A 3.5 ounce portion, which is 100 grams, of persimmon contains 127 calories. With 1.3 calories per gram, the persimmon is considered a lowenergy dense food, which means it is low in calories compared to its weight in grams. Eating a diet filled with lowenergy dense foods like the persimmon helps you keep your calorie intake low while still keeping you full, which is a good way to lose weight.