# Convert miles to nautical miles

Enter the number of miles you want to convert to nautical miles in the text box below. The conversion to length in nautical miles will update as you type.

miles (mi)
1 miles = 0.869 nautical miles

## Precise decimal and fraction answers

The conversion in nautical miles rounded to six significant decimal places is 1 mi = 0.868976 nmi. The precise fraction answer is 577/664 nmi.

### Decimal Precision

Conversion from one to ten decimal places

• 1 mi = 0.9 nmi
• 1 mi = 0.87 nmi
• 1 mi = 0.869 nmi
• 1 mi = 0.8690 nmi
• 1 mi = 0.86898 nmi
• 1 mi = 0.868976 nmi
• 1 mi = 0.8689762 nmi
• 1 mi = 0.86897624 nmi
• 1 mi = 0.868976242 nmi
• 1 mi = 0.8689762419 nmi

## How many nautical miles are in a mile?

There are 0.869 nautical miles in one mile. A mile is 86.90% of a nautical mile. A nautical mile is 15.08% longer than one mile.

## Miles to nautical miles conversion factor and formulas

Formula

The conversion factor between miles and nautical miles is 1.151. This represents the ratio of miles per one nautical mile. To calculate the value in nautical miles, we can either divide by the conversion factor or multiply by its inverse.

### Division

To convert from miles to nautical miles, divide miles by 1.151.
The formula is expressed as:
mi ÷ 1.151 = nmi

### Multiplication

Alternatively we can multiply by the inverse conversion factor to get the same result.
The inverse of 1.151 is 1/1.151 or 0.869. To convert from miles to nautical miles, multiply miles by 0.869.
The formula is expressed as:
mi × 0.869 = nmi

Converting miles to nautical miles is a conversion between units from separate unit systems - miles are US Customary / UK Imperial defined units while nautical miles are International Hydrographic .

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Customary/Imperial Unit

The mile is a measure of distance between two points used within the US Customary and British Imperial units of measure. It is customarily used to measure large geographical distances. The mile is officially defined as 5,280 feet, 1,760 yards or 1,609.344 meters. The abbreviation or for miles is 'mi' or sometimes 'm' as in miles per hour. The mile's origin stems from the Roman mile, which marked the distance the Roman army could march over 1,000 (mille) paces.

International Hydrographic Unit

The nautical mile is a distance measurement, usually between two geographic points. It is officially defined as being equal to 1,852 meters. The nautical mile, or international nautical mile can be found abbreviated as either M, NM, nmi or nm. Historically the nautical mile was defined as 1/16th of a degree of the earth's latitude. Given this correlation with latitude and longitude, the nautical mile has closely been associated with measurements for navigation. This tradition continues to this day as it remains the unit used to measure distance by the maritime and aviation industries. The prevalent unit of speed over water and air is the knot (nautical miles per hour).

## Reverse this conversion

Convert from nautical miles to miles instead.

## 1 miles to other length units

### Metric

• 1 mi = 1.609 km
• 1 mi = 1,609.344 m
• 1 mi = 16,093.44 dm
• 1 mi = 160,934.4 cm
• 1 mi = 1,609,344 mm
• 1 mi = 1.609×109 µ
• 1 mi = 1.609×1012 nm

### Imperial/U.S.

• 1 mi = 1 mi
• 1 mi = 1,760 yd
• 1 mi = 5,280 ft
• 1 mi = 63,360 in

## References and Citations

1. National Institute of Standards and Technology (NIST) General Tables of Units of Measurement
2. International Hydrographic Organization Resolutions of the International Hydrographic Organization

## Miles to nautical miles conversion table

mi nmi
1 mi 0.869 nmi
2 mi 1.738 nmi
3 mi 2.607 nmi
4 mi 3.476 nmi
5 mi 4.345 nmi
6 mi 5.214 nmi
7 mi 6.083 nmi
8 mi 6.952 nmi
9 mi 7.821 nmi
10 mi 8.69 nmi
mi nmi
20 mi 17.38 nmi
30 mi 26.069 nmi
40 mi 34.759 nmi
50 mi 43.449 nmi
60 mi 52.139 nmi
70 mi 60.828 nmi
80 mi 69.518 nmi
90 mi 78.208 nmi
100 mi 86.898 nmi
1,000 mi 868.976 nmi