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KM to AU Converter

Convert kilometers to astronomical units with accurate formulas, examples and conversion tables.

Length conversion

Calculator

Results update instantly. Use Calculate to confirm the current conversion.

Decimals and negative values are supported.

Result

6.68458712e-9 AU

1 km ≈ 6.68458712e-9 AU

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Open a focused converter for a commonly searched length conversion.

Centimeters to Inches1 cm = 0.39370079 inInches to Centimeters1 in = 2.54 cmMeters to Feet1 m = 3.2808399 ftFeet to Meters1 ft = 0.3048 mKilometers to Miles1 km = 0.62137119 miMiles to Kilometers1 mi = 1.609344 kmMillimeters to Inches1 mm = 0.03937008 inInches to Millimeters1 in = 25.4 mmYards to Meters1 yd = 0.9144 mMeters to Yards1 m = 1.0936133 yd

Conversion table

Common kilometers to astronomical units values, generated from the selected units.

kilometers (km)astronomical units (AU)
1 kilometer6.68458712e-9 astronomical units
5 kilometers0.00000003 astronomical units
10 kilometers0.00000007 astronomical units
20 kilometers0.00000013 astronomical units
50 kilometers0.00000033 astronomical units
100 kilometers0.00000067 astronomical units

Conversion Formula

Divide the value in kilometers by 149597870.7 to get astronomical units.

FormulaAU = km ÷ 149597870.7

Example

Convert 1 kilometer to astronomical units:

1 ÷ 149597870.7= 6.68458712e-9 AU

Unit information

Concise reference information for the selected source and target units.

Kilometer (km)

Metric
1 km = 1,000 m
Definition
One kilometer equals exactly 1,000 meters.
Usage
Used for road distances, geography, travel, and outdoor sports.

Astronomical unit (AU)

Scientific
1 AU = 149,597,870,700 m
Definition
One astronomical unit equals exactly 149,597,870,700 meters.
Usage
Used for distances within the solar system.
KM to AU tableReference chart and common kilometer-to-astronomical unit values.Astronomical units to KilometersConvert astronomical units to kilometers.Kilometers to MillimetersConvert kilometers to millimeters.Kilometers to CentimetersConvert kilometers to centimeters.Kilometers to MetersConvert kilometers to meters.Kilometers to InchesConvert kilometers to inches.Kilometers to FeetConvert kilometers to feet.Kilometers to YardsConvert kilometers to yards.

Frequently asked questions

How many astronomical units are in 1 kilometer?

1 kilometer equals 0.000000006685 astronomical units.

How do you convert kilometers to astronomical units?

Divide the value in kilometers by 149597870.7 to get astronomical units. The formula is AU = km ÷ 149597870.7.

What is 10 kilometers in astronomical units?

10 kilometers is approximately 0.00000007 astronomical units.