A standard US 1/6 keg holds 5.16 gallons (approx. 41 pints) of beer or 2 ½ case of beer (60 beers).
A standard sixth barrel keg (⅙ barrel) have become increasingly popular because many craft brewers offer their small-batch experiments only in kegs of this size.
Furthermore, many beer-minded restaurateurs that want to offer their customers a wide variety will opt for Sixth Barrel Kegs because they take up less space than their bigger brothers.
If you opt for a dual-tap kegerator in your home, you’ll likely end up having many different brews offered in sixth barrel kegs because you can fit two of these in one standard kegerator cabinet.
See KegWorks.com's Guide to Beer Keg Sizes to know about the different keg sizes offered on the market today.
Tip! CraftBeer.com shares 4 Things to Consider Before Buying a Kegerator.