Sometimes they tell you a serving is 3/4 a cup, and sometimes they just tell you it's 8 servings. If they don't give you the amount, you basically have to figure out how much 1/8th would be. For example, on spaghetti boxes, it usally says "serves 8." But trying to break spaghetti into 8 servings is nuts. So I try to look up how much one cup would be (200 calories for 1 cup). Many times you need to use your judgement and it's not always easy. Just do the best you can.