IIRC, the FAA requires the # of cabin crew members to be closest to (but not less than) the greater of a 50:1 pax-to-FA ratio or 1 FA per exit.
However, if you don't feel like dealing with that, dividing the max pax load by 50 is a good rule of thumb.
Last edited by N515CR; Dec 4, 2007 at 4:33 pm
Reason: Corrected ratio typo