How many beers in a keg?
A full-size half-barrel keg holds 15.5 gallons: about 165 twelve-ounce beers or about 124 pints (KegWorks). A quarter keg holds about 82 twelve-ounce beers and a sixth barrel about 55.
How to work it out
- 165 adults × 100% = 165 beer drinkers × 1 beers (1 + 1 × 0 more hours) = 165 beers
- 165 beers × 12 oz × 1 foam = 15.5 gal ÷ 15.5 gal per keg = 1 keg · best fit with 10% spare: 1 quarter barrel + 2 sixth barrels (193 twelve-ounce pours)
“A keg” usually means the full-size half barrel, the one most beer stores rent for parties. Its size comes from the 31-gallon barrel that federal rules still use as the unit of measure for beer.
Adjust for your project
More options: Beer drinkers · Per hour · Foam
- Or kegs of the size picked above
- 1 keg · half barrel
- Beers to pour
- 165 beers
- Beers per keg at this pour (before foam)
- 165
- Or cases of 24 cans (12 oz, no foam loss)
- 7 cases
- Spare beer in the kegs of the size picked
- 0%
- Beer needed (incl. foam)
- 15.5 gal
- The half barrel count leaves only 0% to spare. A little more thirst than planned and it runs dry — the best fit above adds headroom, or keep a case or two of cans as backup.
- A keg needs to stay cold — in a tub of ice or a kegerator — and a party pump needs a few minutes to settle after the keg is moved. Ask the store which coupler (tap) the keg needs.
Beers per keg and kegs needed, by keg size (guests as above)
| Keg | Beers per keg at this pour (before foam) | Or kegs of the size picked above |
|---|---|---|
| half barrel | 165 | 1 keg |
| quarter barrel | 83 | 2 kegs |
| sixth barrel | 55 | 3 kegs |
| mini keg | 14 | 12 kegs |
From gallons to glasses
Fifteen and a half gallons is 1,984 fl oz. Divided by 12 oz that is 165 beers; by 16 oz, 124 pints. Those are clean pours — KegWorks’ figures, with no allowance for foam. At a party with a hand pump, expect to lose some to foam, especially from the first pitcher after the keg arrives, so plan on roughly 150 twelve-ounce beers from a half barrel.
| Keg | Gallons | 12 oz beers | 16 oz pints | With 10% foam (12 oz) |
|---|---|---|---|---|
| Half barrel | 15.5 | 165 | 124 | about 150 |
| Quarter (pony) | 7.75 | 82 | 62 | about 75 |
| Sixth barrel | 5.16 | 55 | 41 | about 50 |
| Mini keg (5 L) | 1.32 | 14 | 10 | about 13 |
A keg in cases
A half barrel holds the same beer as about 6.9 cases of 24 twelve-ounce cans, a quarter barrel about 3.4 cases, and a sixth barrel about 2.3. That is the comparison to make at the store: a keg means fewer cans to chill and recycle, but it needs ice, a tap and a deposit.
- Keep it cold: a keg in a large tub of ice — a garbage can works — needs topping up through the party.
- Let it settle: a keg that was just driven home pours foam; give it time in the ice.
- Tap: ask the store which coupler fits; party pumps are sold or rented with the keg.
For a whole party, see how many kegs for 100 guests. Ice for the keg tub: how much ice for a 120 quart cooler gives a sense of the volume.
Different size? Use the full Keg & Beer Calculator.
What you’ll need
- Party keg pump (tap)Budget price
A hand-pumped tap for a rented keg. Most US domestic kegs use a D-system coupler; ask the store which one yours needs.
See options on Amazon (opens in a new tab) - Plastic party cups (16 oz)Budget price
Guests lose track of their cup, so plan two or three per person. A marker by the stack helps.
See options on Amazon (opens in a new tab)
As an Amazon Associate we earn from qualifying purchases. Links to products are affiliate links — they cost you nothing extra and help keep these calculators free.
Frequently asked questions
How many beers in a quarter keg?
About 82 twelve-ounce beers or 62 pints in a 7.75-gallon quarter barrel.
How many beers in a sixth barrel keg?
About 55 twelve-ounce beers or 41 pints in a 5.16-gallon sixth barrel.
How many 16 oz beers in a keg?
About 124 pints from a 15.5-gallon half barrel.
Other common sizes
- How many kegs for 100 guests — a half barrel, plus a sixth barrel or cans to spare
Sources
- KegWorks — Guide to beer keg sizes (opens in a new tab) — Half barrel 15.5 gal (about 165 twelve-ounce pours, 124 pints); quarter 7.75 gal (82 / 62); sixth 5.16 gal (55 / 41); Cornelius 5 gal; 5 L mini keg 1.32 gal (about 14 twelve-ounce pours).
- eCFR 27 CFR 25.11 — Definitions: barrel (Cornell LII copy) (opens in a new tab) — A barrel of beer, as a unit of measure, is 31 U.S. gallons.
- NIAAA — What is a standard drink? (opens in a new tab) — One standard drink holds 0.6 fl oz (14 g) of pure alcohol: 12 fl oz of regular beer (about 5%), 5 fl oz of table wine (about 12%), or 1.5 fl oz of distilled spirits (about 40%).
- USDA/HHS — Dietary Guidelines for Americans, 2025–2030 (opens in a new tab) — “Limit Alcoholic Beverages”: consume less alcohol for better overall health; pregnant women, people recovering from alcohol use disorder or unable to control how much they drink, and people on interacting medications should avoid alcohol completely. No daily drink numbers are given.
- CDC — Moderate alcohol use (page dated January 14, 2025) (opens in a new tab) — Defines moderate drinking for adults of legal drinking age as two drinks or less in a day for men and one drink or less for women, citing the 2020–2025 Dietary Guidelines.