fiber one cereal how many ounces in a box
Making the world better, one answer at a time. The serving size for a 18 ounce box of cereal will vary depending on what type of cereal it is. An average box of can range from 15 to 18 servings. The serving size for a 18 ounce box of cereal will vary depending on what type of cereal it is. An average box of can range from 15 to 18 servings. Minor edit?