A typical serving of sourdough bread (1 slice, small (1 oz), 28 g) has about 77 calories. Per 100 g: 272 kcal, 10.8 g protein, 51.9 g carbs, 2.4 g fat. The same 100 g carries 2.2 g of fiber and 4.6 g of sugar. Most of the energy comes from carbohydrate.
| Serving | Weight | Calories |
|---|---|---|
| 1 slice, small (1 oz) | 28 g | 77 kcal |
| 1 large slice | 139 g | 378 kcal |
| 100 g | 100 g | 272 kcal |
Fermentation changes the flavor, not the calories: it tracks white bread closely. On the energy-density scale, 272 kcal per 100 g puts sourdough bread at the high end.
A typical serving (1 slice, small (1 oz), 28 g) has about 77 calories, and 100 g has 272 kcal. Calories scale with weight, so double the portion means double the number.
There are 10.8 g of protein in 100 g of sourdough bread, which works out to about 3.1 g per serving (1 slice). Treat it as an energy source rather than a protein source.
There are 51.9 g of carbohydrate per 100 g of sourdough bread, or about 15 g in 1 slice (28 g).
Every value on this page comes from USDA FoodData Central, entry 172675 (SR Legacy). Serving figures are converted from the per-100-g data, so rounding can shift a total by a calorie or two.
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Get JoulesA note on accuracy: calculators like this one provide estimates based on population-level formulas — your real needs vary with genetics, muscle mass, medical conditions, and more. Results are for information only and are not medical advice, a diagnosis, or a prescription. Talk to a doctor or registered dietitian before making significant changes to your diet or exercise, especially if you have a health condition, are pregnant, or are under 18.
Nutrition data: USDA FoodData Central, FDC ID 172675 (SR Legacy). Serving calories are computed from the per-100-g values.
