Food
Sourdough bread nutrition facts
A typical portion of sourdough bread (1 large or thick slice; 43 g, sour dough) has 120 calories and 5g of protein (USDA FoodData Central). USDA lists 2 descriptions of it: per 100 g they range from 272 calories (sour dough) to 299 (sour dough, toasted).
Nutrition Facts
* The % Daily Value (DV) tells you how much a nutrient in a serving of food contributes to a daily diet. 2,000 calories a day is used for general nutrition advice. Protein % DV here is not corrected for protein quality.
USDA values per 100 g for Bread, sour dough, scaled to the portion. Check the USDA record.
- Protein per 100 g
- 10.8g
- more than 55% of 8,218 USDA reference foods
- Calories per 100 g
- 272
- more than 68% of reference foods
- Sodium per 100 g
- 602mg
- more than 87% of reference foods
1 large or thick slice weighs 43 g in USDA's record for Bread, sour dough (FDC 2707646); across 2 records of sourdough bread USDA weighs it at 39 to 43 g, so a linked record can show a different gram weight for the same measure.
Where the calories come from: 76% carbohydrate, 8% fat and 16% protein (4 calories a gram of protein or carbohydrate, 9 of fat).
Also rich in
- Thiamin0.3 mg in 1 large or thick slice (43 g), 25% of the Daily Value
- Selenium12 µg in 1 large or thick slice (43 g), 22% of the Daily Value
- Folate81 µg DFE in 1 large or thick slice (43 g), 20% of the Daily Value
- Riboflavin0.2 mg in 1 large or thick slice (43 g), 14% of the Daily Value
- Niacin2.1 mg in 1 large or thick slice (43 g), 13% of the Daily Value
Source: USDA FoodData Central (FDC 2707646), every nutrient the record reports; FDA Daily Values, 21 CFR 101.9.
Every form of sourdough bread USDA describes
Sour dough, toasted has the most calories per 100 g (299); the fewest: Sour dough (272)
| USDA description | Calories | Protein | Fat | Sodium |
|---|---|---|---|---|
| Bread, sour dough | 272 | 10.8 g | 2.4 g | 602 mg |
| Bread, sour dough, toasted | 299 | 11.8 g | 2.7 g | 662 mg |
Every nutrient in this record (65)
The portion is 1 large or thick slice (43 g); % DV is for that portion.
Energy, macronutrients and sugars (12)
| Nutrient | Per portion | Per 100 g | % DV |
|---|---|---|---|
| Protein | 4.62 g | 10.8 g | 9% |
| Total lipid (fat) | 1.04 g | 2.42 g | 1% |
| Carbohydrate, by difference | 22.3 g | 51.9 g | 8% |
| Energy | 117 kcal | 272 kcal | |
| Alcohol, ethyl | 0 g | 0 g | |
| Water | 14.2 g | 33.0 g | |
| Total Sugars | 1.99 g | 4.62 g | |
| Fiber, total dietary | 0.95 g | 2.20 g | 3% |
| Cholesterol | 0 mg | 0 mg | 0% |
| Fatty acids, total saturated | 0.23 g | 0.53 g | 1% |
| Fatty acids, total monounsaturated | 0.16 g | 0.36 g | |
| Fatty acids, total polyunsaturated | 0.37 g | 0.85 g |
Minerals (9)
| Nutrient | Per portion | Per 100 g | % DV |
|---|---|---|---|
| Calcium, Ca | 22.4 mg | 52.0 mg | 2% |
| Iron, Fe | 1.68 mg | 3.91 mg | 9% |
| Magnesium, Mg | 13.8 mg | 32.0 mg | 3% |
| Phosphorus, P | 45.1 mg | 105 mg | 4% |
| Potassium, K | 50.3 mg | 117 mg | 1% |
| Sodium, Na | 259 mg | 602 mg | 11% |
| Zinc, Zn | 0.45 mg | 1.04 mg | 4% |
| Copper, Cu | 0.065 mg | 0.15 mg | 7% |
| Selenium, Se | 12.3 µg | 28.6 µg | 22% |
Vitamins (23)
| Nutrient | Per portion | Per 100 g | % DV |
|---|---|---|---|
| Retinol | 0 µg | 0 µg | |
| Vitamin A, RAE | 0 µg | 0 µg | 0% |
| Carotene, beta | 0 µg | 0 µg | |
| Carotene, alpha | 0 µg | 0 µg | |
| Vitamin E (alpha-tocopherol) | 0.090 mg | 0.21 mg | 1% |
| Vitamin D (D2 + D3) | 0 µg | 0 µg | 0% |
| Cryptoxanthin, beta | 0 µg | 0 µg | |
| Lycopene | 0 µg | 0 µg | |
| Lutein + zeaxanthin | 19.4 µg | 45.0 µg | |
| Vitamin C, total ascorbic acid | 0 mg | 0 mg | 0% |
| Thiamin | 0.31 mg | 0.71 mg | 25% |
| Riboflavin | 0.18 mg | 0.43 mg | 14% |
| Niacin | 2.07 mg | 4.82 mg | 13% |
| Vitamin B-6 | 0.046 mg | 0.11 mg | 3% |
| Folate, total | 52.9 µg | 123 µg | |
| Vitamin B-12 | 0 µg | 0 µg | 0% |
| Choline, total | 3.44 mg | 8.00 mg | 1% |
| Vitamin K (phylloquinone) | 0.30 µg | 0.70 µg | 0% |
| Folic acid | 40.9 µg | 95.0 µg | |
| Folate, food | 12.0 µg | 28.0 µg | |
| Folate, DFE | 81.3 µg | 189 µg | 20% |
| Vitamin E, added | 0 mg | 0 mg | |
| Vitamin B-12, added | 0 µg | 0 µg |
Fatty acids (19)
| Nutrient | Per portion | Per 100 g | % DV |
|---|---|---|---|
| SFA 4:0 | 0 g | 0 g | |
| SFA 6:0 | 0 g | 0 g | |
| SFA 8:0 | 0.00043 g | 0.0010 g | |
| SFA 10:0 | 0.00086 g | 0.0020 g | |
| SFA 12:0 | 0.00086 g | 0.0020 g | |
| SFA 14:0 | 0.0026 g | 0.0060 g | |
| SFA 16:0 | 0.16 g | 0.36 g | |
| SFA 18:0 | 0.059 g | 0.14 g | |
| MUFA 18:1 | 0.15 g | 0.34 g | |
| PUFA 18:2 | 0.34 g | 0.79 g | |
| PUFA 18:3 | 0.028 g | 0.064 g | |
| PUFA 20:4 | 0 g | 0 g | |
| PUFA 22:6 n-3 (DHA) | 0 g | 0 g | |
| MUFA 16:1 | 0.0047 g | 0.011 g | |
| PUFA 18:4 | 0 g | 0 g | |
| MUFA 20:1 | 0.0026 g | 0.0060 g | |
| PUFA 20:5 n-3 (EPA) | 0 g | 0 g | |
| MUFA 22:1 | 0 g | 0 g | |
| PUFA 22:5 n-3 (DPA) | 0 g | 0 g |
Source: USDA FoodData Central, FDC 2707646: every value the record reports, per 100 g as USDA gives it and scaled to the portion; Daily Values: 21 CFR 101.9.
Source: USDA FoodData Central (SR Legacy, Foundation Foods and Survey foods), April 30, 2026 release.
Questions
How many calories are in sourdough bread?
120 in 1 large or thick slice (43 g) of sour dough; 272 to 299 per 100 g across USDA's descriptions.
How much protein is in sourdough bread?
5g in 1 large or thick slice; 10.8 g per 100 g.
How much sodium is in sourdough bread?
260mg in 1 large or thick slice; 602 mg per 100 g. Salt added in cooking changes it: USDA lists salted and unsalted forms separately where it measured both.
Sources for this page
- USDA FoodData Central
- the food and product records, April 30, 2026 release. fdc.nal.usda.gov
- FoodData Central documentation
- what each data type is and how branded records are submitted. fdc.nal.usda.gov
- USDA Food and Nutrient Database for Dietary Studies
- the survey foods and their portions. ars.usda.gov
- 21 CFR 101.9, Nutrition labeling of food
- the label format, rounding and Daily Values. ecfr.gov
- FDA, How to Understand and Use the Nutrition Facts Label
- the 5% and 20% Daily Value rule. fda.gov