QUICK ANSWER
How many calories are in white mushrooms?
Raw white mushrooms provide 22 kcal per 100 g. Scale from the edible portion and keep other states separate.
22 kcal / 100 gNutrition values describe a reference food state, not every individual item. Variety, water content, preparation and portion weight can change the estimate.
THE NUMBERS
White mushrooms nutrition facts per 100 g
The values below use the reference state shown at the top of this page. Keeping one gram basis makes it easier to compare foods before translating the values to the portion you actually ate.
- Calories
- 22 kcal
- Protein
- 3.09 g
- Carbohydrate
- 3.26 g
- Fat
- 0.34 g
- Fibre
- 1 g
- Potassium
- 318 mg
- Niacin
- 3.61 mg
- Selenium
- 9.3 µg
Source: USDA FoodData Central SR Legacy record 169251. Values may be rounded for readability.
SERVING SIZE
Calories by portion and serving weight
Words such as “small,” “medium,” “half” and “one piece” are convenient but imprecise. Grams make the estimate reproducible, particularly when natural foods vary in size.
MACROS
Carbohydrate, protein and fat explained
Protein
3.09 g per 100 g. From Mushrooms, white, raw.
Carbohydrate
3.26 g per 100 g. From Mushrooms, white, raw.
Fat
0.34 g per 100 g. From Mushrooms, white, raw.
MORE THAN CALORIES
Fibre, vitamins and minerals
One food does not need to provide every nutrient. These are the characteristics most useful for understanding where white mushrooms fits in a varied eating pattern.
Potassium
318 mg per 100 g in the selected USDA record.
Niacin
3.61 mg per 100 g in the selected USDA record.
Selenium
9.3 µg per 100 g in the selected USDA record.
Riboflavin
0.402 mg per 100 g in the selected USDA record.
FOOD STATE MATTERS
How preparation changes the nutrition estimate
A reliable calorie entry should describe the food you actually ate—not merely a food with a similar name.
White, raw
Selected generic reference.
White, cooked
Use boiled, microwaved or stir-fried record as appropriate.
Portabella, shiitake or other species
Choose the species-specific mapped record.
Canned
Use the canned drained-solids record.
PRACTICAL CONTEXT
How white mushrooms can fit different goals
There is no universal “good” or “bad” food. Portion, frequency, the rest of the meal, preferences and individual health needs all matter.
Portion math
At 22 kcal per 100 g, the 10 g example is 2.2 kcal.
Fibre check
The selected record lists 1 g fibre per 100 g.
Protein check
The selected record lists 3.09 g protein per 100 g.
Best logging move
Choose the mushroom species and cooked state before adding oil, butter or sauce.
QUALITY & SAFETY
How to choose, store and prepare it
Store
Keep cultivated mushrooms chilled and reasonably dry.
After opening or cutting
Store cut mushrooms covered in a clean container.
Prepare
Clean according to package directions and use clean utensils.
Safety boundary
This page cannot identify wild mushrooms; never use a nutrition page to determine whether a foraged mushroom is safe.
PHOTO LOGGING
How to log white mushrooms more accurately
A food photo can suggest the ingredient, but it cannot always reveal exact weight, hidden oil or preparation details. These checks turn an image guess into a better estimate.
- 01
Match the exact reference state: Mushrooms, white, raw.
- 02
Use edible grams. Calories are scaled from the selected per-100-g record; named portion weights come from the same local USDA record.
- 03
Log oil, sauce, sweetener, salt and recipe ingredients separately.
- 04
Use a separate record when preparation changes the food state.
COMMON QUESTIONS
White mushrooms calorie and nutrition questions
How many calories are in 100 g of mushrooms?
22 kcal in the selected Mushrooms, white, raw record.
How much fibre is in mushrooms?
1 g per 100 g in the selected record.
Which mushrooms state does this page use?
Mushrooms, white, raw. Preparation and edible state are part of the answer.
Does this generic page use morel mushrooms?
No. The production reference is cultivated raw white mushrooms; morels remain species-specific.
How are the portion calories calculated?
Each portion is scaled from 22 kcal per 100 g. Named portion weights come from the selected source record.
KEEP EXPLORING
Related food guides
SOURCES & METHOD
Where these numbers come from
Mushrooms, white, raw, per 100 g edible portion. Numeric nutrition and named-portion claims use the nutrition-reviewed local USDA record. Preparation notes cover the common USDA forms of this food. The nutrient record does not establish storage duration, clinical advice or food-safety limits; use package directions and current authoritative guidance where relevant.
Open USDA FoodData Central SR Legacy record 169251 ↗Page reviewed 26 August 2026. We show the food state, gram basis and source record so readers can check the estimate instead of treating one number as universally exact.