About the Units
cubic kilometer (km³)
A large volume unit equal to 10^9 cubic meters, used in geological and geographical measurements.
Learn more about cubic kilometers
cubic femtometer (fm³)
An extremely tiny volume unit used in particle physics.
Common Conversions
- 1 km³ = 3.4028237e38 fm³
- 0.0 km³ = 1 fm³