Sourdough Bread Calories & Carbs
Last updated September 8, 2026 · Compiled by the CarbMeNot Team
Values per 1 slice (48g); per 100 g: 42.3g net carbs, 212 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 sourdough bread?
Sourdough Bread — 1 slice (48g) — has 20.3g net carbs: 21.2g total carbs minus 0.9g fiber, plus 3.4g protein, 0g fat, and 102 calories. Per 100g that is 42.3g net carbs (44.1g total carbs, 1.8g fiber) and 212 calories. That makes sourdough bread high in net carbs and about average for the typical breads and grain, which averages about 44.7g net carbs per 100g. At this carb count, sourdough bread is best limited to small portions on keto (usually 20–50g net carbs per day). Values are per 100 g, sourced from Open Food Facts; net carbs are computed by CarbMeNot.
Is sourdough bread keto-friendly?
Sourdough Bread is generally not keto-friendly. 1 slice (48g) is 20.3g net carbs (21.2g total carbs − 0.9g fiber); per 100g that is 42.3g net carbs. On a standard keto diet (20–50g net carbs per day), even one serving uses a large share of your daily carbs, so keep portions small or save it for a higher-carb day.
Keeping an eye on carbs in sourdough bread?
Sourdough Bread runs higher in carbs, so portions matter. CarbMeNot tracks every gram from a photo, so you stay under your daily limit without the math.
Carbs by serving size
| Serving | Net carbs | Total carbs | Protein | Calories |
|---|---|---|---|---|
| 1 slice | 20.3g | 21.2g | 3.4g | 102 |
| 100 g (3.5 oz) | 42.3g | 44.1g | 7g | 212 |
| 1 oz (28 g) | 11.8g | 12.3g | 2g | 59 |
How many calories are in sourdough bread?
Sourdough Bread — 1 slice (48g) — has 102 calories, with 3.4g protein, 0g fat, and 20.3g net carbs. Per 100g: 212 calories and 42.3g net carbs.
Nutrition facts
| Nutrient | Amount (per 100 g) |
|---|---|
| Calories | 212 |
| Total carbs | 44.1g |
| Net carbs | 42.3g |
| Fiber | 1.8g |
| Sugar | 0g |
| Sugar alcohols | 0g |
| Protein | 7g |
| Fat | 0g |
| Sodium | 23mg |
| Potassium | 0mg |
Source: Open Food Facts (Izzio). Net carbs = total carbs − fiber − sugar alcohols, computed by CarbMeNot.
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Frequently asked questions
- How many carbs are in sourdough bread?
- Sourdough Bread (1 slice, 48g) has 21.2g of total carbs and 20.3g of net carbs. Per 100 grams: 44.1g total, 42.3g net.
- How many net carbs are in sourdough bread?
- Sourdough Bread has 20.3g of net carbs per 1 slice (48g) — 21.2g total carbs minus 0.9g fiber.
- Is sourdough bread keto-friendly?
- Sourdough Bread is generally not keto-friendly. 1 slice (48g) is 20.3g net carbs (21.2g total carbs − 0.9g fiber); per 100g that is 42.3g net carbs. On a standard keto diet (20–50g net carbs per day), even one serving uses a large share of your daily carbs, so keep portions small or save it for a higher-carb day.
- How many calories are in sourdough bread?
- Sourdough Bread (1 slice, 48g) has 102 calories; that is 212 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.