Nautical Mile to Astronomical Unit Converter
Convert Nautical Mile (nmi) to Astronomical Unit (AU) instantly. 1 nmi = 1.237986e-8 AU.
Length Converter
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1 nmi = 1.237986e-8 AU
Formula:
AU = nmi × 1.237986e-8With your value: 1 nmi = 1.237986e-8 AU
How big is that?
Everyday references on a logarithmic scale, all expressed in nautical mile so you can sanity-check the result.
Other Nautical Mile to Astronomical Unit conversions
Nautical Mile to Astronomical Unit Conversion Table
| Nautical Mile (nmi) | Astronomical Unit (AU) |
|---|---|
| 0.5 | 6.189928e-9 |
| 1 | 1.237986e-8 |
| 2 | 2.475971e-8 |
| 5 | 6.189928e-8 |
| 10 | 1.237986e-7 |
| 15 | 1.856978e-7 |
| 20 | 2.475971e-7 |
| 25 | 3.094964e-7 |
| 50 | 6.189928e-7 |
| 100 | 1.237986e-6 |
| 250 | 3.094964e-6 |
| 500 | 6.189928e-6 |
| 1000 | 1.237986e-5 |
Astronomical Unit to Nautical Mile Conversion Table
| Astronomical Unit (AU) | Nautical Mile (nmi) |
|---|---|
| 0.5 | 40,388,194.033477 |
| 1 | 80,776,388.066955 |
| 2 | 161,552,776.133909 |
| 5 | 403,881,940.334773 |
| 10 | 807,763,880.669547 |
| 15 | 1,211,645,821.00432 |
| 20 | 1,615,527,761.339093 |
| 25 | 2,019,409,701.673866 |
| 50 | 4,038,819,403.347732 |
| 100 | 8,077,638,806.695464 |
| 250 | 20,194,097,016.738663 |
| 500 | 40,388,194,033.477325 |
| 1000 | 80,776,388,066.95465 |
Where these values come from
Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.
Nautical Mile (nmi)
Length
1 international nautical mile = 1852 m exactly, adopted by the First International Extraordinary Hydrographic Conference (1929).
Source: Units accepted for use with the SI, SI Brochure Table 8
Bureau International des Poids et Mesures · Reviewed 2026-07-01
Astronomical Unit (AU)
Length
The astronomical unit is exactly 149 597 870 700 m (IAU Resolution B2, 2012).
Source: IAU Resolution B2 (2012) — definition of the astronomical unit; IAU B2 (2015) nominal values
International Astronomical Union · Reviewed 2026-07-01
How to Convert Nautical Mile to Astronomical Unit
To convert from Nautical Mile (nmi) to Astronomical Unit (AU), multiply the value by 1.237986e-8.
Formula: AU = nmi × 1.237986e-8
Reverse: nmi = AU × 80,776,388.06695464
Step-by-Step Example
- Start with your value in Nautical Mile. For example: 5 nmi
- Multiply by the conversion factor: 5 x 1.237986e-8
- The result is: 6.189928e-8 AU
About Nautical Mile
The nautical mile equals 1,852 meters and is used primarily in aviation and maritime navigation.
Fun Fact: One nautical mile corresponds to one minute of latitude on the Earth's surface.
Common uses: navigation, aviation, maritime.
About Astronomical Unit
The astronomical unit (AU) is defined as exactly 149,597,870,700 metres, close to the mean Earth–Sun distance. It is the natural yardstick for the Solar System.
Common uses: planetary science, orbital mechanics, astronomy.
Frequently Asked Questions
How many Astronomical Unit are in 1 Nautical Mile?
There are exactly 1.237986e-8 Astronomical Unit in 1 Nautical Mile. This means the conversion factor from Nautical Mile to Astronomical Unit is 1.237986e-8.
What is the formula to convert Nautical Mile to Astronomical Unit?
The formula to convert Nautical Mile to Astronomical Unit is: AU = nmi × 1.237986e-8. For example, to convert 10 Nautical Mile to Astronomical Unit, you would multiply 10 by 1.237986e-8.
What is a Nautical Mile?
The nautical mile equals 1,852 meters and is used primarily in aviation and maritime navigation.
What is a Astronomical Unit?
The astronomical unit (AU) is defined as exactly 149,597,870,700 metres, close to the mean Earth–Sun distance. It is the natural yardstick for the Solar System.
What are the common uses of Nautical Mile?
The Nautical Mile is commonly used in navigation, aviation, maritime.
Related Length Conversions
Cite this page
UnitConvertLab. (2026). Nautical Mile to Astronomical Unit converter. UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/nautical_mile-to-astronomical_unit