Convert km to AU
Enter the number of kilometers that you want to convert to astronomical units.
How to Convert Kilometers to Astronomical Units
The kilometer and astronomical unit are both units of length. By definition, 1 astronomical unit equals exactly 149600000 kilometers. This means to convert kilometers to astronomical units, you divide by 149600000.
Formula
Step-by-Step Example
Convert 5 km to astronomical units:
We need to convert kilometers to astronomical units
Since 1 AU = 149600000 km, divide by 149600000
5 ÷ 149600000 = 3.3422459893e-8
5 km = 3.3422459893e-8 AU
Kilometer to Astronomical Unit Conversion Table
Quick reference table for common kilometer to astronomical unit conversions. Click any value for detailed calculation.
| Kilometers (km) | Astronomical Units (AU) |
|---|---|
| 0.1 km | 6.6844919786e-10 AU |
| 0.5 km | 3.3422459893e-9 AU |
| 1 km | 6.6844919786e-9 AU |
| 2 km | 1.3368983957e-8 AU |
| 5 km | 3.3422459893e-8 AU |
| 10 km | 6.6844919786e-8 AU |
| 25 km | 1.6711229947e-7 AU |
| 50 km | 3.3422459893e-7 AU |
| 100 km | 6.6844919786e-7 AU |
About These Units
Kilometer (km)
A kilometer (km) is a metric unit of length equal to 1,000 meters or approximately 0.621 miles. Kilometers are the standard unit for measuring road distances, running races, and geographic distances in most countries worldwide. Common conversions: 1 km = 0.621 miles, 1 mile = 1.609 km.
Astronomical Unit (AU)
An astronomical unit (AU) is the average distance from Earth to the Sun: approximately 149.6 million kilometers or 93 million miles. AUs measure distances within our solar system. Mars is 1.52 AU from the Sun, Jupiter is 5.2 AU.
Frequently Asked Questions
How do I convert kilometers to astronomical units?
To convert kilometers to astronomical units, divide the value by 149600000. For example, 10 km = 6.6844919786e-8 AU.
How many astronomical units are in 1 kilometer?
1 kilometer equals 6.6844919786e-9 astronomical units.
What is the formula for kilometers to astronomical units?
The formula is: AU = km ÷ 149600000.