Ingredient Specific Calorie Information From Our Recipes: 1  Calories In Beef Fajitas Calories: 393, Fat: 12g, Carbs: 38g, Protein: 34g, Fiber: 7g. 2  Calories In Beef Fajitas Calories: 218, Fat: 4g, Carbs: 30g, Protein: 17g, Fiber: 4g. 3  Calories In Chili's Style Grilled Beef Fajitas Calories: 235, Fat: 13g, Carbs: 7g, Protein: 24g, Fiber: 1g.