Question: how many calories in 1 4 cup of air popped popcorn?
Answer: Popcorn Nutrition Facts Air-popped popcorn has only 30 calories per cup; oil-popped popcorn has only 35 calories per cup. When lightly buttered, popcorn contains about 80 calories per cup. Popcorn is a whole grain, making it a good-for-you food.