Astronomical units to Kilometres
Type a value in Astronomical units and get the result in Kilometres, calculated exactly.
30 Astronomical units = 4,487,936,121 Kilometres
Precision
Exact factorThis result is exact.
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Formula
km = au × 149,597,870.7
To convert Astronomical units to Kilometres, multiply the value by 149,597,870.7.
Worked examples
- 1 au × 149,597,870.7 = 149,597,870.7 km
- 30 au × 149,597,870.7 = 4,487,936,121 km
- 100 au × 149,597,870.7 = 14,959,787,070 km
This factor is exact by definition.
Conversion table
| Astronomical units (au) | Kilometres (km) |
|---|---|
| 1 | 149,597,870.7 |
| 2 | 299,195,741.4 |
| 3 | 448,793,612.1 |
| 4 | 598,391,482.8 |
| 5 | 747,989,353.5 |
| 6 | 897,587,224.2 |
| 7 | 1,047,185,094.9 |
| 8 | 1,196,782,965.6 |
| 9 | 1,346,380,836.3 |
| 10 | 1,495,978,707 |
| 15 | 2,243,968,060.5 |
| 20 | 2,991,957,414 |
| 25 | 3,739,946,767.5 |
| 30 | 4,487,936,121 |
| 40 | 5,983,914,828 |
| 50 | 7,479,893,535 |
| 60 | 8,975,872,242 |
| 70 | 10,471,850,949 |
| 75 | 11,219,840,302.5 |
| 80 | 11,967,829,656 |
| 90 | 13,463,808,363 |
| 100 | 14,959,787,070 |
Values marked ≈ are rounded; the rest are exact.
Reverse table: Kilometres to Astronomical units
| Kilometres (km) | Astronomical units (au) |
|---|---|
| 1 | ≈ 6.684587122 × 10⁻⁹ |
| 2 | ≈ 1.336917424 × 10⁻⁸ |
| 3 | ≈ 2.005376137 × 10⁻⁸ |
| 4 | ≈ 2.673834849 × 10⁻⁸ |
| 5 | ≈ 3.342293561 × 10⁻⁸ |
| 6 | ≈ 4.010752273 × 10⁻⁸ |
| 7 | ≈ 4.679210986 × 10⁻⁸ |
| 8 | ≈ 5.347669698 × 10⁻⁸ |
| 9 | ≈ 6.01612841 × 10⁻⁸ |
| 10 | ≈ 6.684587122 × 10⁻⁸ |
| 15 | ≈ 0.000000100269 |
| 20 | ≈ 0.000000133692 |
| 25 | ≈ 0.000000167115 |
| 30 | ≈ 0.000000200538 |
| 40 | ≈ 0.000000267383 |
| 50 | ≈ 0.000000334229 |
| 60 | ≈ 0.000000401075 |
| 70 | ≈ 0.000000467921 |
| 75 | ≈ 0.000000501344 |
| 80 | ≈ 0.000000534767 |
| 90 | ≈ 0.000000601613 |
| 100 | ≈ 0.000000668459 |
Unit definitions
- Astronomical units au
- Exactly 149 597 870 700 metres, roughly the mean distance from Earth to the Sun (IAU 2012).
- Kilometres km
- Exactly 1000 metres.
Questions people ask
Astronomical units to Kilometres: what is the conversion factor?
One au is 149,597,870.7 km.
How do I convert Astronomical units to Kilometres?
Use the formula above. For example, 30 au = 4,487,936,121 km.
Is the conversion exact?
Yes. Both units have exact definitions, so the factor is exact; a result is only rounded when its decimals never end.
Factors checked 19 October 2026.