A keg of beer holds about 1,900 fluid ounces. Kegs are also known as half-barrels and contain 15.5 gallons. A full barrel of beer is the equivalent of 31 gallons. A keg produces 124 pints, 165 twelve-ounce servings or approximately seven cases of beer in 12-ounce cans.
The height of a standard keg is just over 23 inches. A keg weighs 160 pounds when full of beer and 27 pounds when empty. Variations of the keg have been introduced over the years. A mini-keg is a 5-litre keg produced for retail sales. Party balls, or beer balls, are disposable plastic balls that contain just over 5 gallons of beer. A quarter-barrel, or pony keg, can hold about 7.75 gallons of beer.