Byrdo, Here's something someone gave me some time ago:
HOW MUCH MEAT?
For pulled pork, a typical sandwich (or serving) is 4 oz of cooked meat. For adult males, you might want to plan on 2 sandwiches per person. For women and children, plan on one sandwich per person. The average butt loses about 40% of its weight while cooking. So, to get 6 pounds of cooked pork (24 sandwiches) you would need to start with 10 pounds of butt (2.4 servings per LB of uncooked meat). So a simple little formula is all you need:
Number of men (men or large eaters)= M
Number of women and children (lighter eaters)= W
Pounds of Butt to buy = B
So if there 5 men and 5 women,
B=(2*5+5)/2.4 =15/2.4 = 6.25 Pounds[p]