Feet In A Fathom. 40 feet = 6.6667 fathom: 4 feet = 0.6667 fathom: Web how to convert fathoms to feet [ftm to ft]:. How many feet in a fathom: Officially, a fathom measures six feet (1.8 meters) in length, although some. Web fathom comes to us from old english fæthm, meaning “outstretched arms.” the …