Mile to Nautical Mile Converter
Length · unit-converter
Convert Mile to Nautical Mile with a fixed input and output unit, step-by-step formula line, and reference tables. All calculations use SI-based definitions (international yard, nautical mile, etc.).
Calculator
From: Mile (mi)
To: Nautical Mile (nmi)
About Mile
The statute mile is a US customary and imperial unit equal to exactly 1,609.344 meters. It is widely used for road distances in the United States and the United Kingdom.
About Nautical Mile
The nautical mile is a non-SI unit of length used in air and sea navigation. It is defined as exactly 1,852 meters (about 1.15078 statute miles).
How to convert miles to nautical miles
1 mile is equal to 0.86897624190065 nautical mile:
1 mi = (1609.344 m ÷ 1852 m) nmi = 0.86897624190065 nmi
Each mile is defined as 1609.344 m and each nautical mile as 1852 m, so one mi equals 1609.344 ÷ 1852 nmi = 0.86897624190065 nmi.
Let d(mi) be the numeric value of the same length measured in Mile (mi), and d(nmi) the value in Nautical Mile (nmi). Then:
d(nmi) = d(mi) × (1609.344 / 1852)
Equivalently, divide by how many mi fit into one nmi (meters per nmi divided by meters per mi):
d(nmi) = d(mi) ÷ 1.15077944802354
Or: nautical mile = mile ÷ 1.15077944802354
Examples
Example #1: Convert 20 mi to nautical mile
20 mi = 20 mi × (1609.344/1852) nmi = 17.379524838 nmi
20 mi = 20 mi ÷ 1.15077944802354 = 17.379524838 nmi
Example #2: Convert 50 mi to nautical mile
50 mi = 50 mi × (1609.344/1852) nmi = 43.448812095 nmi
50 mi = 50 mi ÷ 1.15077944802354 = 43.448812095 nmi
Summary
To convert Mile to Nautical Mile, multiply the value in mi by the ratio of meters per mi divided by meters per nmi. Equivalently: value_nmi = value_mi × (1609.344 / 1852). Numerically, 1 mi equals 0.8689762419006479 nmi.
Relationship context
You are converting between US customary / imperial (Miles) and nautical (navigation) (Nautical Miles). Metric units are decimal; imperial units use inches, feet, yards, and miles tied to the international yard definition. Nautical miles are defined in meters (1 nmi = 1,852 m). This tool uses SI-based factors so results stay consistent with modern standards.
Conversion tables
| Mile (mi) | Nautical Mile (nmi) |
|---|---|
| 0.1 | 0.0868976242 |
| 1 | 0.8689762419 |
| 2 | 1.7379524838 |
| 3 | 2.6069287257 |
| 4 | 3.4759049676 |
| 5 | 4.3448812095 |
| 6 | 5.2138574514 |
| 7 | 6.0828336933 |
| 8 | 6.9518099352 |
| 9 | 7.8207861771 |
| Mile (mi) | Nautical Mile (nmi) |
|---|---|
| 10 | 8.689762419 |
| 20 | 17.379524838 |
| 30 | 26.069287257 |
| 40 | 34.759049676 |
| 50 | 43.448812095 |
| 60 | 52.138574514 |
| 70 | 60.828336933 |
| 80 | 69.5180993521 |
| 90 | 78.2078617711 |
| 100 | 86.8976241901 |