Orange Nutrition Facts One navel orange (140g) provides 73 calories, 1.3g of protein, 16.5g of carbohydrates, and 0.2g of fat. Oranges are an excellent source of vitamin C, fiber, and potassium. The following orange nutrition information is provided by the USDA.2 Calories: 73 Fat: 0.2g Sodium: 13mg Carbohydrates: 16.5g Fiber: 2.8g Sugars: 12g Protein: 1.3g Vitamin C: 82.7mg Potassium: 232mg Calcium: 60.2mg