Kilometers (km)	Astronomical Units (AU)
1 km	6.6846e-9 AU
2 km	1.3369e-8 AU
5 km	3.3423e-8 AU
10 km	6.6846e-8 AU
25 km	1.6711e-7 AU
50 km	3.3423e-7 AU
100 km	6.6846e-7 AU
250 km	0.000001671 AU
500 km	0.000003342 AU
1000 km	0.000006685 AU

Convert Kilometers to Astronomical Units

Convert kilometers to astronomical units (km to AU) with our instant calculator. 1 km = 0 AU. Includes exact formula and reference tables.

How to Convert Kilometers to Astronomical Units (km to AU)

1 Kilometer (km) is equal to 0 Astronomical Units (AU). Multiply the kilometer value by 6.684587122e-9

Quick Answer 1 km = 0 AU

Formula AU = km × 6.684587122e-9

Inverse Factor 1 AU = 149597870.7 km

Unit Definitions & Metrology Context

The standard SI base unit of length is the meter (m), defined as the distance traveled by light in a vacuum in 1/299,792,458 of a second.

About Kilometers (km): Kilometer (km) is a unit in the Length & Distance measurement category. It is a standard everyday unit of length & distance measurement. Relative to the length & distance base unit, 1 km equals 1000 Meters (m).

About Astronomical Units (AU): Astronomical Unit (AU) is a unit in the Length & Distance measurement category. It is widely used in earth-sun distance (solar system). Relative to the length & distance base unit, 1 AU equals 149597870700 Meters (m).

Need to convert in the opposite direction? Visit our Convert Astronomical Units to Kilometers (AU to km) calculator (1 AU = 149597870.7 km).

Step-by-Step Worked Examples (km to AU)

Convert 5 Kilometers to Astronomical Units: Applying the formula (AU = km × 6.684587122e-9): starting with 5 km, multiply the kilometer value by 6.684587122e-9 to get 0 AU.
Convert 10 Kilometers to Astronomical Units: Applying the formula (AU = km × 6.684587122e-9): starting with 10 km, multiply the kilometer value by 6.684587122e-9 to get 0 AU.
Convert 50 Kilometers to Astronomical Units: Applying the formula (AU = km × 6.684587122e-9): starting with 50 km, multiply the kilometer value by 6.684587122e-9 to get 0 AU.

Popular Length & Distance Conversions

Kilometer ⇄ Mile

Multiply kilometers by ~0.621371 to get miles, or divide miles by 0.621371 to get kilometers.

Inch ⇄ Centimeter

1 inch is legally and scientifically defined as exactly 2.54 centimeters.

Foot ⇄ Meter

1 foot is defined as exactly 0.3048 meters (12 inches).

Mile ⇄ Nautical Mile

1 nautical mile is exactly 1,852 meters (~1.15078 statute miles).

Frequently Asked Questions

Verified answers and formulas for converting kilometers to astronomical units.

How many astronomical units are in 1 kilometer?

There are 0 astronomical units (AU) in 1 kilometer (km). Conversely, 1 astronomical unit equals 149597870.7 kilometers.

How do you convert kilometers to astronomical units?

To convert kilometers (km) to astronomical units (AU), use the formula: AU = km × 6.684587122e-9. Multiply the kilometer value by 6.684587122e-9. For example, 10 km equals 0 AU.

How do I convert back from astronomical units to kilometers?

To convert in the reverse direction from astronomical units (AU) to kilometers (km), use the inverse formula: km = AU × 149597870.7. Multiply the astronomical unit value by 149597870.7 (1 AU = 149597870.7 km).

What is the difference between kilometer (km) and astronomical unit (AU)?

Both kilometer and astronomical unit measure length & distance. Kilometer (km) is a unit in the Length & Distance measurement category. It is a standard everyday unit of length & distance measurement. Relative to the length & distance base unit, 1 km equals 1000 Meters (m). Astronomical Unit (AU) is a unit in the Length & Distance measurement category. It is widely used in earth-sun distance (solar system). Relative to the length & distance base unit, 1 AU equals 149597870700 Meters (m).

How many miles are in a kilometer?

There are approximately 0.621371 miles in 1 kilometer. To convert kilometers to miles quickly in your head, multiply by 6 and divide by 10 (or multiply by 0.6).