Generally, the medium-sized grapefruit weighs about 2 kg. After peeling off the skin and endothelium, the edible part is about 1 kg. While 100 grams of grapefruit has a calorie of 38 calories, a grapefruit has 500 grams, and the calorie is 190 calories. The calorie of a bowl of rice is about 145 kcal, so the calorie of a grapefruit is equivalent to 1.3 bowl of rice. If you consume the heat of a grapefruit through basketball, it will take 60.7 minutes to consume it.