When you butcher a hog or a pig you'll get around 57% of the pig in meat once butchered.
So if you have a 250 pound pig and you butcher that 250 pound pig you'll get around 144 lbs of meat that you can put into the freezer from that 250 lb pig.
A pig contains around 28% of product that is not edible and it's re- moved during the slaughter and dressing procedure.