All foods Watermelon Fruits Nutrition per 100 g Raw fruit Raw fruit Nutrient Amount per 100 g Calories 35.4 kcal Protein 0.69 g Available carbohydrates 8.33 g Sugars 7.9 g Fibre 0.5 g Water 91 g Potassium 100 mg Magnesium 11 mg Iron 0.16 mg Vitamin C 4.26 mg Source Ciqual 2025 ยท Food code 13036: Watermelon, flesh without skin, without seeds, raw.