What Size Keg Do I Need For A Party?
The size of keg needed for a party depends on the number of guests and their drinking capacity. A good rule of thumb is to estimate that each adult will consume about 2 drinks in the first hour and then 1 drink per hour after that. So, for a small gathering of 20-30 people, a 1/2 barrel keg (which holds approximately 15.5 gallons or 165 12-ounce servings) would be sufficient. For larger parties, multiple kegs or a full-size (1 barrel) keg may be necessary.