“This type of keg contains 15.5 gallons, which is equivalent to 1,984 fluid ounces. If you figure a 12-ounce portion—a typical can or bottle of American beer—you get around 165 beers per ...

which is technically called a half-barrel keg (more on that in a second), you're looking at about 15.5 gallons worth of beer. And in terms of pints, 15.5 gallons ends up being a lot of servings.