nmi |
| 7 mi | 6.08283 nmi |
| 8 mi | 6.95181 nmi |
| 9 mi | 7.82079 nmi |
| 10 mi | 8.68976 nmi |
| 15 mi | 13.0346 nmi |
| 20 mi | 17.3795 nmi |
| 25 mi | 21.7244 nmi |
| 30 mi | 26.0693 nmi |
| 40 mi | 34.759 nmi |
| 50 mi | 43.4488 nmi |
| 60 mi | 52.1386 nmi |
| 75 mi | 65.1732 nmi |
| 100 mi | 86.8976 nmi |
Everyday miles in nautical miles
| What it is | mi | nmi |
|---|---|---|
| a mile run | 1 mi | 0.868976 nmi |
| a 5K run (about) | 3.1 mi | 2.69383 nmi |
| a half marathon (about) | 13.1 mi | 11.3836 nmi |
| a marathon (about) | 26.2 mi | 22.7672 nmi |
| an ultramarathon | 100 mi | 86.8976 nmi |
Quick estimate in your head
Multiply by about 0.87. For 26.2 mi that gives 22.79 nmi against an exact 22.7672 nmi, an error of 0.1%.
Watch out for
- A nautical mile (1,852 m) is about 15% longer than a statute mile (1,609 m).
About the units
Mile (mi). The statute mile: 5,280 feet or exactly 1,609.344 m. Used for road distances in the US and UK.
Nautical mile (nmi). Exactly 1,852 m, about one minute of latitude. Used in sea and air navigation.
Going the other way, 1 nautical mile is 1.15078 miles.
Questions
How many nautical miles are in 1 mile?
1 mile is 0.868976 nautical miles, and 1 nautical mile is 1.15078 miles.
How do I convert miles to nautical miles?
Use nmi = mi × 0.86897624. For example, 26.2 miles × 0.86897624 = 22.7672 nautical miles.
Is the mile to nautical mile factor exact?
Yes, the definitions are exact, so the factor is exact. Results here are rounded to 6 significant digits for display.
How much is an ultramarathon in nautical miles?
100 mi is 86.8976 nmi.
Source for the conversion factor: NIST SP 811, Appendix B (conversion factors).
Related conversions
- nautical miles to miles
- miles to kilometers
- miles to feet
- nautical miles to kilometers
- kilometers to nautical miles
- centimeters to inches