Figure about 1 pound/450 grams per person to be on the safe side for bigger eaters as a main course. A bit less if you are serving the wings with a few sides. Generally 4-5 wings per person. So 4 lbs/1.8 kg of wings will serve 4-6 people for a main or 8-10 as an appetizer. This means 16-20 whole wings in total, depending on the size of the wings. (Or 32-40 pieces if split).