About the Units
megameter (Mm)
A length unit equal to 10^6 meters.
femtometer (fm)
An ultra-small length unit used in nuclear and particle physics.
Common Conversions
- 1 Mm = 1e21 fm
- 1e-21 Mm = 1 fm
Convert from megameters to femtometers
Conversion Information
To convert from megameters to femtometers, multiply by 1e21
1 Mm = 1e21 fm