Convert astronomical units to kilometers
1 au = 149597870.7 km — exactly. Both units are defined against the SI, so this factor is a fraction, not an approximation.
149 597 870.7km
Exact decimal: 149597870.7
As a fraction: 1495978707/10
1 au = 149597870.7 km
How to convert astronomical units to kilometers
Multiply the number of astronomical units by 149597870.7 to get kilometers.
The exact factor is 149597870.7 — as a fraction, 1495978707/10.
Astronomical unit: Fixed at exactly 149 597 870 700 m by the IAU in 2012.
Astronomical unit to Kilometer conversion table
| Astronomical units (au) | Kilometers (km) |
|---|---|
| 1 au | 149 597 870 |
| 2 au | 299 195 740 |
| 3 au | 448 793 610 |
| 5 au | 747 989 350 |
| 10 au | 1 495 978 700 |
| 20 au | 2 991 957 400 |
| 25 au | 3 739 946 800 |
| 50 au | 7 479 893 500 |
| 100 au | 14 959 787 000 |
| 250 au | 37 399 468 000 |
| 500 au | 74 798 935 000 |
| 1000 au | 149 597 870 000 |
Kilometer to Astronomical unit conversion table
| Kilometers (km) | Astronomical units (au) |
|---|---|
| 1 km | 6.6845871e-9 |
| 2 km | 1.3369174e-8 |
| 3 km | 2.0053761e-8 |
| 5 km | 3.3422936e-8 |
| 10 km | 6.6845871e-8 |
| 20 km | 0.000 000 133 691 74 |
| 25 km | 0.000 000 167 114 68 |
| 50 km | 0.000 000 334 229 36 |
| 100 km | 0.000 000 668 458 71 |
| 250 km | 0.000 001 671 146 8 |
| 500 km | 0.000 003 342 293 6 |
| 1000 km | 0.000 006 684 587 1 |
Frequently asked
How many kilometers are in a astronomical unit?
One astronomical unit equals 149597870.7 kilometers (au → km). That figure is exact, not rounded.
How do you convert astronomical units to kilometers?
Multiply the number of astronomical units by 149597870.7 to get kilometers.
What is 1 km in astronomical units?
One kilometer is 6.684587122e-9 astronomical units.
What is 10 au in km?
10 au = 1 495 978 700 km.
What exactly is a astronomical unit?
Fixed at exactly 149 597 870 700 m by the IAU in 2012.