This amount will vary depending upon how you're serving it. Count on one-third cup of cooked pulled pork per person (think a nice scoop for a slider). Keep in mind that a raw pork butt will shed fat and liquid during the trimming/cooking process, so it's not a straight "every one pound of raw pork will feed three people" calculation. A 4 1/2 pound pork roast will yield roughly 8-10 cooked pulled pork servings.