I wouldnt go by the normal 8 oz is one cup when it comes to marshmallows. I have a 16 oz bag of regular sized (not Mini) marshmallows here and it says that a normal serving size is 4 pieces and that there are about 15 servings in the bag. There is also a recipe at the top for Whipped Sweet Potatoes which says that 24 Regular sized Marshmallows ia about 3 cups. I would think that would mean that 8 would be about 1 cup. I hope this helps you.