Astronomical Units (AU)	Kilometers (km)
1 AU	149597870.7 km
2 AU	299195741.4 km
5 AU	747989353.5 km
10 AU	1495978707 km
25 AU	3739946767.5 km
50 AU	7479893535 km
100 AU	14959787070 km
250 AU	37399467675 km
500 AU	74798935350 km
1000 AU	149597870700 km

Convert Astronomical Units to Kilometers

Convert astronomical units to kilometers (AU to km) with our instant calculator. 1 AU = 149597870.7 km. Includes exact formula and reference tables.

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

1 Astronomical Unit (AU) is equal to 149597870.7 Kilometers (km). Multiply the astronomical unit value by 149597870.7

Quick Answer 1 AU = 149597870.7 km

Formula km = AU × 149597870.7

Inverse Factor 1 km = 0 AU

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 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).

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).

Need to convert in the opposite direction? Visit our Convert Kilometers to Astronomical Units (km to AU) calculator (1 km = 0 AU).

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

Convert 5 Astronomical Units to Kilometers: Applying the formula (km = AU × 149597870.7): starting with 5 AU, multiply the astronomical unit value by 149597870.7 to get 747989353.5 km.
Convert 10 Astronomical Units to Kilometers: Applying the formula (km = AU × 149597870.7): starting with 10 AU, multiply the astronomical unit value by 149597870.7 to get 1495978707 km.
Convert 50 Astronomical Units to Kilometers: Applying the formula (km = AU × 149597870.7): starting with 50 AU, multiply the astronomical unit value by 149597870.7 to get 7479893535 km.

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 astronomical units to kilometers.

How many kilometers are in 1 astronomical unit?

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

How do you convert astronomical units to kilometers?

To convert astronomical units (AU) to kilometers (km), use the formula: km = AU × 149597870.7. Multiply the astronomical unit value by 149597870.7. For example, 10 AU equals 1495978707 km.

How do I convert back from kilometers to astronomical units?

To convert in the reverse direction from kilometers (km) to astronomical units (AU), use the inverse formula: AU = km × 6.684587122e-9. Multiply the kilometer value by 6.684587122e-9 (1 km = 0 AU).

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

Both astronomical unit and kilometer measure length & distance. 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). 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).

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).