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Convert Kilometer to Astronomical Unit

1 kilometer = 6.6845871e-9 astronomical units (km to AU).

The kilometer (km) and the astronomical unit (AU) both measure length. A kilometer is smaller than a astronomical unit — it takes 149,598,000 of them to make a single astronomical unit. Going the other way, one astronomical unit is 149,598,000 kilometers. The converter above does this in real time, and the reference chart lists the values that come up most often.

6.6845871e-9

1 km = 6.6845871e-9 AU

How to convert Kilometers to Astronomical Units

Multiply the kilometer value by 6.68459e-9 to get astronomical units.

Example: 10 kilometers = 6.68459e-8 astronomical units.

Kilometer to Astronomical Unit Conversion Chart

KilometersAstronomical Units
1 km6.6845871e-9 AU
2 km1.3369174e-8 AU
3 km2.0053761e-8 AU
5 km3.3422936e-8 AU
10 km6.6845871e-8 AU
20 km1.3369174e-7 AU
25 km1.6711468e-7 AU
50 km3.3422936e-7 AU
100 km6.6845871e-7 AU
1000 km0.0000066845871 AU

Frequently Asked Questions

How many astronomical units are in a kilometer?
There are 6.6845871e-9 astronomical units in 1 kilometer.
How do you convert kilometers to astronomical units?
Multiply the kilometer value by 6.68459e-9 to get astronomical units.
What is 5 kilometers in astronomical units?
5 kilometers equals 3.3422936e-8 astronomical units.
What is 100 kilometers in astronomical units?
100 kilometers equals 6.6845871e-7 astronomical units.
What is 1 astronomical unit in kilometers?
1 astronomical unit equals 149,597,870 kilometers.
Is this kilometer to astronomical unit converter free?
Yes. The converter is free, needs no sign-up, and runs entirely in your browser — the values you enter never leave your device.

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