Question: 1 cup is how many grams of cereal?
Answer: October 1, 2007 at 2:55 p.m. For many cereals (corn flakes, for example), the nutrition label lists 1 cup, which weighs something like 28 grams (about 1 ounce). One of General Mills' new Curves cereals, Whole Grain Crunch, has a serving size of 3/4 cup, or 27 grams.