Keg Size Converter
Keg Size Converter
Convert between gallons, liters, pints, fluid ounces, and barrel sizes instantly. Whether you're pricing out a keg order for a wedding, planning a tap list, or comparing European versus US keg sizes for import beers, this converter handles all standard formats and shows you how each keg size stacks up.
Unit Converter
| Keg Name | US Gallons | Liters | Fluid Oz | 16oz Pints | 12oz Servings | Full Weight |
|---|---|---|---|---|---|---|
| Half Barrel (1/2 BBL) | 15.5 | 58.67 | 1,984 | 124 | 165 | ~160 lbs |
| Pony Keg (1/4 BBL) | 7.75 | 29.34 | 992 | 62 | 82 | ~87 lbs |
| Sixtel (1/6 BBL) | 5.16 | 19.53 | 661 | 41 | 55 | ~58 lbs |
| 50L European | 13.2 | 50.0 | 1,690 | 106 | 141 | ~137 lbs |
| 30L European | 7.9 | 30.0 | 1,014 | 63 | 84 | ~82 lbs |
| Cornelius / 5 Gal | 5.0 | 18.93 | 640 | 40 | 53 | ~55 lbs |
| Firkin (Cask) | 10.8 | 40.91 | 1,382 | 86 | 115 | ~110 lbs |
| Pin (Cask) | 5.4 | 20.46 | 691 | 43 | 57 | ~58 lbs |
Why keg size matters for your draft system
Choosing the right keg size affects everything from the coupler you need to the cooler space required and the number of pints you can pour. The keg size converter above lets you quickly compare any keg size across all common units — so you can match keg volume to your tap list, event headcount, or storage capacity.
How the keg size math works
The converter uses a single conversion: everything goes to US gallons first, then spreads to every other unit. One US gallon equals 3.78541 liters, 128 fluid ounces, or 8 pints (16 oz). Barrels (BBL) are the standard unit in the draft beer industry — one US barrel equals 31 gallons, which is where the half barrel (15.5 gal) gets its name.
US keg sizes vs European keg sizes
US kegs are measured in barrels (BBL fractions), while European kegs use liters. A half barrel (15.5 gal) is roughly 58.67 liters, while a 50L keg (13.2 gal) sits between a pony keg and a half barrel in volume. The coupler types also differ — US domestic kegs use a D System (US Sankey) coupler, while most European imports use a Type S (European Sankey) coupler. If you're serving a mix of domestic and import beer, you'll need both coupler types and possibly a mixed-gas setup.
Keg weight and handling
A full half barrel weighs about 160 lbs — not something you want to lift alone. Sixtels and Cornelius kegs (5 gallons) are far more manageable at 55–60 lbs, making them popular for home kegerators, small taprooms, and events. A keg dolly is a worthwhile investment if you handle full-size kegs regularly.
Worked example: event planning
Scenario: You're planning a party for 60 people and expect each person to drink 3 beers (180 twelve-oz servings total). A half barrel (1/2 BBL) gives you 165 twelve-oz servings — close but potentially short. A half barrel plus a sixtel adds 55 more servings, giving you 220 total with room to spare. Use the converter above to check different keg combinations.
Frequently Asked Questions About Keg Sizes
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