| Quick Answer A standard half-barrel keg (the most common type) holds 15.5 gallons of beer, which equals approximately 165 12-ounce servings or about 124 16-ounce pints. Smaller keg sizes hold proportionally less: a quarter-barrel holds about 82 servings, and a sixth-barrel holds about 55 servings. |
Knowing how much beer is in a keg before your event means the difference between running out early and having half a keg left over. Here is every standard keg size and how many guests each one serves. If you are using an air-pump tap like the Kegr, this planning matters even more since the keg should be finished the same day it is tapped.
Keg Sizes: Full Breakdown
| Keg Type | Gallons | Fluid Ounces | 12 oz Pours | Common Name |
| Half-barrel | 15.5 | 1,984 | ~165 | Full keg / standard keg |
| Quarter-barrel | 7.75 | 992 | ~82 | Pony keg |
| Sixth-barrel | 5.16 | 661 | ~55 | Sixtel |
| Slim quarter | 7.75 | 992 | ~82 | Tall quarter |
| 50-liter (import) | 13.2 | 1,689 | ~140 | Euro keg |
How Many Kegs Do You Need for Your Event?
A reasonable estimate for a party with moderate drinkers is 2 to 3 beers per person per hour for the first couple of hours, tapering to about 1 beer per hour after that. For a 4-hour event, budget roughly 6 to 8 beers per person.
If you are using an air-pump tap like the Kegr, plan conservatively. It is better to run slightly short than to have a half-full keg that will not keep after the event.
| Guests | 4-Hour Event | 6-Hour Event | Recommended Keg |
| 10 to 20 | 60 to 120 beers | 80 to 160 beers | Quarter-barrel or half-barrel |
| 20 to 40 | 120 to 240 beers | 160 to 320 beers | 1 to 2 half-barrels |
| 40 to 75 | 240 to 450 beers | 320 to 600 beers | 2 to 4 half-barrels |
| 75 to 100 | 450 to 600 beers | 600 to 800 beers | 3 to 5 half-barrels |
What Is the Most Common Keg Size?
The half-barrel (15.5 gallons) is the most common keg size at retail. Most liquor stores, beer distributors, and grocery stores that sell kegs carry the half-barrel as their default. Quarter-barrels (pony kegs) are the second most common and a popular choice for smaller gatherings.
What Keg Sizes Work With the Kegr?
The Kegr is compatible with any keg that uses a standard Sankey D coupler, regardless of size. This includes half-barrels, quarter-barrels, sixth-barrels, and slim quarters, as long as they use the Sankey D connection that is standard for most domestic US beers and many imports.
If you are unsure what coupler type your keg uses, ask your beer distributor before purchasing.
How Much Does a Keg Cost?
Keg prices vary by brand, region, and retailer. General price ranges for a half-barrel keg:
- Domestic light lager (Bud Light, Coors Light, Miller Lite): $90 to $140 plus deposit
- Domestic premium (Budweiser, Yuengling): $110 to $160 plus deposit
- Craft beer half-barrel: $150 to $300 plus deposit
Most retailers charge a keg deposit of $30 to $100 refunded when you return the empty keg.
Is It Cheaper to Buy a Keg or Cases?
In most cases, buying a keg is significantly cheaper per ounce than buying cases of cans or bottles. A half-barrel of a major domestic brand works out to roughly $0.50 to $0.85 per 12-ounce serving, compared to $1.00 to $1.50 per can or bottle from a case. The savings are most significant for larger groups where you would otherwise be buying many cases.
Frequently Asked Questions
How many 12-ounce beers are in a half-barrel keg?
A standard half-barrel keg holds approximately 165 12-ounce beers. That works out to about 13.75 cases of beer.
What is a pony keg?
A pony keg is another name for a quarter-barrel keg. It holds 7.75 gallons, or approximately 82 12-ounce servings. It is about half the size of a standard keg and a popular choice for smaller gatherings.
What is a sixtel keg?
A sixtel (sixth-barrel) keg holds 5.16 gallons, or approximately 55 12-ounce servings. Sixtels are popular at craft beer bars because their slim profile allows multiple kegs to fit side by side in a standard kegerator.
Should I get a bigger or smaller keg if I am using an air-pump tap?
Size conservatively. An air-pump tap including the Kegr introduces air into the keg, so beer should be finished the same day it is tapped. A keg that is a little too small is better than one that is half-full at the end of the night.
Does the Kegr work with all keg sizes?
Yes. The Kegr works with any Sankey D coupler keg regardless of volume, from a sixtel to a full half-barrel.