Portobello Mushroom Calories & Carbs
Keto-friendlyLast updated September 8, 2026 · Compiled by the CarbMeNot Team
Values per 1 cup diced, raw (86g); per 100 g: 2.3g net carbs, 22 cal. Net carbs = total carbs − fiber − sugar alcohols — do the math for any label with the free net carbs calculator.
How many carbs are in portobello mushroom?
Portobello Mushroom — 1 cup diced, raw (86g) — has 2g net carbs: 3g total carbs minus 1g fiber, plus 2g protein, 0g fat, and 19 calories. Per 100g that is 2.3g net carbs (3.5g total carbs, 1.2g fiber) and 22 calories. That makes portobello mushroom very low in net carbs and lower than the typical vegetable, which averages about 17.9g net carbs per 100g. With this carb count, portobello mushroom fits a keto or low-carb diet (usually 20–50g net carbs per day) in normal portions. Values are per 100 g, sourced from Manufacturer-reported values; net carbs are computed by CarbMeNot.
Is portobello mushroom keto-friendly?
Yes — portobello mushroom is keto-friendly. 1 cup diced, raw (86g) is 2g net carbs (3g total carbs − 1g fiber); per 100g that is 2.3g net carbs. On a standard keto diet (20–50g net carbs per day), that leaves plenty of room for other vegetables and meals.
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Carbs by serving size
| Serving | Net carbs | Total carbs | Protein | Calories |
|---|---|---|---|---|
| 1 cup diced, raw | 2g | 3g | 2g | 19 |
| 100 g (3.5 oz) | 2.3g | 3.5g | 2.3g | 22 |
| 1 oz (28 g) | 0.6g | 1g | 0.6g | 6 |
How many calories are in portobello mushroom?
Portobello Mushroom — 1 cup diced, raw (86g) — has 19 calories, with 2g protein, 0g fat, and 2g net carbs. Per 100g: 22 calories and 2.3g net carbs.
Nutrition facts
| Nutrient | Amount (per 100 g) |
|---|---|
| Calories | 22 |
| Total carbs | 3.5g |
| Net carbs | 2.3g |
| Fiber | 1.2g |
| Sugar | 2.3g |
| Sugar alcohols | 0g |
| Protein | 2.3g |
| Fat | 0g |
| Sodium | 9mg |
| Potassium | 364mg |
Source: Manufacturer-reported values (vegetables). Net carbs = total carbs − fiber − sugar alcohols, computed by CarbMeNot.
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Frequently asked questions
- How many carbs are in portobello mushroom?
- Portobello Mushroom (1 cup diced, raw, 86g) has 3g of total carbs and 2g of net carbs. Per 100 grams: 3.5g total, 2.3g net.
- How many net carbs are in portobello mushroom?
- Portobello Mushroom has 2g of net carbs per 1 cup diced, raw (86g) — 3g total carbs minus 1g fiber.
- Is portobello mushroom keto-friendly?
- Yes — portobello mushroom is keto-friendly. 1 cup diced, raw (86g) is 2g net carbs (3g total carbs − 1g fiber); per 100g that is 2.3g net carbs. On a standard keto diet (20–50g net carbs per day), that leaves plenty of room for other vegetables and meals.
- How many calories are in portobello mushroom?
- Portobello Mushroom (1 cup diced, raw, 86g) has 19 calories; that is 22 calories per 100 grams.
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CarbMeNot provides general nutrition information, not medical advice. Values are estimates — verify before relying on them for any health decision. See our Medical Disclaimer.