Carbs in Portobello Mushrooms
Keto-friendlyHow many carbs are in portobello mushrooms?
Portobello Mushrooms has 2.3g net carbs per 100g — 3.5g total carbs minus 1.2g fiber — plus 2.1g protein, 0.3g fat, and 22 calories. 1 cup sliced (86g) works out to about 2g net carbs and 19 calories. That makes portobello mushrooms very low in net carbs and lower than the typical vegetable, which averages about 17.8g net carbs per 100g. With this carb count, portobello mushrooms fits a keto or low-carb diet (usually 20–50g net carbs per day) in normal portions. Values are per per 100 g, sourced from Manufacturer-reported values; net carbs are computed by CarbMeNot.
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Last updated June 10, 2026 · Reviewed by Jordan Lee, Nutrition Editor
Values per 100 g.
Is portobello mushrooms keto-friendly?
Yes — portobello mushrooms is keto-friendly. It has 2.3g net carbs per 100g (3.5g total carbs − 1.2g fiber). A typical serving — 1 cup sliced (86g) — is about 2g net carbs. On a standard keto diet (20–50g net carbs per day), that leaves plenty of room for other vegetables and meals.
Carbs by serving size
| Serving | Net carbs | Total carbs | Protein | Calories |
|---|---|---|---|---|
| 1 cup sliced (86g) | 2g | 3g | 1.8g | 19 |
| 100 g (3.5 oz) | 2.3g | 3.5g | 2.1g | 22 |
| 1 oz (28 g) | 0.6g | 1g | 0.6g | 6 |
How many calories are in portobello mushrooms?
Portobello Mushrooms has 22 calories per 100g. 1 cup sliced (86g) has about 19 calories. That's alongside 2.1g protein, 0.3g fat, and 2.3g net carbs per 100g.
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 | 2.1g |
| Fat | 0.3g |
| Sodium | 10mg |
| Potassium | 414mg |
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 mushrooms?
- Portobello Mushrooms has 3.5g of total carbs and 2.3g of net carbs per 100 grams.
- How many net carbs are in portobello mushrooms?
- Portobello Mushrooms has 2.3g of net carbs per 100 grams (total carbs 3.5g minus 1.2g fiber).
- Is portobello mushrooms keto-friendly?
- Yes — portobello mushrooms is keto-friendly. It has 2.3g net carbs per 100g (3.5g total carbs − 1.2g fiber). A typical serving — 1 cup sliced (86g) — is about 2g 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 mushrooms?
- Portobello Mushrooms has 22 calories per 100 grams.
- How many carbs are in 1 cup sliced (86g) of portobello mushrooms?
- 1 cup sliced (86g) of portobello mushrooms (86g) has about 2g net carbs, 3g total carbs, and 19 calories.
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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.