Published by Saura ·
Button mushrooms nutrition: calories, protein and portion sizes
In this Fineli Release 20.0 reference, 100 g provides about 15 kcal and 2.1 g protein. Reference food and preparation: fresh button mushrooms or champignons. Match the edible weight and preparation below, or use the current label for your own product.
Quick answer
An example 100 g edible portion of button mushrooms (fresh button mushrooms or champignons) supplies about 15 kcal, 2.1 g protein and 1.5 g fiber. This is a scaled food-composition estimate, not a recommended serving size.
Button mushrooms: nutrition per 100 g and example portion
Reference preparation: fresh button mushrooms or champignons. The exact source name is “Champignon, fresh” (Fineli food 345). Available carbohydrate excludes fiber and is not the same measure as US Total Carbohydrate.
Values are rounded after scaling. A small reported amount may round below 0.1 g; a missing value is marked Not available rather than treated as zero. This selected extract does not include sugar, sodium or micronutrient amounts; the full Fineli database contains information beyond these tables.
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| Nutrient | Per 100 g | Per 100 g example |
|---|---|---|
| Energy | 15 kcal | 15 kcal |
| Protein | 2.1 g | 2.1 g |
| Available carbohydrate (excludes fiber) | 0.3 g | 0.3 g |
| Fat | 0.2 g | 0.2 g |
| Saturated fat | <0.1 g | <0.1 g |
| Fiber | 1.5 g | 1.5 g |
How to weigh button mushrooms
Use the cleaned fresh mushroom weight for this table. Mushrooms shrink during frying, so 100 g cooked mushrooms can represent more than 100 g raw. Dried mushrooms are especially concentrated and need their own entry.
Calculate your own button mushrooms portion
For the 100 g example, multiply the source amounts by 100 ÷ 100 = 1. The unrounded energy calculation is 15 × 1 = 15 kcal, displayed as approximately 15 kcal. Use the same factor for protein, available carbohydrate, fat and fiber.
For another amount, replace 100 with your own edible weight. Keep the preparation as fresh button mushrooms or champignons; if your food is prepared differently, choose a matching reference or calculate its recipe instead.
How preparation changes the estimate
Mushrooms absorb cooking fat and are often served with cream or butter. Record the amount used in the recipe rather than assuming the cooked mushrooms retain plain raw values. Their savory flavor does not make a small portion equivalent to a serving of meat or beans.
Meal ideas using button mushrooms
Use these combinations as menu ideas and adjust the amounts to your appetite and preferences. Each added ingredient belongs in the complete meal estimate.
- Add mushrooms to a white-bean and barley bowl.
- Cook mushrooms into a tomato pasta sauce and include the pan oil.
Compare other vegetables
The following are separate reference foods, shown per 100 g for orientation. Check the preparation column: dry, raw and cooked values are not interchangeable, and equal gram weights are not necessarily equivalent portions.
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| Food | Reference preparation | Energy / 100 g | Protein / 100 g | Fiber / 100 g |
|---|---|---|---|---|
| White cabbage | raw white cabbage | 31 kcal | 1.2 g | 2.5 g |
| Broccoli | plain broccoli, uncooked reference | 35 kcal | 3.9 g | 3.5 g |
| Red bell pepper | raw red sweet pepper | 28 kcal | 0.9 g | 1.9 g |
Nutrition values and photo results are estimates. Check ingredients and portions before saving a meal.
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- White cabbage nutrition: calories, protein and portion sizesWhite cabbage (raw): about 31 kcal and 1.2 g protein per 100 g. See portion calculations, preparation notes and the exact Fineli source.
- Broccoli nutrition: calories, protein and portion sizesBroccoli (raw): about 35 kcal and 3.9 g protein per 100 g. See portion calculations, preparation notes and the exact Fineli source.
- Red bell pepper nutrition: calories, protein and portion sizesRed bell pepper (raw): about 28 kcal and 0.9 g protein per 100 g. See portion calculations, preparation notes and the exact Fineli source.
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Frequently asked questions
How many calories are in 100 g of button mushrooms?
This fresh button mushrooms or champignons reference supplies about 15 kcal per 100 g edible portion. Match the preparation state and check a package label when available.
Does the preparation of button mushrooms matter?
Mushrooms absorb cooking fat and are often served with cream or butter. Record the amount used in the recipe rather than assuming the cooked mushrooms retain plain raw values. Their savory flavor does not make a small portion equivalent to a serving of meat or beans.
How do I calculate a different portion?
Multiply each per-100 g nutrient amount by your edible serving weight divided by 100. Match raw, dry, cooked or drained weight to the reference and include sauces or cooking additions separately.
Sources and method
- Fineli food 345: Champignon, fresh
Exact source record (Finnish interface). Values use the committed Release 20.0 extract, not a live query; a current record or a product label may differ.
- Fineli — National Food Composition Database in Finland (THL)
Release 20.0, accessed May 9, 2026. CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Selected records are scaled to example portions and rounded; available carbohydrate excludes fiber. Source values describe representative foods, not a laboratory measurement of your meal.
- Fineli food 320: White cabbage
Exact record used in the comparison table; match the preparation shown in that row.
- Fineli food 324: Broccoli
Exact record used in the comparison table; match the preparation shown in that row.
- Fineli food 386: Sweet pepper, red
Exact record used in the comparison table; match the preparation shown in that row.
- Creative Commons Attribution 4.0 International
Fineli data license. THL source values have been selected, scaled to example portions and rounded for this page. Editorial meal ideas and preparation explanations are Saura additions.