The amount of people that a brisket feeds depends on the cooked weight of the meat. Caterers' recommendations vary, but depending on the size of the portions, 1 pound of brisket will feed between two and six people.
The American Heart Association recommends 2- to 3-ounce servings of meat. Using those recommendations, 1 pound of cooked brisket meat would yield five 3-ounce portions or eight 2-ounce portions. Briskets can decrease in weight by as much as half when they are cooked, so it is important to use the weight of the brisket after it is cooked rather than its precooked weight when calculating servings.