How many beers in a keg?

A keg is about 15.5 gallons.

You should get about 165 12 oz cups from that. And this is from memory. And it is pathetisad that I know this without Google.

You must, must, must use Kegulator. Not only will it calculate how much beer you need, but will also account for random people, spillage, and ice.

actually a full keg is 31 gallons but most people buy a half keg which is 15.5 gallons. I don’t think you can even buy a full keg. There is also a 1/4 keg available. I have a kegarator in my home and I buy a half keg at a time. Which mathmatically gives you 165 12 oz beers but that never happens because there is waste. So for easier math figure on 150 beers per half keg..

A keg is not a measurement, but a way of storing beer. @gooch, you are thinking of the unit of measure known as a barrel. In the United States a barrel of beer is 31 gallons. A half barrel, or what most people think of as a keg, is 15.5 gallons as @gooch mentioned. A gallon is 128 ounces, or 10.67 12oz beers. So a 15.5 gallon keg would hold 165.33 beers… but you’re going to have waste and spillage and foam.

So, @gooch and @johnpowell were both pretty much spot on… I just wanted to clear up the misunderstanding about keg vs. barrel.

UK keg used for carbonated beer (yuk!) is 11 imperial gallons: 88 20oz pints
Traditional cask beer (hooray) comes in several sizes:
Firkin 9 imperial gallons; Kilderkin 18 imperial gallons; Barrel 36 imperial gallons; Hogshead 54 imperial gallons. Like an oil well a brewery’s production is measured in barrels.