How many pounds of shredded roast beef for 12 people?

For 12 people, you would generally need about 1/3 to 1/2 pound of shredded roast beef per person, depending on whether it's the main dish or part of a larger meal. Therefore, you should prepare approximately 4 to 6 pounds of shredded roast beef to ensure everyone has enough to eat. If you're serving sides, closer to 4 pounds may suffice; if it's the main dish, aim for 6 pounds.