Kilometer to Astronomical unit (km → AU)
Convert kilometer to astronomical unit instantly. The conversion factor below is exact by international definition.
Realtime·length·SI
Exact
km
× 0
AU
0.00000001
Precision [auto]
6
📐km to AU formulaExact
AU = km × 6.684587e-9
Inverse: km = AU × 1.495979e+8
Worked example: 1 km = 6.684587e-9 AU
ℹ️About these units
Kilometer (km)
Road distances in most countries.
Astronomical unit (AU)
Source: IAU 2012 definition.
📊Reference table: km → AU
| Kilometer (km) | Astronomical unit (AU) |
|---|---|
| 1 | 0.00000001 |
| 2 | 0.00000001 |
| 5 | 0.00000003 |
| 10 | 0.00000007 |
| 15 | 0.0000001 |
| 20 | 0.00000013 |
| 25 | 0.00000017 |
| 50 | 0.00000033 |
| 100 | 0.00000067 |
| 250 | 0.00000167 |
| 500 | 0.00000334 |
| 750 | 0.00000501 |
| 1,000 | 0.00000668 |
Want a downloadable CSV? Append ?format=csv to the API /api/v1/table endpoint.
🔁Reverse & related
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