Question: how many calories in one serving of longans?
Answer: Nutrition information One ounce of fresh longan has just 17 calories and 4 grams of carbs. One ounce of fresh lychee has 18 calories and 5 grams of carbs. Both dried longan and dried lychee are higher in calories and carbs than their fresh counterparts. One ounce of dried longan has 80 calories and 21 carbs.