Calories in an apple.
52 kcal per 100 g.
Apples are about 86% water, which is why a medium apple (~180 g) is under 100 kcal. Nearly all of the calories are carbohydrate — roughly 10 g of sugar per 100 g plus 2.4 g of fiber.
Apples, raw, with skin (Includes foods for USDA's Food Distribution Program) · SR Legacy (2018-04) · USDA FDC 171688
Nutrition for your portion
| Nutrient | Per 100 g | 100 g |
|---|---|---|
| Energy | 52 kcal | 52 kcal |
| Protein | 0.26 g | 0.26 g |
| Carbohydrates | 13.8 g | 13.8 g |
| Fat | 0.17 g | 0.17 g |
| Fibre | 2.4 g | 2.4 g |
| Sugars | 10.4 g | 10.4 g |
| Saturated fat | 0.03 g | 0.03 g |
| Sodium | 1 mg | 1 mg |
| Salt (calculated from sodium) | 0.0025 g | 0.0025 g |
| Vitamin A (RAE) | 3 ug | 3 ug |
| Vitamin D (D2 + D3) | 0 ug | 0 ug |
| Vitamin E (alpha-tocopherol) | 0.18 mg | 0.18 mg |
| Vitamin K (phylloquinone) | 2.2 ug | 2.2 ug |
| Vitamin C | 4.6 mg | 4.6 mg |
| Thiamin | 0.02 mg | 0.02 mg |
| Riboflavin | 0.03 mg | 0.03 mg |
| Niacin | 0.09 mg | 0.09 mg |
| Vitamin B6 | 0.04 mg | 0.04 mg |
| Folate, total | 3 ug | 3 ug |
| Vitamin B12 | 0 ug | 0 ug |
| Potassium | 107 mg | 107 mg |
| Calcium | 6 mg | 6 mg |
| Phosphorus | 11 mg | 11 mg |
| Magnesium | 5 mg | 5 mg |
| Iron | 0.12 mg | 0.12 mg |
| Zinc | 0.04 mg | 0.04 mg |
| Selenium | 0 ug | 0 ug |
| Iodine | Unknown | Unknown |
| Copper | 0.03 mg | 0.03 mg |
Energy comes from USDA nutrient 1008. Salt is calculated as sodium × 2.5, with unit conversion to grams. It is not a separately measured salt value.
Preparation
An apple is 52 kcal per 100 g, almost all of it sugar and water, with 0.2 g of fat. Nothing you do to a raw apple changes that. Cooking it does not either, until something is added — and something usually is: a crumble topping, a spoon of sugar, or the pastry around a slice, each of which will be larger than the fruit inside it.
Logging this food
USDA's sizes matter here as much as with bananas: extra small 101 g and 53 kcal, small 149 g and 77, medium 182 g and 95, large 223 g and 116. A cup of slices is 109 g and 57. The skin is included in all of these figures and is where most of the fibre is, so peeling costs more than it saves.
Swaps and alternatives
Nothing in this family is lighter per 100 g. A banana is 89 and an avocado 160. Across the fruit pages, watermelon at 30 kcal per 100 g and strawberries at 32 are the two that undercut an apple, and both are mostly water. As a fruit to eat without thinking about it, an apple is close to the floor.