how many calories in a bag of microwave light popcorn
Comparing Calorie Counts. Standard microwave popcorn contains added fats and provides 165 calories per ounce to total 413 calories per 2.5-ounce bag. In comparison, plain, air-popped popcorn contains just 108 calories per ounce, or 270 calories per 2.5 ounces. If you prefer convenience, hope lies in low-fat microwave popcorn, which usually contains 120 calories per ounce, or 300 calories per bag.