A good rule of thumb is 6 oz of cooked pulled pork per person (which can go up or down depending on the person’s appetite, but 6 oz is average). As you cook pork (or any meat), it loses weight as the water is released and cooked away. Basically you want to double the amount of cooked pork, and that’s how much raw pork you need. So for a party of 10 people, you'd want 60 oz of cooked pork, which means you'll want 120 oz of raw pork (equates to roughly 7.5 lbs).