Astronomical Units to Kilometers Converter
Unit ConversionConvert astronomical units (AU) to kilometers using the exact IAU-defined 149,597,870.7 km per AU factor.
Kilometers
Equivalent distance in kilometers
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Frequently Asked Questions
What is an astronomical unit?
An astronomical unit (AU) is the average distance between Earth and the Sun, formally defined by the International Astronomical Union in 2012 as exactly 149,597,870.7 kilometers.
Why is the AU still used alongside kilometers?
The AU keeps distances within the solar system in a convenient, human-readable scale. Mars, for example, sits at roughly 1.5 AU from the Sun rather than about 228 million kilometers.
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