How many astronomical unit 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:

astronomical unit or
kilometer

The SI base unit for **length** is the metre.

1 metre is equal to 6.6845871226706E-12 astronomical unit, 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!

1 astronomical unit to kilometer = 149597870.691 kilometer

2 astronomical unit to kilometer = 299195741.382 kilometer

3 astronomical unit to kilometer = 448793612.073 kilometer

4 astronomical unit to kilometer = 598391482.764 kilometer

5 astronomical unit to kilometer = 747989353.455 kilometer

6 astronomical unit to kilometer = 897587224.146 kilometer

7 astronomical unit to kilometer = 1047185094.837 kilometer

8 astronomical unit to kilometer = 1196782965.528 kilometer

9 astronomical unit to kilometer = 1346380836.219 kilometer

10 astronomical unit to kilometer = 1495978706.91 kilometer

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

astronomical unit to nanometer

astronomical unit to ell

astronomical unit to light-year

astronomical unit to light-hour

astronomical unit to smoot

astronomical unit to myriameter

astronomical unit to kilofoot

astronomical unit to Q

astronomical unit to light-second

astronomical unit to vershok

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".

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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