How Many Carbs in Popcorn?

The number of carbs in popcorn will vary based on the size portion you eat. For microwave popcorn 1 oz will be 20.8 grams of carbohydrates. If you are on a low calorie diet then popcorn in moderation is a good choice as one cup has 122 calories. If you are on a low carb diet then popcorn probably isn’t the best choice for you.