Some of the links on this forum allow SMF, at no cost to you, to earn a small commission when you click through and make a purchase. Let me know if you have any questions about this.
Are the guests a mix of women, children and men? Or is only going to be hungry men? Is there going to be any other meat served or just the hog? Also, looking to have leftovers?
I have heard rule of thumb to be 1 pound dressed per guest. I believe cooked yield will be around 40% - 50%. So take into consideration what guests will be there, then do a little math and you should be there.