Kilometers to Astronomical Units

Convert kilometers (km) to astronomical units (AU) with formulas, examples, and conversion tables.

Kilometers (km)

Astronomical Units (AU)

1 km = 6.68e-9 AU

Full precision:6.68e-9 AU

Feet + Inches:129166' 11.1"

Step-by-Step Solution

To convert 1 kilometers to astronomical units, we divide by 149600000 because one astronomical unit equals exactly 149600000 kilometers.

1 astronomical unit = 149600000 kilometers

Since there are 149600000 kilometers in every astronomical unit, we divide our value by this factor:

1 ÷ 149600000 = 6.68e-9 astronomical units

So 1 kilometers = 6.68e-9 astronomical units.

✓Quick check: 6.68e-9 × 149600000 = 1 kilometers

How to Convert Kilometers to Astronomical Units

To convert kilometers to astronomical units, divide the value by 149600000.

Astronomical Units = Kilometers ÷ 149600000

1 astronomical unit = 149600000 kilometers

Tip: To convert astronomical units back to kilometers, multiply by 149600000.

Example 1: 1 km = 6.68e-9 AU
1 ÷ 149600000 = 6.68e-9

Example 2: 5 km = 3.34e-8 AU
5 ÷ 149600000 = 3.34e-8

Example 3: 10 km = 6.68e-8 AU
10 ÷ 149600000 = 6.68e-8

Unit	1 km =
KM to Meters	1000 m
Kilometers to Centimeters	100000 cm
Kilometers to Millimeters	1000000 mm
Kilometers to Micrometers	1000000000 μm
Kilometers to Nanometers	1e+12 nm
KM to Miles	0.621371 mi
Kilometers to Yards	1093.61 yd
Kilometers to Feet	3280.84 ft
Kilometers to Inches	39370.08 in
KM to Nautical Miles	0.539957 nmi
Kilometers to Fathoms	546.807 ftm
Kilometers to Light Years	1.06e-13 ly
Kilometers to Astronomical Units	6.68e-9 AU
Kilometers to Parsecs	3.24e-14 pc
Kilometers to Angstroms	1e+13 Å
Kilometers to Planck Lengths	6.19e+37 ℓP
Kilometers to Rods	198.839 rd

The kilometer (km) is a unit of length in the metric system. One kilometer equals 1000 meters.

The astronomical unit (AU) is a unit of length in the astronomical system. One astronomical unit equals 149600000000 meters.