About the Units
foot (U.S. survey) (ft (U.S. survey))
A slightly different foot unit used in land surveying.
femtometer (fm)
An ultra-small length unit used in nuclear and particle physics.
Common Conversions
- 1 ft (U.S. survey) = 304800600000000.0 fm
- 3.2808335e-15 ft (U.S. survey) = 1 fm