Interactive tool
Keg yield calculator
A half barrel keg holds 15.5 US gallons — about 165 twelve-oz pours before loss; a quarter barrel (7.75 gal) about 82, a sixth barrel (5.16 gal) about 55, and a Cornelius homebrew keg (5.0 gal) about 53. Those come straight from the published keg volumes. The calculator below applies your own pour size and your own foam-and-spillage figure, with the arithmetic printed in full.
Keg yield calculator
Published volumes — standard keg formats.
12 oz is the standard reference pour; a US pint is 16 oz.
Loss varies with your setup and pouring — set your own figure; 0% is the theoretical maximum.
Pours = 15.5 gal × 128 oz/gal × (1 − 5%) ÷ 12 oz, rounded down — a partial pour is not a pour.
The research behind this tool
Frequently asked questions
How many beers are in a full-size keg?
A half barrel — the standard full-size keg — holds 15.5 US gallons, which is 1,984 ounces: about 165 twelve-oz pours or 124 sixteen-oz pints before any foam or spillage loss. Those are arithmetic on the published volume, not estimates.
What are the standard keg volumes?
Half barrel: 15.5 gallons. Quarter barrel (pony keg): 7.75 gallons. Sixth barrel (sixtel): 5.16 gallons. Cornelius (the homebrew corny keg): 5.0 gallons. These published volumes are the constants the calculator uses — every other number in it is your input.
Why is the waste figure an input instead of a built-in number?
Because real loss depends on your setup — line balance, temperature, how you pour, how often you tap a fresh keg. Publishing one universal "waste percentage" would be a made-up number, so the slider is yours; 0% shows the theoretical maximum.
Does the calculator round down?
Yes — pours are floored to whole servings, because a partial pour at the bottom of the keg is not a serving you can hand to someone.
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