What Size Is A Beer Keg?
A beer keg comes in different sizes, but the most common is the standard size, which holds 15.5 gallons (58.67 liters) of beer. This size is also known as a half-barrel keg and can hold about 165 12-ounce cups of beer. Other sizes include the quarter keg (7.75 gallons) and the slim quarter keg (5.16 gallons).