Help a sister out! :) I'm so confused.

I have Special K original crisp rice cereal. On the side, it says 1 serving is 1 cup (or 31 grams). Just for the heck of it, I scooped up roughly 1 cup of cereal and measured it. It only weighed 21 grams. So I added the proper amount needed to get to 31 grams.

Even though the measurement simply said 1 cup, would it still be equivalent to the given nurtritional information of the cereal if 31 grams was a bit more than a cup? Haha, do you see my dilemma? Thank you very much! :)

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