Convert Kilometers to Astronomical Units
Convert Kilometers (km) to Astronomical Units (AU) instantly and accurately.
Conversion Formula
AU = km × 6.684587122e-9
About Kilometers
A kilometer (km) is 1,000 meters and the standard unit for measuring longer distances in most of the world. It takes about 10-12 minutes to walk one kilometer at a normal pace. Common references include: a typical city block might be 100-200 meters (0.1-0.2 km), most cars display speed in km/h, and marathon races are 42.195 kilometers long. Road signs, GPS systems, and maps globally use kilometers to indicate distances between cities and locations.
About Astronomical Units
An astronomical unit (AU) is the average distance between Earth and the Sun, precisely defined as 149,597,870.7 kilometers. This unit provides a convenient scale for measuring distances within our solar system. Mars orbits at 1.5 AU, Jupiter at 5.2 AU, and Neptune at about 30 AU from the Sun. The dwarf planet Pluto reaches up to 49 AU away. Light takes about 8.3 minutes to travel 1 AU, explaining why we see the Sun as it was 8 minutes ago. The AU is fundamental in astronomy and space exploration.
Quick Reference Table
| Kilometers (km) | Astronomical Units (AU) |
|---|---|
| 1 km | 6.685 × 10-9 AU |
| 2 km | 1.337 × 10-8 AU |
| 5 km | 3.342 × 10-8 AU |
| 10 km | 6.685 × 10-8 AU |
| 25 km | 1.671 × 10-7 AU |
| 50 km | 3.342 × 10-7 AU |
| 100 km | 6.685 × 10-7 AU |