Portobello Mushrooms Calories & Carbs
Keto-friendlyLast updated September 8, 2026 · Compiled by the CarbMeNot Team
Values per 1 cup sliced (86g), 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 mushrooms?
Portobello Mushrooms — 1 cup sliced (86g), 86g — has 2g net carbs: 3g total carbs minus 1g fiber, plus 1.8g protein, 0.3g 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 mushrooms 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 mushrooms 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 mushrooms keto-friendly?
Yes — portobello mushrooms is keto-friendly. 1 cup sliced (86g), 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 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 — 1 cup sliced (86g), 86g — has 19 calories, with 1.8g protein, 0.3g 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 | 2.1g |
| 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 (1 cup sliced (86g), 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 mushrooms?
- Portobello Mushrooms has 2g of net carbs per 1 cup sliced (86g), 86g — 3g total carbs minus 1g fiber.
- Is portobello mushrooms keto-friendly?
- Yes — portobello mushrooms is keto-friendly. 1 cup sliced (86g), 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 mushrooms?
- Portobello Mushrooms (1 cup sliced (86g), 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.