A half keg, also known as a half-barrel, contains 15.5 gallons of beer. This equates to 165 12-ounce cans (a full barrel holds 31 gallons, or 330 12-ounce cans). This standard size is commonly used for parties, events, and dispensing draft beer in bars and restaurants.
Understanding this standard volume is crucial for event planning, inventory management, and accurate pricing in the hospitality industry. Knowing the capacity allows organizers to estimate the number of servings available and ensures efficient stock control. Historically, standardized keg sizes emerged with the industrialization of brewing to streamline production, distribution, and sales. This standardization simplifies ordering and minimizes discrepancies in quantity across the industry.