How to convert Kilometer to Astronomical unit

Conversion factor and calculation steps from Kilometer (km) to Astronomical unit (au).

Conversion logic

Each unit is defined via the base unit (meter (m)). The value is first converted to the base unit, then to the selected unit.

1 km = 1000 m

1 au = 149597870700 m

1 km × 1000 = 1000 m

1000 m ÷ 149597870700 = 6.68458712e-9 au