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Free Length Converter

Kilometer to astronomical unit.

One kilometer equals 6.684587e-9 astronomical unit. Use this converter for quick, accurate km to au conversions.

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Conversion formula.

1 km = 6.684587e-9 au

To convert kilometer to astronomical unit, multiply the value in km by 6.684587e-9.

Quick examples

  • 1 km = 6.684587e-9 au
  • 5 km = 3.342294e-8 au
  • 10 km = 6.684587e-8 au
  • 100 km = 6.684587e-7 au

Kilometer to Astronomical Unit conversion table.

Kilometer (km)Astronomical Unit (au)
16.684587e-9
21.336917e-8
32.005376e-8
42.673835e-8
53.342294e-8
64.010752e-8
74.679211e-8
85.34767e-8
96.016128e-8
106.684587e-8
117.353046e-8
128.021505e-8
138.689963e-8
149.358422e-8
151.002688e-7
161.069534e-7
171.13638e-7
181.203226e-7
191.270072e-7
201.336917e-7
Convert the other way: Astronomical Unit to Kilometer

Related conversions.

Millimeter to KilometerMillimeter to Astronomical UnitCentimeter to KilometerCentimeter to Astronomical UnitDecimeter to KilometerDecimeter to Astronomical Unit

More Kilometer conversions.

km → mmkm → cmkm → dmkm → mkm → μmkm → nmkm → inkm → ft

Frequently asked questions.

How many astronomical unit are in a kilometer?
One kilometer equals 6.684587e-9 astronomical unit (au).
How do I convert km to au?
Multiply the value in km by 6.684587e-9. For example, 10 km = 6.684587e-8 au.
Is this conversion exact?
Yes. This converter uses the internationally defined factor: 1 km = 6.684587e-9 au.