How Many Gallons in a 15-Pound Propane Tank

A 15-pound propane tank holds about 3.6 gallons of propane when full. Propane tanks are filled to 80% capacity to allow for expansion, so even though the tank may have a larger total volume, only 3.6 gallons of liquid propane is safely stored inside. Propane Tank Size to Gallon Conversion How Long Does a 15-Pound…