One 100 g serving of snacks, popcorn, air-popped has 387 calories, 77.8 g of carbs, and 14.5 g of fiber.
Full macro and micronutrient breakdown, plus how this compares across diets, is on the Snacks, popcorn, air-popped nutrition facts page.
Source: USDA FoodData Central - SR Legacy (2018-04)