3991 foot pounds equals 1.29 calories.
Convert 3991 foot pounds into joules, kilojoules, megajoules, newton meters, watt hours, kilowatt hours, megawatt hours, mega electrons, etc...
Convert 2 calories into joules, kilojoules, megajoules, newton meters, watt hours, kilowatt hours, megawatt hours, mega electrons, etc...