Carol of Black Mountain North Carolina would like to know, how many calories are in watermelon rind? Watermelon rind is a very low calorie food source. One cup of fresh cubed skinless watermelon will generally contain 30 calories total, but that is only if there is no pink watermelon flesh attached to the rind. The watermelon flesh though low calorie as well, tends to have slightly more calories in it than the watermelon rind alone. So there you have it, watermelon rind is the perfect diet food, as it's low in calories and packed full of essential vitamins and minerals. The next time you consider eating a light garden salad with ice lettuce, consider having a watermelon rind salad instead, as your body will just love you for it. We would like to thank Carol for submitting her question. Please feel free to send us any further questions that you might have.