📏 Length
km to astronomical units Converter
Convert km to astronomical units instantly with a reference conversion table.
Quick answer: To convert km to astronomical units, multiply by 6.6846e-09. For example, 1 km = 6.6846e-09 astronomical units. Use the calculator below for any value.
km to astronomical units
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Common conversions
| km | astronomical units |
|---|
Formula:
How to convert km to astronomical units
1
Enter your value
Type the number of km you want to convert into the left box. The result in astronomical units appears instantly in the right box. You can also type into the right box to convert in the other direction.
2
Use the swap button
Click the ⇄ Swap button to reverse the conversion — astronomical units to km. Your current value carries across so you don't have to re-enter anything.
3
About km and astronomical units
km and astronomical units are common length measurements.
📊 Common conversions at a glance
| km | astronomical units |
|---|---|
| 1 | 6.685e-09 |
| 1000 | 6.685e-06 |
| 149597871 | 1 |
| 1000000000.0 | 6.685 |
| 1000000000000.0 | 6685 |
| 1000000000000000.0 | 6.685e+06 |
Reviewed for 2026. km ↔ astronomical units conversion factor verified against published reference data. Built by a UK-based qualified primary teacher and FA Level 2 coach as part of 247QuickTools' free utility-tools project.