About the Units
kilometer (km)
A standard length unit equal to 1000 meters, commonly used for distances.
atomic unit of length (a.u. of length)
A reference unit of length used in quantum mechanics and atomic physics.
Common Conversions
- 1 km = 18897260000000.0 a.u. of length
- 5.2917723e-14 km = 1 a.u. of length