›› Convert astronomical unit to kilometre


›› More information from the unit converter

How many AU in 1 kilometer? The answer is 6.6845871226706E-9.
We assume you are converting between astronomical unit and kilometre.
You can view more details on each measurement unit:
AU or kilometer
The SI base unit for length is the metre.
1 metre is equal to 6.6845871226706E-12 AU, or 0.001 kilometer.
Note that rounding errors may occur, so always check the results.
Use this page to learn how to convert between astronomical units and kilometres.
Type in your own numbers in the form to convert the units!

›› Quick conversion chart of AU to kilometer

1 AU to kilometer = 149597870.691 kilometer

2 AU to kilometer = 299195741.382 kilometer

3 AU to kilometer = 448793612.073 kilometer

4 AU to kilometer = 598391482.764 kilometer

5 AU to kilometer = 747989353.455 kilometer

6 AU to kilometer = 897587224.146 kilometer

7 AU to kilometer = 1047185094.837 kilometer

8 AU to kilometer = 1196782965.528 kilometer

9 AU to kilometer = 1346380836.219 kilometer

10 AU to kilometer = 1495978706.91 kilometer

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You can do the reverse unit conversion from kilometer to AU, or enter any two units below:

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›› Common length conversions

AU to gnat's eye
AU to siriometer
AU to caliber
AU to myriameter
AU to braza
AU to cable
AU to yottameter
AU to fall
AU to bicron
AU to milliare

›› Definition: Astronomical unit

The astronomical unit (AU or au or a.u. or sometimes ua) is a unit of length. It is approximately equal to the mean distance between the Earth and Sun. The currently accepted value of the AU is 149 597 870 691 ± 30 metres (about 150 million kilometres or 93 million miles).

The symbol "ua" is recommended by the Bureau International des Poids et Mesures, but in the United States and other anglophone countries the reverse usage is more common. The International Astronomical Union recommends "au" and international standard ISO 31-1 uses "AU".

›› Definition: Kilometer

A kilometre (American spelling: kilometer, symbol: km) is a unit of length equal to 1000 metres (from the Greek words khilia = thousand and metro = count/measure). It is approximately equal to 0.621 miles, 1094 yards or 3281 feet.

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