How to convert astronomical units to kilometers
km = au × 149,597,870.7Multiply the value in astronomical units by 149,597,870.7. To go the other way, multiply by 6.684587122×10⁻⁹ (or divide by 149,597,870.7).
An astronomical unit is larger than a kilometer: one astronomical unit contains 149,597,870.7 kilometers.
Worked examples
- 1 astronomical unit1 au × 149,597,870.7 = 149,597,870.7 km
- 5 astronomical units5 au × 149,597,870.7 = 747,989,353.5 km
- 10 astronomical units10 au × 149,597,870.7 = 1,495,978,707 km
- 20 astronomical units20 au × 149,597,870.7 = 2,991,957,414 km
- 100 astronomical units100 au × 149,597,870.7 = 14,959,787,070 km
Astronomical units to kilometers conversion table
Values are calculated by the conversion engine and rounded to 8 significant figures.
| Astronomical units (au) | Kilometers (km) |
|---|---|
| 0.1 au | 14,959,787 km |
| 0.25 au | 37,399,468 km |
| 0.5 au | 74,798,935 km |
| 1 au | 149,597,870 km |
| 2 au | 299,195,740 km |
| 3 au | 448,793,610 km |
| 4 au | 598,391,480 km |
| 5 au | 747,989,350 km |
| 6 au | 897,587,220 km |
| 7 au | 1,047,185,100 km |
| 8 au | 1,196,783,000 km |
| 9 au | 1,346,380,800 km |
| 10 au | 1,495,978,700 km |
| Astronomical units (au) | Kilometers (km) |
|---|---|
| 12 au | 1,795,174,400 km |
| 15 au | 2,243,968,100 km |
| 20 au | 2,991,957,400 km |
| 25 au | 3,739,946,800 km |
| 30 au | 4,487,936,100 km |
| 40 au | 5,983,914,800 km |
| 50 au | 7,479,893,500 km |
| 75 au | 11,219,840,000 km |
| 100 au | 14,959,787,000 km |
| 250 au | 37,399,468,000 km |
| 500 au | 74,798,935,000 km |
| 1,000 au | 149,597,870,000 km |
About the units
Astronomical unit (au)
Exactly 149,597,870,700 m (IAU 2012), roughly the average Earth–Sun distance.
Kilometer (km)
One thousand metres. Kilometres measure road distances and running races in most countries; a 10K race is 10 km, about 6.2 miles. One kilometer equals 1,000 meters (m).
Frequently asked questions
How many kilometers are in one astronomical unit?
There are 149,597,870.7 kilometers in one astronomical unit, and this value is exact by definition.
How do I convert astronomical units to kilometers?
Multiply the number of astronomical units by 149,597,870.7. For example, 10 au × 149,597,870.7 = 1,495,978,707 km.
How many astronomical units are in one kilometer?
One kilometer equals 6.684587122×10⁻⁹ astronomical units. That is the reverse factor, 1 ÷ 149,597,870.7.
What is 10 astronomical units in kilometers?
10 au = 1,495,978,707 km.
Is this au to km converter accurate?
Yes. Both units are defined exactly in terms of SI units, so the conversion factor is exact; results are shown to 12 significant figures by default and you can change precision in the converter. Calculations run in your browser using the same tested engine that generated this page.