Astronomical Unit to Kilometer Converter
Enter a distance in AU to convert to kilometres and miles.
Result
How to use
- Enter your values in the fields above.
- Press Calculate to see your result instantly.
- Use the Share button to copy a link to your result.
About this calculator
The astronomical unit (AU) was originally the average Earth-Sun distance, and since 2012 the International Astronomical Union has fixed it as an exact constant: 1 AU = 149,597,870.7 km (about 92,955,807 miles), independent of Earth's actual, slightly elliptical orbit.
Astronomers and planetary scientists use AU as the natural yardstick for solar-system distances — Mars sits at roughly 1.5 AU, Jupiter at about 5.2 AU — but need the kilometre figure for orbital mechanics calculations, spacecraft trajectory planning, and comparisons with light-travel-time data.
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