How much protein is in raw white mushrooms?

Raw white mushrooms has 3.1 g of protein per 100 g and 2.2 g per 1 cup, pieces or slices (70 g). That is 14.1 g of protein per 100 kcal — a solid protein-per-calorie ratio for a whole food.

Where do these calorie figures come from?

USDA FoodData Central record 169251, “Mushrooms, white, raw” (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

Everyday vegetablesUSDA SR LegacyFDC 169251

Calories in raw white mushrooms

USDA FoodData Central record for “Mushrooms, white, raw” — per 100 g, per every USDA serving size, and next to the other everyday vegetables rows.

The short answer

Raw white mushrooms: 22 kcal per 100 g. 1 cup, pieces or slices (70 g) is 15 kcal with 2.2 g of protein. Source: USDA FoodData Central record 169251, "Mushrooms, white, raw".

Per 100 g

Nutrient	Per 100 g	Share of energy
Energy	22 kcal	100%
Protein	3.1 g	44%
Fat	0.3 g	10%
Carbohydrate	3.3 g	47%

Raw white mushrooms is 22 kcal per 100 g in USDA FoodData Central (SR Legacy). Of that energy, about 44% comes from protein, 10% from fat and 47% from carbohydrate. That works out to 14.1 g of protein per 100 kcal — a solid protein-per-calorie ratio for a whole food.

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	22	3.1 g	0.3 g	3.3 g
1 cup, pieces or slices	70 g	15	2.2 g	0.2 g	2.3 g
1 cup, whole	96 g	21	3 g	0.3 g	3.2 g
1 large	23 g	5	0.7 g	0.1 g	0.8 g
1 medium	18 g	4	0.6 g	0.1 g	0.6 g
1 slice	6 g	1	0.2 g	0 g	0.2 g
1 small	10 g	2	0.3 g	0 g	0.3 g
0.5 cup pieces	35 g	8	1.1 g	0.1 g	1.2 g

Compared with other everyday vegetables

Food	kcal / 100 g	Protein / 100 g	Per serving
Raw carrots	41	0.9 g	52 kcal · 1 cup chopped
Raw tomatoes	18	0.9 g	32 kcal · 1 cup, chopped or sliced
Raw cucumber	15	0.7 g	45 kcal · 1 cucumber (8-1/4")
Raw onions	40	1.1 g	64 kcal · 1 cup, chopped
Raw red bell pepper	26	1 g	39 kcal · 1 cup, chopped
Raw white mushrooms	22	3.1 g	15 kcal · 1 cup, pieces or slices
Sweet corn	86	3.3 g	123 kcal · 1 ear, large (7-3/4" to 9" long) yields
Green peas	81	5.4 g	117 kcal · 1 cup

Other tables in vegetables and vegetable products

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

Questions about raw white mushrooms

How many calories are in raw white mushrooms?: Raw white mushrooms: 22 kcal per 100 g. 1 cup, pieces or slices (70 g) is 15 kcal with 2.2 g of protein. Source: USDA FoodData Central record 169251, "Mushrooms, white, raw".
How much protein is in raw white mushrooms?: Raw white mushrooms has 3.1 g of protein per 100 g and 2.2 g per 1 cup, pieces or slices (70 g). That is 14.1 g of protein per 100 kcal — a solid protein-per-calorie ratio for a whole food.
Where do these calorie figures come from?: USDA FoodData Central record 169251, “Mushrooms, white, raw” (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 “raw white mushrooms” into calorie.one and the app matches this exact record — “Mushrooms, white, raw” — 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 to track mixed meals accurately with AI.