Keg Servings Calculator
How many beers in a keg? Pick a keg size and pour size to get the number of servings, gallons and cost per pour.
How it works
Total ounces = gallons × 128 · Servings = ⌊total ounces ÷ serving size⌋
A US gallon is 128 fluid ounces, so a keg’s serving count is simply its volume in ounces divided by your pour. A half barrel — the classic full-size keg — holds 15.5 gallons, or 1,984 oz, which is about 165 twelve-ounce servings or 124 sixteen-ounce pints. Real-world yield runs a little lower because of foam and the last flat inch, so plan for a few fewer.
Worked example
A 15.5-gallon half barrel is 15.5 × 128 = 1,984 oz. Poured into 16-oz pints that is 1,984 ÷ 16 = 124 servings. In 12-oz cups it stretches to about 165.
Frequently asked questions
How many beers are in a full-size keg?
A half-barrel keg (15.5 gallons) yields roughly 165 twelve-ounce servings or 124 pints, before accounting for foam and waste.
Why do I get fewer beers than the math says?
Foam, over-pouring, and beer left at the bottom typically cost you 5–10% of a keg. The floor-rounded figure here is the theoretical maximum, so buy for a little less.
What size keg should I get for a party?
Estimate total servings the crowd will drink, then match a keg: a sixtel suits about 40 pints, a quarter barrel about 60, and a half barrel over 120.
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This calculator is for educational purposes. Double-check important results before acting on them.