Miles to Nautical Miles
( mi → nmi )
Instantly convert statute miles to nautical miles. Enter any value below and get an accurate result with the full formula and reference table.
How to Convert Miles to Nautical Miles
To convert statute miles to nautical miles, multiply the number of miles by 0.868976. This factor comes from the definitions: one statute mile equals 1,609.344 meters, while one nautical mile equals 1,852 meters. Therefore, 1 mi = 1609.344 / 1852 = 0.8689762419… nmi.
Step-by-Step Example
Let’s convert 10 miles to nautical miles:
1. Multiply by 0.868976: 10 × 0.868976 = 8.68976 nautical miles
2. So 10 miles is approximately 8.69 nautical miles.
For a distance of 100 miles: 100 × 0.868976 = 86.8976 nautical miles.
Why This Conversion?
The statute mile originated from Roman paces and was later standardized. The nautical mile is based on the Earth’s circumference — one minute of latitude. Since they are based on different references, the conversion factor is not a round number but is exact when using the meter definitions.
When You’d Use Each Unit
Statute miles are used on land in the US and UK for road distances and speed limits. Nautical miles are used in aviation, marine navigation, and for international boundaries at sea. Converting between them is essential for flight planning, sea travel, and understanding global distances.
Common miles values converted to nautical miles — popular distances highlighted.
| Miles (mi) | Nautical Miles (nmi) | Approximate |
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