How Much Roast Beef Do You Need Per Person?

A peeled beef tenderloin requires about 1/3 pound per person. A New York strip, sirloin or top roast requires about 1/2 pound per person. Each serving equates to about 3 ounces of cooked meat per person, which is the recommended serving size. For holiday functions, it is important to cook more than needed to account for seconds helpings.