Keg Servings Calculator
Find how many drinks a keg pours.
Half barrel = 15.5
Pint = 16 oz
Results update as you type.
How it works
When hosting a party with a keg, this calculator tells you how many drinks it will pour. You enter the keg size in gallons and your serving size in ounces, and it returns the number of servings and the keg's total volume. The math converts gallons to fluid ounces (128 per gallon) and divides by the serving size, rounding down to whole pours. Kegs come in standard sizes: the common half-barrel holds 15.5 gallons, a quarter-barrel (pony keg) 7.75 gallons, and a sixth-barrel (sixtel) about 5.16 gallons, while a mini-keg is 1.32 gallons. Serving size matters a lot: a full 16-ounce pint yields fewer servings than a 12-ounce pour, and real-world servings are usually a bit fewer than the math suggests because of foam and spillage, so the last portion of a keg often produces foamy, partial pours. A half-barrel at 16 ounces theoretically gives 124 servings, but plan for closer to 100 to 120 usable pints allowing for waste. Use this to decide how many kegs to buy for your guest count and drinking duration, comparing the cost per serving against bottles or cans. To estimate how many kegs you need, divide your expected total drinks by the servings per keg. Enter your keg size and serving size to find the number of servings.
Servings = floor(keg gallons × 128 / serving ounces)
A gallon holds 128 fluid ounces, so multiplying the keg's size in gallons by 128 gives its total ounces. Dividing by the serving size in ounces and rounding down gives the number of pours. A standard half-barrel keg holds 15.5 gallons, about 165 pints.
Source:Beverage serving guides
We review all our tools from time to time to ensure accuracy.
Worked example
How to use this calculator
- 1
Enter your values
Enter your values in the fields above.
- 2
Adjust the options
Adjust keg size and serving size if they apply — sensible defaults are already set.
- 3
Read your result
Servings updates instantly as you type — no button to press.
Frequently asked questions
How many drinks are in a keg?
A standard half-barrel keg holds 15.5 gallons, or 1,984 ounces, which is about 124 sixteen-ounce pints or 165 twelve-ounce servings in theory. Real yield is a bit lower due to foam and spillage, so plan for roughly 100 to 120 usable pints. The calculator computes servings from your keg and serving size.
What are the standard keg sizes?
The common sizes are the half-barrel at 15.5 gallons, the quarter-barrel or pony keg at 7.75 gallons, the sixth-barrel or sixtel at about 5.16 gallons, and the mini-keg at 1.32 gallons. Enter your keg's gallon capacity to calculate its servings. The half-barrel is the standard full-size keg most people picture.
Why are real servings fewer than the calculation?
Foam, spillage, and the difficulty of pouring the last portion of a keg mean some beer is lost, so you get fewer clean full pours than the raw volume suggests. Temperature and tap pressure also affect foam. It is wise to plan for roughly 10 to 20 percent fewer servings than the theoretical maximum.
How many kegs do I need for my party?
Estimate the total drinks your guests will have (number of guests times drinks per person over the event), then divide by the usable servings per keg. For example, 60 guests having 4 drinks each is 240 drinks, needing about two half-barrels at roughly 120 usable pints each. Round up to avoid running out.
Is a keg cheaper than bottles or cans?
Often yes, per serving, especially for larger gatherings, since kegs reduce packaging cost. To compare, divide the keg's total price (plus any deposit and tap rental) by its usable servings to get cost per drink, and compare to the per-unit price of bottles or cans. Kegs also cut waste and are convenient for big events.