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Convert kilometer to astronomical unit
Convert kilometer to astronomical unit with a verified formula, worked example, conversion table, precision guidance, and reverse conversion.
kilometer to astronomical unit
kilometer to astronomical unit
Quick answer
1 kilometer = 6.68458712267E-9 astronomical unit.
Formula
astronomical unit = kilometer × 6.684587122670598840976921669e-9
Precision
The stored factor is used at full decimal precision; round only the displayed result to the precision required by the task.
How to convert kilometer to astronomical unit
- Enter a value in kilometer.
- Scale the source number by 6.684587122670598840976921669e-9 to express the same quantity in astronomical unit.
- Round the displayed astronomical unit value only when needed.
About these units
kilometer is a unit used in length conversions. Length measures distance or linear extent. Its recorded symbol is km. astronomical unit is a unit used in length conversions. Length measures distance or linear extent. Its recorded symbol is AU, UA.
Explore related conversions
kilometer to astronomical unit conversion table
| kilometer | astronomical unit |
|---|---|
| 0 kilometer | 0e-36 astronomical unit |
| 1 kilometer | 6.68458712267e-9 astronomical unit |
| 5 kilometer | 3.34229356134e-8 astronomical unit |
| 10 kilometer | 6.68458712267e-8 astronomical unit |
| 25 kilometer | 1.67114678067e-7 astronomical unit |
| 100 kilometer | 6.68458712267e-7 astronomical unit |
Frequently asked questions
How do I convert from kilometer to astronomical unit?
Scale the source number by 6.684587122670598840976921669e-9 to express the same quantity in astronomical unit.
What formula does CalculatorHQ use for kilometer to astronomical unit?
astronomical unit = kilometer × 6.684587122670598840976921669e-9
How should I round the result?
The stored factor is used at full decimal precision; round only the displayed result to the precision required by the task.
Can I convert astronomical unit back to kilometer?
Yes. Use the linked reverse conversion, whose formula is validated against this pair with round-trip tests.