Astronomical Unit to Kilometer Converter

About this conversion

The astronomical unit (au) is a unit of length in the astronomical, commonly used for distances between planets and orbital radius of planets. The kilometer (km) belongs to the metric (SI) and is typically found in measurements related to road and highway distances and geographic measurements. By definition, one astronomical unit is approximately 149,597,870.7 km — the mean distance from Earth to the Sun. One kilometer is one thousand meters. The conversion factor between these two units is 149597870.7: multiplying any value in au by this number gives the equivalent in km. For example, 10 au equals 1495978707.0000 km. Going the other direction, 1 km equals 0 au. Adopted alongside the metric system, the kilometer became the standard unit for land distance in most countries by the 20th century.