Carbs in Guinness
Keto-friendlyHow many carbs are in guinness?
Guinness has 3.9g net carbs per 100g — 3.9g total carbs minus 0g fiber — plus 0.2g protein, 0g fat, and 16 calories. 1 can (12 fl oz) works out to about 13.8g net carbs and 57 calories. That makes guinness relatively low in net carbs and lower than the typical drink, which averages about 21.1g net carbs per 100g. With this carb count, guinness 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 Open Food Facts; 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 guinness keto-friendly?
Yes, guinness can fit a keto diet in moderate portions. It has 3.9g net carbs per 100g (3.9g total carbs − 0g fiber). A typical serving — 1 can (12 fl oz) — is about 13.8g net carbs. On a standard keto diet (20–50g net carbs per day), that leaves plenty of room for other drinks and meals.
Carbs by serving size
| Serving | Net carbs | Total carbs | Protein | Calories |
|---|---|---|---|---|
| 1 can (12 fl oz) | 13.8g | 13.8g | 0.7g | 57 |
| 100 g (3.5 oz) | 3.9g | 3.9g | 0.2g | 16 |
| 1 oz (28 g) | 1.1g | 1.1g | 0.1g | 4 |
How many calories are in guinness?
Guinness has 16 calories per 100g. 1 can (12 fl oz) has about 57 calories. That's alongside 0.2g protein, 0g fat, and 3.9g net carbs per 100g.
Nutrition facts
| Nutrient | Amount (per 100 g) |
|---|---|
| Calories | 16 |
| Total carbs | 3.9g |
| Net carbs | 3.9g |
| Fiber | 0g |
| Sugar | 0.7g |
| Sugar alcohols | 0g |
| Protein | 0.2g |
| Fat | 0g |
| Sodium | 5mg |
| Potassium | 0mg |
Source: Open Food Facts (Guinness). Net carbs = total carbs − fiber − sugar alcohols, computed by CarbMeNot.
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Frequently asked questions
- How many carbs are in guinness?
- Guinness has 3.9g of total carbs and 3.9g of net carbs per 100 grams.
- How many net carbs are in guinness?
- Guinness has 3.9g of net carbs per 100 grams (total carbs 3.9g minus 0g fiber).
- Is guinness keto-friendly?
- Yes, guinness can fit a keto diet in moderate portions. It has 3.9g net carbs per 100g (3.9g total carbs − 0g fiber). A typical serving — 1 can (12 fl oz) — is about 13.8g net carbs. On a standard keto diet (20–50g net carbs per day), that leaves plenty of room for other drinks and meals.
- How many calories are in guinness?
- Guinness has 16 calories per 100 grams.
- How many carbs are in 1 can (12 fl oz) of guinness?
- 1 can (12 fl oz) of guinness (355g) has about 13.8g net carbs, 13.8g total carbs, and 57 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.