Calories in popcorn

USDA data · Updated October 12, 2026

Popcorn (1 cup, 8 g) has 31 calories, with 1 g of protein, 6.2 g of carbohydrates and 0.4 g of fat. Per 100 g, that's 387 kcal.

Values are for Snacks, popcorn, air-popped. Amounts vary with size, variety and preparation.

Popcorn (air-popped)

Per 1 cup (8 g)


Calories31

Protein1 g
Carbohydrates6.2 g
   Fiber1.2 g
   Sugars0.1 g
Fat0.4 g
Sodium1 mg

Source: USDA FoodData Central.

Calories in popcorn by serving

ServingWeightCaloriesProteinCarbsFat
100 g100 g38712.9 g77.8 g4.5 g
1 cup8 g311 g6.2 g0.4 g
1 oz28 g1103.7 g22.1 g1.3 g

Where the calories come from

Protein 13%Carbs 77%Fat 10%

Popcorn (air-popped) has a medium energy density (3.9 kcal per gram). It provides 3.3 g of protein per 100 kcal.

Snacks & fast food: calories compared

Per 100 gCaloriesProteinCarbsFat
Vanilla ice cream2073.5 g23.6 g11 g
Cheese pizza26810.4 g29 g12.3 g
French fries3123.4 g41.4 g14.7 g
Popcorn (air-popped)38712.9 g77.8 g4.5 g
Potato chips5326.4 g53.8 g34 g

Log it in seconds

In C for Calories, photograph your plate and popcorn is estimated along with everything else on it, or search for it and enter the amount in grams. For packaged versions, scan the barcode to use the label.

Source: U.S. Department of Agriculture, Agricultural Research Service. FoodData Central, SR Legacy, FDC ID 167959. Calories are rounded to the nearest whole number and nutrients to one decimal place.

FAQ

Frequently asked questions

How many calories are in popcorn?

31 calories in 1 cup (8 g), or 387 calories per 100 g.

How much protein is in popcorn?

1 g of protein in 1 cup (8 g) (12.9 g per 100 g).

How many carbs are in popcorn?

6.2 g of carbohydrates in 1 cup (8 g), including 1.2 g of fiber.