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A large mushroom with a broad, slightly domed dark-brown cap, a smooth subtly mottled surface, closely spaced deep-brown gills beneath, and a short, thick off-white stem.
●Low GI
★Natural
⚡High Potassium

Portobello mushroom Calories

Low-calorie mushroom with fiber, selenium, and B vitamins

In season: Spring · Summer · Autumn · Winter

CALORIES · 100 G

22kcal

GI

10low

POTASSIUM · 100 G

364mg

FIBER · 100 G

1.3g

Quick answer

1 piece (medium) of Portobello mushroom (84 g) has 18 calories. That works out to 22 calories per 100 g. It contains 3.3 g of carbs, 1.8 g of protein, 0.3 g of fat and 1.1 g of fiber. Its 13.4 µg of Biotin covers 45% of the Daily Value. Its glycemic index is 10 (low), so it raises blood sugar slowly.

Portobello mushroom Nutrition Facts

Selected: 1 piece (medium) · 84 g

18

KCAL / 84G

Carbs

3.3g

· 1% DV

Protein

1.8g

· 4% DV

Fat

0.3g

· 0% DV

Fiber

1.1g

· 4% DV

DV is the share of the daily value covered, on a 2,000 kcal reference diet.

Calories come from: Carbs 57% · Protein 31% · Fat 12%

Portobello mushroom nutrition facts table · 1 piece (medium) (84 g)

NutrientAmount% DV
Calories18 kcal
Total fat0.3 g0%
Saturated fat0.04 g0%
Trans fat0 g
Sodium5.04 mg0%
Total carbohydrate3.3 g1%
Fiber1.1 g4%
Protein1.8 g4%

Calories: Calories measure energy. Average daily need is 2,000 kcal. Excess calories are stored as fat, too few cause weight loss.

Carbs: Your body's primary energy source. The brain runs exclusively on carbs. Daily need: 275g.

Protein: Essential for muscle repair and cell growth. Daily need: 50g. Keeps you full and boosts metabolism.

Fat: Needed for hormone production and vitamin absorption. Daily need: 78g. Limit saturated fats, choose unsaturated.

Fiber: Critical for digestive health and satiety. Daily need: 28g. Stabilizes blood sugar, lowers cholesterol.

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How Many Calories in 1 Medium Portobello mushroom?

ServingAmountCalories
1 piece (medium)84 g18 kcal
1 piece (small)50 g11 kcal
1 cup (shredded)70 g15 kcal
1 cup (diced)86 g19 kcal
100 g100 g22 kcal
1 piece (large)120 g26 kcal
1 serving (medium)150 g33 kcal
1 piece (jumbo)160 g35 kcal
2 piece (double)168 g37 kcal
1 serving (large)250 g55 kcal

Calculated from 22 calories per 100 g.

Frequently Asked Questions About Portobello mushroom

How do you cook a Portobello mushroom?

Cook a Portobello mushroom in a skillet, oven, or on a grill until the cap is tender and heated through. Brush it lightly with oil and add salt or seasonings; its broad cap also works well for stuffing.

Should you remove the gills from a Portobello mushroom?

No, a Portobello mushroom’s dark gills are edible and do not need to be removed. Scrape them out with a spoon if you want more room for stuffing or a lighter-colored finished dish.

Can you eat the stem of a Portobello mushroom?

Yes, you can eat a Portobello mushroom stem after trimming off its dry, tough end. Chop the rest into a filling, sauté it with other vegetables, or add it to soup or sauce.

How do you clean a Portobello mushroom?

Wipe a Portobello mushroom with a damp cloth or rinse it briefly under running water, then dry it well. Avoid soaking it, because the cap can absorb water and release extra moisture while cooking.

How should you store Portobello mushrooms?

Keep Portobello mushrooms unwashed in the refrigerator, in a paper bag or a container lined with paper towel. Avoid sealing them in an airtight plastic bag, where trapped moisture can make them turn slimy sooner.

Can you eat a Portobello mushroom raw?

Yes, a fresh Portobello mushroom can be eaten raw after it has been cleaned and thinly sliced. Cooking gives it a softer texture and deeper flavor; use only mushrooms that are fresh and in good condition.

How do you grill a Portobello mushroom?

Brush a cleaned Portobello mushroom lightly with oil and place it on the grill with the gill side down first. Turn it once the cap has softened, and cook until it is heated through and tender.

Can a Portobello mushroom replace a burger patty?

Yes, a whole Portobello mushroom cap makes a convenient burger-style filling, though it is not nutritionally or texturally identical to meat. Grill or pan-cook it, then serve it in a bun with your preferred toppings.

Can you freeze Portobello mushrooms?

Yes, but Portobello mushrooms freeze better after cooking than when raw. Slice and sauté them until their released liquid evaporates, cool them, and freeze in a sealed container; use thawed mushrooms in cooked dishes.

What is the difference between a Portobello mushroom and a cremini mushroom?

A Portobello mushroom and a cremini mushroom are the same species at different stages of maturity: Portobellos are the larger, fully mature form. Creminis are smaller and younger, so they are often sold whole for everyday cooking.

Portobello mushroom Vitamins & Minerals

Vitamins

Biotin

13.44µg · 45% DV

B2

0.34mg · 26% DV

B5

1.26mg · 25% DV

B3

3.78mg · 24% DV

Minerals

Copper

0.27mg · 30% DV

Selenium

16µg · 29% DV

Phosphorus

72mg · 10% DV

Potassium ⭐

306mg · 9% DV

Sodium

5.04mg · 0% DV

Portobello mushroom Glycemic Index

GLYCEMIC INDEX

10
Low
0 Low5570100

GLYCEMIC LOAD

0.3
Low

Accounts for portion size — a more realistic measure than GI alone.

How to Burn Off Portobello mushroom

To burn the 18 calories in 1 piece (medium) (84 g):

🚶

4min

Walking (5 km/h)

🏃

2min

Running (8 km/h)

🚴

2min

Cycling

🏊

2min

Swimming

Times are calculated with the MET equation for a 70 kg adult. Actual burn varies with your weight, age and pace.

What is Portobello mushroom?

A Portobello mushroom is a large, mature cultivated mushroom, with a broad cap and a substantial, tender texture. Its flavour is mild and earthy, becoming more savoury when cooked. It is especially popular grilled or roasted, often served whole as a main or used in place of a burger patty; stuffing the cap is another common preparation. You can also slice it into pasta, salads or grain bowls.

Portobello mushrooms are low in calories and provide fibre, selenium and B vitamins; 100 g contains 22 calories. For a lighter meal, grill or roast one with a little oil and serve it with vegetables or a grain-based side.

How Nutritious Is Portobello mushroom?

Nutrient density

High

72/ 100

How many vitamins, minerals and how much fiber this food carries per calorie. A high score means a lot of nutrition for few calories.

Satiety score

Medium

47/ 100

An EatBetter score computed from fiber, protein and calorie density. A high score means staying full longer on the same calories.

Both scores are calculated per 100 g and do not change with the selected portion. The satiety score is EatBetter's own calculation, not a clinical measure.

Is Portobello mushroom Processed?

NOVA 1

Unprocessed

1. Unprocessed

2. Minimally Processed

3. Processed

4. Ultra-Processed

NOVA classifies foods into 4 groups by industrial processing. NOVA 1 (unprocessed) is the healthiest.

Does Portobello mushroom Contain Allergens?

No known major allergens

Gluten free
Dairy free
Eggs free
Peanuts free
Tree nuts free
Fish free
Soy free
Sesame free

Which Diets Is Portobello mushroom Good For?

Vegan

✓ Suitable

Vegetarian

✓ Suitable

Gluten-Free

✓ Suitable

Dairy-Free

— Not suitable

Mediterranean

✓ Suitable

Paleo

✓ Suitable

Whole30

— Not suitable

DASH

— Not suitable

Keto

✓ Suitable

Low FODMAP

— Not suitable

Portobello mushroom Fat Profile

SATURATED

0.04g

MONOUNSATURATED

0.01g

POLYUNSATURATED

0.14g

⚖️

Omega 6:3 ratio 13:1

Above the ideal 4:1 (13:1).

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Nutrition data compiled from USDA FoodData Central and scientific sources.