Gallon-atmosphere (US) to foot-pounds force conversion calculator above calculates how many foot-pounds force are in 'X' gallon-atmosphere (US) (where 'X' is the number of gallon-atmosphere (US) to convert to foot-pounds force). In order to convert a value from gallon-atmosphere (US) to foot-pounds force (from gal atm to ft lbf) type the number of gal atm to be converted to ft lbf and then click on the 'convert' button.