The answer depends entirely on which keg you mean. Bars and breweries use several different keg sizes, and each one holds a different number of standard 12 ounce beers. Here is the full breakdown, from the half barrel behind most bar counters to the 5 gallon Cornelius keg homebrewers use.
Keg Sizes and How Many Beers Each One Holds
All figures below assume a standard 12 ounce serving with no waste from foam or spillage, which is the number most kegerator calculators use as a baseline.
| Keg Size | Volume | 12 oz Beers | 16 oz Pints |
|---|---|---|---|
| Full barrel (rare in the US) | 31 gallons | about 330 | about 248 |
| Half barrel (standard keg) | 15.5 gallons | about 165 | about 124 |
| Quarter barrel (pony keg) | 7.75 gallons | about 82 | about 62 |
| Slim quarter barrel | 7.75 gallons | about 82 | about 62 |
| Sixth barrel (sixtel) | 5.16 gallons | about 55 | about 41 |
| Cornelius keg (corny keg) | 5 gallons | about 53 | about 40 |
| European 50L keg | 13.2 gallons | about 141 | about 106 |
The Half Barrel Is the One Most People Mean
When someone says “a keg” without specifying, they almost always mean the half barrel, the standard 15.5 gallon keg used at most American bars and the one rented most often for parties. It holds about 165 twelve ounce beers, or 124 pints, and weighs around 160 pounds full.
The quarter barrel, often called a pony keg, is the size most commonly rented for smaller home parties since it is easier to carry and fits into a normal refrigerator or ice tub. It holds about half of what a half barrel holds.
Why the Corny Keg Is Different
A Cornelius keg, or corny keg, was not originally designed for beer at all. It started as a soda syrup container, which is why homebrewers favor it: it is smaller, easier to clean, and uses simple ball-lock or pin-lock fittings rather than the specialized coupler a commercial keg needs. At 5 gallons, it matches the batch size of most homebrew recipes almost exactly, including our Mexican Lager recipe and our Hefeweizen recipe.
Figuring Out How Much Beer You Actually Need
A rough planning rule for a party is 1 to 2 beers per person per hour for the first few hours, tapering off after that. For a 4 hour party with 40 guests averaging 4 beers each, that is 160 beers, close enough to a full half barrel that most people round up and get one.
If you are choosing between kegs and cans for a smaller gathering, our Best Gas Station Beers guide covers 16 widely available options if a keg is more commitment than the event needs.
FAQs
How many 12 packs equal a half barrel keg?
A half barrel holds about 165 twelve ounce beers, which works out to almost exactly 13.75 twelve packs, or 14 twelve packs if you round up to be safe.
How long does a tapped keg stay fresh?
A properly refrigerated keg on CO2 pressure stays fresh for 1 to 2 months unopened, and about 2 to 3 weeks once tapped, since oxygen exposure begins as soon as it is hooked up to a tap system.
What size keg fits in a standard kegerator?
Most home kegerators are built around the quarter barrel and sixth barrel sizes. A half barrel typically needs a larger, dedicated kegerator or a chest freezer conversion, since its 23 inch height and 160 pound full weight do not fit most standard units.
