— J.K., Spearfish, South Dakota. There are about 7 g of protein in 1 ounce of cooked meat. So, for example, 4 ounces of raw boneless skinless chicken breast yields about 3 ounces of cooked chicken, or 21 g of protein.Most healthy adults need about 0.8 g of protein per kilogram of body weight.o, for example, 4 ounces of raw boneless skinless chicken breast yields about 3 ounces of cooked chicken, or 21 g of protein. Most healthy adults need about 0.8 g of protein per kilogram of body weight.