Kilometers to Astronomical Units (km → au)
Formula
1 km = 6.684491978609626e-9 auConversion Table
| km | au |
|---|---|
| 0 | 0 |
| 1.0000 | 0.0000000066845 |
| 2.0000 | 0.000000013369 |
| 3.0000 | 0.000000020053 |
| 4.0000 | 0.000000026738 |
| 5.0000 | 0.000000033422 |
| 6.0000 | 0.000000040107 |
| 7.0000 | 0.000000046791 |
| 8.0000 | 0.000000053476 |
| 9.0000 | 0.000000060160 |
| 10.000 | 0.000000066845 |
| 11.000 | 0.000000073529 |
| 12.000 | 0.000000080214 |
| 13.000 | 0.000000086898 |
| 14.000 | 0.000000093583 |
| 15.000 | 0.00000010027 |
| 16.000 | 0.00000010695 |
| 17.000 | 0.00000011364 |
| 18.000 | 0.00000012032 |
| 19.000 | 0.00000012701 |
| km | au |
|---|---|
| 20.000 | 0.00000013369 |
| 21.000 | 0.00000014037 |
| 22.000 | 0.00000014706 |
| 23.000 | 0.00000015374 |
| 24.000 | 0.00000016043 |
| 25.000 | 0.00000016711 |
| 26.000 | 0.00000017380 |
| 27.000 | 0.00000018048 |
| 28.000 | 0.00000018717 |
| 29.000 | 0.00000019385 |
| 30.000 | 0.00000020053 |
| 31.000 | 0.00000020722 |
| 32.000 | 0.00000021390 |
| 33.000 | 0.00000022059 |
| 34.000 | 0.00000022727 |
| 35.000 | 0.00000023396 |
| 36.000 | 0.00000024064 |
| 37.000 | 0.00000024733 |
| 38.000 | 0.00000025401 |
| 39.000 | 0.00000026070 |
| km | au |
|---|---|
| 40.000 | 0.00000026738 |
| 41.000 | 0.00000027406 |
| 42.000 | 0.00000028075 |
| 43.000 | 0.00000028743 |
| 44.000 | 0.00000029412 |
| 45.000 | 0.00000030080 |
| 46.000 | 0.00000030749 |
| 47.000 | 0.00000031417 |
| 48.000 | 0.00000032086 |
| 49.000 | 0.00000032754 |
| 50.000 | 0.00000033422 |
| 51.000 | 0.00000034091 |
| 52.000 | 0.00000034759 |
| 53.000 | 0.00000035428 |
| 54.000 | 0.00000036096 |
| 55.000 | 0.00000036765 |
| 56.000 | 0.00000037433 |
| 57.000 | 0.00000038102 |
| 58.000 | 0.00000038770 |
| 59.000 | 0.00000039439 |
| km | au |
|---|---|
| 60.000 | 0.00000040107 |
| 61.000 | 0.00000040775 |
| 62.000 | 0.00000041444 |
| 63.000 | 0.00000042112 |
| 64.000 | 0.00000042781 |
| 65.000 | 0.00000043449 |
| 66.000 | 0.00000044118 |
| 67.000 | 0.00000044786 |
| 68.000 | 0.00000045455 |
| 69.000 | 0.00000046123 |
| 70.000 | 0.00000046791 |
| 71.000 | 0.00000047460 |
| 72.000 | 0.00000048128 |
| 73.000 | 0.00000048797 |
| 74.000 | 0.00000049465 |
| 75.000 | 0.00000050134 |
| 76.000 | 0.00000050802 |
| 77.000 | 0.00000051471 |
| 78.000 | 0.00000052139 |
| 79.000 | 0.00000052807 |
Kilometers to Astronomical Units Conversion
Converting Kilometers (km) to Astronomical Units (au) is a common length conversion. 1 km equals 0 au. For example, 100 km is equal to 0.000001 au.
Quick Mental Math: Kilometers to Astronomical Units
Reference a linear anchor between kilometers and astronomical units; use one memorable value.
Why is converting Kilometers to Astronomical Units tricky?
Magnitude or direction confusion between kilometers and astronomical-units is the primary error source.
Quick Reference Values
1 km = 0 au. 5 km = 0 au. 10 km = 0 au. 25 km = 0 au. 50 km = 0 au. 100 km = 0.000001 au.
What is Kilometers?
Kilometers (km) is a unit of length. The kilometer is a metric unit of length equal to 1,000 meters. It is used as a standard measure for distances in the SI system, where one meter is defined by the speed of light in vacuum. The kilometer facilitates expressing larger distances conveniently [bipm-si-brochure]. The kilometer was established in France during the metric system's creation in the late 18th century as 1,000 meters. It was adopted internationally to provide a uniform length measurement for land distances and mapping [bipm-si-brochure]. Kilometers are widely used globally for road distances, geography, and transportation metrics. Countries including Canada, Australia, and most of Europe use kilometers for speed limits and distance signs, following SI conventions [nist-si-guide].
What is Astronomical Units?
Astronomical Units (au) is a unit of length. An astronomical unit (au) is defined as exactly 149,597,870.7 kilometers. It represents the average distance from Earth to the Sun and is used as a standard measure for distances within the solar system [cgpm-resolutions]. The astronomical unit was formally defined by the International Astronomical Union in 2012 to replace earlier approximations and improve measurement precision in celestial mechanics [cgpm-resolutions]. The au is the standard unit of length in astronomy for expressing distances between planets and other solar system bodies. It is used globally by space agencies such as NASA and ESA [nist-cuu].
Common Misspellings
People often search for this conversion using these alternate spellings: kilometres, kilomiter, kilometerss, kilomters, astronomical unit, au unit, astronomic unit, astronomical unites. All of these refer to the Kilometers to Astronomical Units conversion.