1/2 barrel = 15.5 gallons = 124 pints = 165 12oz bottles - (Full Size Keg)1/4 barrel = 7.75 gallons = 62 pints = 83 12oz bottles (Pony Keg)1/6 barrel (20 Ltr) = 5.2 gallons = 41 pints = 55 12oz bottles (Sixtel)50 Liter = 13.2 gallons = 105 pints = 140 12oz bottles30 liter = 8.1 gallons = 64 pints = 86 12oz bottlesLet us know how many guest you are having and we can help you figure out the rest.