This is the Size i'm used to seeing. Below is how much some people got out of it. Not sure if it's accurate or not.
Our keg had served 141 cups of beer at a cost of 62� each.
141 cups is enough for an awesome 7-story byramid!
A similar quantity of beer in cans requires 6� cases, or 165 cans of beer.
Beer sold in cans is about 50% more expensive, but those cans are a hellovalot easier to sneak into traffic school.
haha i got a neg rep for this post.