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Convert Kilometer (km) to Astronomical Unit (au)

Please provide values below to convert Kilometer (km) to Astronomical Unit (au).
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      Updated on September 1, 2025

      About Kilometer (km) to Astronomical Unit (au) Conversion Calculator

      Written By
      author
      Nadiba Rahman
      Reviewed by
      author
      Mrinmoy Roy
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      You can use our Kilometer (km) to Astronomical Unit (au) conversion calculator as a reliable and efficient tool to simplify length conversions. It is designed for professionals, students, and anyone who needs a quick and accurate result. Conversion of Kilometer (km) to Astronomical Unit (au) is crucial in Space measurement related measurements. You can avoid the risk of manual calculation errors and save valuable time using our Kilometer (km) to Astronomical Unit (au) converter.

      Relation Between Kilometer (km) and Astronomical Unit (au)

      Let me explain to you about the relation between Kilometer km and Astronomical Unit (au) first before moving to the conversion process. Because it’s essential to grasp what these units represent.

      What is Kilometer (km)?

      A kilometer is a unit of length equal to 1,000 meters. Kilometer (km) is a unit of length measurement which is commonly used in Space measurement. Commonly used in the metric system for measuring large distances like roads. Preferred for scientific and everyday use globally, except in the US..

      What is Astronomical Unit (au)?

      Kilometer (km) is another unit of length measurement that is used in Astronomy. An astronomical unit (AU) is the average distance between the Earth and the Sun, approximately 149.6 million kilometers.. Commonly used in the metric system for measuring large distances like roads. Preferred for scientific and everyday use globally, except in the US..

      How to Convert Astronomical Unit (au)?

      The conversion between Kilometer (km) and Astronomical Unit (au) follows a simple formula:

      Kilometer = Kilometer × 6.684587122268446e-9

      Where, 6.684587122268446e-9 is the value that allows you to convert between Kilometer (km) and Astronomical Unit (au).

      So,

      1 Astronomical Unit = 6.684587122268446e-9 Kilometer

      And, 1 Kilometer = 1/6.684587122268446e-9 Astronomical Unit
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      Examples of Converting Kilometer (km) to Astronomical Unit (au)

      To convert any value from Kilometer (km) to Astronomical Unit (au), simply multiply the amount of Kilometer (km) by the conversion factor:

      1 Astronomical Unit = 6.684587122268446e-9 Kilometer

      For example, if you want to convert 5 Kilometer into Astronomical Unit and the conversion factor is 6.684587122268446e-9, then:

      5 Kilometer = 5 x 6.684587122268446e-9 Astronomical Unit

      Kilometer (km) to Astronomical Unit (au) Conversion Chart

      Here’s a quick reference chart for common conversions between Kilometer (km) and Astronomical Unit (au)
      Kilometer (km)Astronomical Unit (au)
      1000 Kilometer (km)0.000006684587122268446 Astronomical Unit (au)
      10000 Kilometer (km)0.00006684587122268445 Astronomical Unit (au)
      100000 Kilometer (km)0.0006684587122268446 Astronomical Unit (au)
      1000000 Kilometer (km)0.006684587122268446 Astronomical Unit (au)
      10000000 Kilometer (km)0.06684587122268446 Astronomical Unit (au)
      100000000 Kilometer (km)0.6684587122268446 Astronomical Unit (au)
      1000000000 Kilometer (km)6.684587122268446 Astronomical Unit (au)
      10000000000 Kilometer (km)66.84587122268445 Astronomical Unit (au)
      100000000000 Kilometer (km)668.4587122268446 Astronomical Unit (au)
      1000000000000 Kilometer (km)6684.5871222684455 Astronomical Unit (au)
      You can use the above chart for quick and easy reference.

      How 1 Kilometer (km) Converts to Other length Units

      See the relation between Kilometer (km) and other length related measurement units:
      1 Kilometer(km)10000000000000.000000 Angstrom (Å)
      1 Kilometer(km)5.399568 Cables
      1 Kilometer(km)100000.000000 Centimeter (cm)
      1 Kilometer(km)10000.000000 Decimeter (dm)
      1 Kilometer(km)874.890639 Ells (ells)
      1 Kilometer(km)864000.000000 Ems (ems)
      1 Kilometer(km)546.806649 Fathom
      1 Kilometer(km)3280.839895 Foot (ft)
      1 Kilometer(km)4.970970 Furlong
      1 Kilometer(km)9842.519685 Hand
      1 Kilometer(km)10.000000 Hectometer (hm)
      1 Kilometer(km)39370.078740 Inch (in)
      1 Kilometer(km)0.000000 Light Year (ly)
      1 Kilometer(km)1000.000000 Meter (m)
      1 Kilometer(km)1000000000.000000 Micrometer (µm)
      1 Kilometer(km)39370078.740157 Mil (mil)
      1 Kilometer(km)0.621371 Mile (mi)
      1 Kilometer(km)1000000.000000 Millimeter (mm)
      1 Kilometer(km)1000000000000.000000 Nanometer (nm)
      1 Kilometer(km)0.000000 Parsec (pc)
      1 Kilometer(km)1000000000000000.000000 Picometer (pm)
      1 Kilometer(km)39370078.740157 Thou
      1 Kilometer(km)1093.613298 Yard (yd)

      Features of Our Kilometer (km) to Astronomical Unit (au) Conversion Calculator

      Our Kilometer km to Astronomical Unit (au) converter is more than just a basic converter. Here's what makes it stand out:

      Output Precision Control

      You can control how precise your conversion results are. From settings, you can adjust decimal places from 0 to 12 places.

      Customizable Rounding Options

      You can control the output rounding options based on your necessity. You can turn the rounding mode on or off, and select between Ceiling or Floor rounding to match your needs.

      Multiple Number Formats

      Display your results the way you want:
      1. Standard format (e.g. 12.345245)
      2. Scientific notation (e.g. 1.23452e+1)
      3. Engineering format (e.g. 1.23452 × 10^1)

      Integrated Scientific Calculator

      We know you need to switch between a unit converter and a general calculator back and forth. To minimize your hassle, our Kilometer km to Astronomical Unit (au) converter comes up with an integrated scientific calculator.

      Conversion History Tracking

      You can always review your past length conversions and go to them whenever you like. It stores your most recent 10 unit conversions.

      Thousand Separators Toggle

      Our Kilometer km to Astronomical Unit (au) converter improves the output readability by toggling the thousand separators “On”. It’s useful when you work with large numbers.

      Conclusion

      Now, you understand how to convert Kilometer km to Astronomical Unit (au) manually. But you can bypass the manual calculation using our length conversion calculator. This allows you to get faster and accurate results in Astronomical Unit (au), which you can use in Space measurement related measurements. With the help of our integrated scientific calculator, calculation history tracking, and precision control, our Kilometer km to Astronomical Unit (au) converter is your swiss army knife for daily calculations.
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