One 100 g serving of crustaceans, crab, dungeness, raw has 86 calories, 0.7 g of carbs, and 0 g of fiber.
Full macro and micronutrient breakdown, plus how this compares across diets, is on the Crustaceans, crab, dungeness, raw nutrition facts page.
Source: USDA FoodData Central - SR Legacy (2018-04)