Kilometers to Astronomical Units

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

km
AU
1 km = 6.68e-9 AU
Full precision:6.68e-9 AU
Step-by-Step Solution

To convert 1 kilometers to au, we divide by 149597870.7 because one astronomical unit equals exactly 149597870.7 kilometers.

1 astronomical unit = 149597870.7 kilometers

Since there are 149597870.7 kilometers in every astronomical unit, we divide our value by this factor:

1 ÷ 149597870.7 = 6.68e-9 au

So 1 kilometers = 6.68e-9 au.

✓Quick check: 6.68e-9 × 149597870.7 = 1 kilometers
↔ Astronomical Units to Kilometers

How to Convert Kilometers to AU

To convert kilometers to au, divide the value by 149597870.7.

The Formula

AU = Kilometers ÷ 149597870.7

Key Fact

1 astronomical unit = 149597870.7 kilometers

Tip: To convert au back to kilometers, multiply by 149597870.7.

Example Conversions

Example 1: 1 km = 6.68e-9 AU
1 ÷ 149597870.7 = 6.68e-9
Example 2: 5 km = 3.34e-8 AU
5 ÷ 149597870.7 = 3.34e-8
Example 3: 10 km = 6.68e-8 AU
10 ÷ 149597870.7 = 6.68e-8

Kilometers to AU Table

KilometersAU
1 km6.68e-9 AU
2 km1.34e-8 AU
5 km3.34e-8 AU
10 km6.68e-8 AU
20 km1.34e-7 AU
25 km1.67e-7 AU
50 km3.34e-7 AU
100 km6.68e-7 AU
250 km0 AU
500 km0 AU
1000 km0 AU

1 Kilometer in Other Units

Unit1 km =
Kilometers to Meters1000 m
Kilometers to Astronomical Units6.68e-9 AU
Kilometers to Light Years1.06e-13 ly
Kilometers to Parsecs3.24e-14 pc
Kilometers to Kiloparsecs3.24e-17 kpc
Kilometers to Megaparsecs3.24e-20 Mpc
Kilometers to Light Seconds0.000003 ls
Kilometers to Light Minutes5.56e-8 lm
Kilometers to Miles0.621371 mi

Related Conversions

Light Years to KilometersKilometers to Light YearsLight Years to ParsecsParsecs to Light YearsAstronomical Units to KilometersLight Years to AUAU to Light Years