The calorie content in a lemon differs based on whether it is peeled or unpeeled. It also depends on the size and the way it is consumed. Lemon A small lemon without peel has 13 calories, a medium sized lemon without peel has 17 calories and a medium sized lemon with peel contains 22 calories. A large lemon without peel has 24 calories whereas an equal sized lemon with peel has 28-30 calories. There are 3 calories in one quarter of a small lemon, 4 calories in a one-fourth inch thick lemon slice without peel, 3 calories in one tablespoon grated lemon peel, 6 calories in every ounce of lemon with peel, 8 calories in every ounce of lemon without peel and 61-65 calories in a cup of lemon juice.
Two of the calories in a medium sized lemon without peel come from fat. An equal quantity of lemon with peel has 22 calories out of which three of these come from fat. Lemon is also a good source of Vitamins and Minerals. Both peeled as well as unpeeled lemons have a good amount of Vitamin C in them. An average sized lemon with peel has around 39% of your daily Vitamin C value; it has 7% of the daily value of calcium and around 4% of the daily value of Iron. An equal quantity of lemon without peel has around 51% of the daily value of Vitamin C, 2% of the daily value iron and 2% of the daily value of Calcium. Lemon does not have any cholesterol content.
Lemon also has small amount of carbohydrates, sugar, potassium, dietary fiber and sodium which varies in peeled and unpeeled lemons. A peeled lemon has 5.41 grams carbohydrates, 1.45 grams sugar, 80 mg potassium, 1 mg sodium and 1.6 grams of dietary fiber where as an unpeeled lemon contains 11.56 grams of carbohydrates, 3 mg sodium, 157 mg potassium, 3 mg sodium and 5.1 grams dietary fiber.