A typical serving of popcorn (1 cup, popped, 8 g) has about 31 calories. Per 100 g: 387 kcal, 12.9 g protein, 77.8 g carbs, 4.5 g fat. The same 100 g carries 14.5 g of fiber and 0.9 g of sugar. Most of the energy comes from carbohydrate.
| Serving | Weight | Calories |
|---|---|---|
| 1 cup, popped | 8 g | 31 kcal |
| 3 cups, popped | 24 g | 93 kcal |
| 1 oz | 28 g | 110 kcal |
| 100 g | 100 g | 387 kcal |
Air does the inflating: three full cups of plain popcorn cost about 93 calories. On the energy-density scale, 387 kcal per 100 g puts popcorn at the high end. Fiber is the standout at 14.5 g per 100 g, which slows a portion down more than the calorie count suggests.
A typical serving (1 cup, popped, 8 g) has about 31 calories, and 100 g has 387 kcal. Calories scale with weight, so double the portion means double the number.
There are 12.9 g of protein in 100 g of popcorn, which works out to about 1 g per serving (1 cup). Treat it as an energy source rather than a protein source.
There are 77.8 g of carbohydrate per 100 g of popcorn, or about 6 g in 1 cup (8 g).
Every value on this page comes from USDA FoodData Central, entry 167959 (SR Legacy). Serving figures are converted from the per-100-g data, so rounding can shift a total by a calorie or two.
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Get JoulesA note on accuracy: calculators like this one provide estimates based on population-level formulas — your real needs vary with genetics, muscle mass, medical conditions, and more. Results are for information only and are not medical advice, a diagnosis, or a prescription. Talk to a doctor or registered dietitian before making significant changes to your diet or exercise, especially if you have a health condition, are pregnant, or are under 18.
Nutrition data: USDA FoodData Central, FDC ID 167959 (SR Legacy). Serving calories are computed from the per-100-g values.
