Kilometers to astronomical units
1 kilometer in astronomical units
1 km = 6.685 × 10^-9 AU
AU = km × 6.684587122 × 10^-9
To convert kilometers to astronomical units, multiply by 6.684587122 × 10^-9. The table below gives the values people look up most often, and the converter works for any number.
Kilometers to astronomical units table
| Kilometers | Astronomical units |
|---|---|
| 1 km | 6.685 × 10^-9 |
| 2 km | 1.337 × 10^-8 |
| 3 km | 2.005 × 10^-8 |
| 4 km | 2.674 × 10^-8 |
| 5 km | 3.342 × 10^-8 |
| 10 km | 6.685 × 10^-8 |
| 15 km | 1.003 × 10^-7 |
| 20 km | 1.337 × 10^-7 |
| 25 km | 1.671 × 10^-7 |
| 30 km | 2.005 × 10^-7 |
| 40 km | 2.674 × 10^-7 |
| 50 km | 3.342 × 10^-7 |
| 75 km | 5.013 × 10^-7 |
| 100 km | 6.685 × 10^-7 |
| 250 km | 0.000001671 |
| 500 km | 0.000003342 |
| 1,000 km | 0.000006685 |
How the conversion works
The relationship is AU = km × 6.684587122 × 10^-9. Both units measure length, so the conversion is a fixed factor that never changes.
Common questions
- How many astronomical units are in one kilometer?
- One kilometer equals 6.685 × 10^-9 astronomical units. AU = km × 6.684587122 × 10^-9.
- How do you convert kilometers to astronomical units?
- Use AU = km × 6.684587122 × 10^-9. So 10 km is 6.685 × 10^-8 AU.
- How many kilometers are in one astronomical unit?
- One astronomical unit equals 149,597,870 kilometers, which is the reverse of the conversion above.
Related pages
Sources
- Guide for the Use of the International System of Units (SP 811) — NIST (Public domain (US Government))
- The International System of Units (SI Brochure) — Bureau International des Poids et Mesures
- Calculated on this page — At One Place