Calories In Seitan Bratwurst Calories: 154, Fat: 2g, Carbs: 6g, Protein: 29g, Fiber: 0g. Calories In beer bratwurst and sauerkraut Calories: 326, Fat: 25g, Carbs: 10g, Protein: 14g, Fiber: 4g. Calories In Bratwurst and Potato Soup Calories: 397, Fat: 26g, Carbs: 25g, Protein: 15g, Fiber: 4g.