Question: how many grams in a cup of air popped popcorn?
Answer: And because of its fibre content, popcorn is filling. For example, 8 grams of popcorn, which is roughly one cup, has around 30 calories. However, 8 grams equates to just 7 or eight 8 crisps or 4 chocolate Maltesers, both of which have just over 40 calories.