In a standard 15.5 gallon half-barrel keg, there will be approximately 141.7 "pints", with the proviso that almost all pub "pints" are actually 14 ounces, not 16. The variation in the exact number of pub pints is caused by normal usage, which includes the dumping of the excess foam that accompanies first opening the keg and the final pours as the keg runs out. There is also, inevitably, a small quantity of beer left in the "empty" keg, which cannot be sucked into the tap for serving. That can frequently be a couple of quarts or more. To pour the actual 141.7, you'd have to waste zero and manage to get out the dregs, something which is, for practical purposes, not possible.
The average number of available, viable pub pints in a barrel runs about 128 to 132 pints.
WARNING: there are a lot of pubs that, because of the recession or just plain greed, are going to a "pint" glass that holds less than a standard 14 oz. pour. 12 ounce "pints" are not unheard of. A standard pub glass can be called a pint because its actual capacity, filled to the very rim, is 16 ounces. The "new pint" looks very much like the old one but is about a half-inch shorter. A standard pub pint glass will be 5 7/8" tall and 3 1/8" diameter at the rim. Anything different will have a different capacity, usually smaller.
The 14 oz. pour is not about greed, BTW. It allows room at the top for the head, without which beer doesn't seem nearly as enticing.
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One keg of beer, also known as a 1/2 barrel, serves 165 12-ounce bottles or cans of beer. This is equal to 6.8 cases of 12 ounce cans or bottles.