if i cook an 8 oz piece of chicken raw what will be the portion size when its done

well...the nutritional value should still be the same as what 8 oz of chicken is, shouldn't it?
Well i dont Know becuase when you read diet plans it says like 8 oz cooked chicken i just wanted to know if there was a difference between the raw and cooked versions
couple ounces difference. generally, it loses about 1/4 of it's weight - so 6 ounces. same rule for lean ground beef as well, from what i've noticed anyway.
thanks for the help