Pantry Staples
Popped Popcorn (Air-Popped) Conversion
Popped Popcorn (Air-Popped) weighs 8g per US cup.
| Amount | Grams | Ounces |
|---|---|---|
| 1 cup | 8.0 g | 0.28 oz |
| 1/2 cup | 4.0 g | 0.14 oz |
| 1/4 cup | 2.0 g | 0.07 oz |
| 1 tbsp | 0.5 g | 0.02 oz |
| 1 tsp | 0.2 g | 0.01 oz |
| 100 g | 100.0 g | 3.53 oz |
Need a different amount? Use the full Ingredient Converter tool.
Popped popcorn is remarkably light — just 8 grams per cup, among the lowest-density foods on this entire site — because popping transforms a dense, hard kernel into a mostly air structure, with the starch stretched into a thin, brittle web around large pockets of trapped air.
That extreme lightness is exactly why popcorn has such a favorable volume-to-calorie ratio compared to most snack foods — a large bowlful (by volume) contains a genuinely modest amount of actual food mass, which is part of why air-popped popcorn (without butter or oil added) is commonly recommended as a filling, lower-calorie snack option.
Air-popping and oil-popping produce popcorn with a meaningfully different weight-per-cup figure in practice, since oil-popped corn typically retains some of that oil on the surface — this site's 8g figure specifically reflects plain, air-popped popcorn with nothing added, the cleanest baseline for a conversion figure.
Shaking the pot or bag occasionally while popping helps unpopped kernels reach the heat, reducing how many are left at the bottom unpopped.
A sealed container helps popped popcorn stay crisp for a day or two, though it's generally best enjoyed fresh, since its light, airy structure loses crunch fairly quickly once exposed to air.
Caramel corn, made by coating popped popcorn in a cooked sugar syrup, is a genuinely different product from plain popcorn, with the syrup adding both sweetness and a satisfying crunch once cooled and hardened.
Popcorn's status as a whole grain, combined with its low calorie density when air-popped, has made it a popular recommendation in nutrition guidance focused on filling, lower-calorie snacking, a genuinely different profile from most other popular snack foods.
Seasoning popped popcorn while it's still warm helps spices and salt adhere better to its surface than seasoning it once it's cooled, since the residual heat and moisture give dry seasonings something to stick to.
Frequently asked questions
Why does popped popcorn weigh so little per cup?
Popping expands a dense kernel into a structure that's mostly trapped air surrounded by a thin starch web, so a cup by volume contains very little actual mass compared to almost any other food measured by the cup.
Does butter or oil change how much a cup of popcorn weighs?
Yes, somewhat — oil-popped or buttered popcorn retains extra fat on its surface, adding a small amount of weight per cup compared to plain air-popped corn, which is what this site's 8g figure specifically reflects.
How many cups of popped popcorn does one serving typically represent?
Serving sizes vary by context, but a common snack-size reference is around 3 cups popped, which at 8g/cup works out to roughly 24g of actual popcorn material — a genuinely small amount of food by weight for that much bowl volume.
Does microwave popcorn weigh differently per cup than stovetop-popped corn?
Not meaningfully once popped, assuming a similar oil/butter application — the popped starch structure itself weighs about the same regardless of popping method; any weight difference mostly comes from added fat and flavoring, not the method itself.
Is unpopped popcorn a useful ingredient to weigh for a recipe?
Yes — recipes and product packaging more often specify unpopped kernels by weight or volume (since that's the purchasable, storable form), while the popped result is usually described by approximate yield rather than by precise weight.