How much protein is in unsalted peanut butter?

Unsalted peanut butter has 22.2 g of protein per 100 g and 7.1 g per 2 tbsp (32 g). That is 3.7 g of protein per 100 kcal — a modest protein contribution.

Where do these calorie figures come from?

USDA FoodData Central record 172470, “Peanut butter, smooth style, without salt” (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

Nuts and peanut butterUSDA SR LegacyFDC 172470

Calories in unsalted peanut butter

USDA FoodData Central record for “Peanut butter, smooth style, without salt” — per 100 g, per every USDA serving size, and next to the other nuts and peanut butter rows.

The short answer

Unsalted peanut butter: 598 kcal per 100 g. 2 tbsp (32 g) is 191 kcal with 7.1 g of protein. Source: USDA FoodData Central record 172470, "Peanut butter, smooth style, without salt".

Per 100 g

Nutrient	Per 100 g	Share of energy
Energy	598 kcal	100%
Protein	22.2 g	14%
Fat	51.4 g	72%
Carbohydrate	22.3 g	14%

Unsalted peanut butter is 598 kcal per 100 g in USDA FoodData Central (SR Legacy). Of that energy, about 14% comes from protein, 72% from fat and 14% from carbohydrate. That works out to 3.7 g of protein per 100 kcal — a modest protein contribution.

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	598	22.2 g	51.4 g	22.3 g
2 tbsp	32 g	191	7.1 g	16.4 g	7.1 g
1 cup	258 g	1543	57.3 g	132.6 g	57.5 g

Compared with other nuts and peanut butter

Food	kcal / 100 g	Protein / 100 g	Per serving
Almonds	579	21.2 g	164 kcal · 1 oz (23 whole kernels)
Walnuts	654	15.2 g	186 kcal · 1 oz (14 halves)
Cashews	553	18.2 g	157 kcal · 1 oz
Pistachios	560	20.2 g	159 kcal · 1 oz (49 kernels)
Peanuts	567	25.8 g	161 kcal · 1 oz
Peanut butter	598	22.2 g	191 kcal · 2 tbsp
Unsalted peanut butter	598	22.2 g	191 kcal · 2 tbsp

Other tables in legumes and legume products

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

Calories in cooked black beans132 kcal / 100 g

Questions about unsalted peanut butter

How many calories are in unsalted peanut butter?: Unsalted peanut butter: 598 kcal per 100 g. 2 tbsp (32 g) is 191 kcal with 7.1 g of protein. Source: USDA FoodData Central record 172470, "Peanut butter, smooth style, without salt".
How much protein is in unsalted peanut butter?: Unsalted peanut butter has 22.2 g of protein per 100 g and 7.1 g per 2 tbsp (32 g). That is 3.7 g of protein per 100 kcal — a modest protein contribution.
Where do these calorie figures come from?: USDA FoodData Central record 172470, “Peanut butter, smooth style, without salt” (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 “unsalted peanut butter” into calorie.one and the app matches this exact record — “Peanut butter, smooth style, without salt” — 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 Calories in olive oil, butter and cooking fats.