How much protein is in an apple?

An apple has 0.3 g of protein per 100 g and 0.5 g per 1 medium (3" dia) (182 g). That is 0.6 g of protein per 100 kcal — essentially not a protein source.

Where do these calorie figures come from?

USDA FoodData Central record 171688, “Apples, raw, with skin (Includes foods for USDA's Food Distribution Program)” (SR Legacy, FDC SR Legacy 2018-04 + FNDDS 2024-10-31). Energy is USDA nutrient 1008 (Energy, kcal); protein, fat and carbohydrate are read from the same record. USDA data is in the public domain, and the FDC ID above links straight to it.

All foods

Bananas, apples and avocadosUSDA SR LegacyFDC 171688

Calories in an apple

USDA FoodData Central record for “Apples, raw, with skin (Includes foods for USDA's Food Distribution Program)” — per 100 g, per every USDA serving size, and next to the other bananas, apples and avocados rows.

The short answer

An apple: 52 kcal per 100 g. 1 medium (3" dia) (182 g) is 95 kcal with 0.5 g of protein. Source: USDA FoodData Central record 171688, "Apples, raw, with skin (Includes foods for USDA's Food Distribution Program)".

Per 100 g

Nutrient	Per 100 g	Share of energy
Energy	52 kcal	100%
Protein	0.3 g	2%
Fat	0.2 g	3%
Carbohydrate	13.8 g	95%

An apple is 52 kcal per 100 g in USDA FoodData Central (SR Legacy). Of that energy, about 2% comes from protein, 3% from fat and 95% from carbohydrate. That works out to 0.6 g of protein per 100 kcal — essentially not a protein source.

Per serving

The serving sizes USDA lists for this record, priced from the per-100 g figures above. Nothing here is rounded to a “portion” — the gram weight next to each label is what the calories are computed from.

Serving	Weight	Calories	Protein	Fat	Carbs
100 g	100 g	52	0.3 g	0.2 g	13.8 g
1 cup, quartered or chopped	125 g	65	0.4 g	0.3 g	17.3 g
1 cup slices	109 g	57	0.3 g	0.2 g	15 g
1 large (3-1/4" dia)	223 g	116	0.7 g	0.4 g	30.8 g
1 medium (3" dia)	182 g	95	0.5 g	0.4 g	25.1 g
1 small (2-3/4" dia)	149 g	77	0.4 g	0.3 g	20.6 g
1 extra small (2-1/2" dia)	101 g	53	0.3 g	0.2 g	13.9 g
1 NLEA serving	242 g	126	0.7 g	0.5 g	33.4 g

Compared with other bananas, apples and avocados

Food	kcal / 100 g	Protein / 100 g	Per serving
A banana	89	1.1 g	105 kcal · 1 medium (7" to 7-7/8" long)
An apple	52	0.3 g	95 kcal · 1 medium (3" dia)
An avocado	160	2 g	240 kcal · 1 cup, cubes
A Hass avocado	167	2 g	227 kcal · 1 fruit, without skin and seed

Worth knowing

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.

Other tables in fruits and fruit juices

The same numbers for the foods this one usually shares a plate — or a shopping list — with.

Questions about an apple

How many calories are in an apple?: An apple: 52 kcal per 100 g. 1 medium (3" dia) (182 g) is 95 kcal with 0.5 g of protein. Source: USDA FoodData Central record 171688, "Apples, raw, with skin (Includes foods for USDA's Food Distribution Program)".
How much protein is in an apple?: An apple has 0.3 g of protein per 100 g and 0.5 g per 1 medium (3" dia) (182 g). That is 0.6 g of protein per 100 kcal — essentially not a protein source.
Where do these calorie figures come from?: USDA FoodData Central record 171688, “Apples, raw, with skin (Includes foods for USDA's Food Distribution Program)” (SR Legacy, FDC SR Legacy 2018-04 + FNDDS 2024-10-31). Energy is USDA nutrient 1008 (Energy, kcal); protein, fat and carbohydrate are read from the same record. USDA data is in the public domain, and the FDC ID above links straight to it.

How calorie.one logs it

Type “apple” into calorie.one and the app matches this exact record — “Apples, raw, with skin (Includes foods for USDA's Food Distribution Program)” — estimates the grams, and shows the line with its USDA label. You correct the amount; the per-100 g figure is never guessed. That split between recognition and arithmetic is the whole methodology. For the numbers in context, read How many calories are in a banana?.