A half keg, also known as a half barrel keg or full-size keg, holds approximately 15.5 gallons (58.7 liters) of beer. This translates to about:

• 165 beers if each serving is 12 ounces (standard cans or bottles).
• 124 beers if each serving is 16 ounces (pints).

So, you can expect around 165 standard 12-ounce beers in a half keg