Calories in Sourdough
Per 1 slice, 48 g
Sourdough has 131 calories per 1 slice, 48 g. That is about 7% of a 2,000-calorie day. The same serving provides 5.4 g of protein, 25.0 g of carbohydrate, 0.8 g of fat and 1.3 g of fibre. Per 100 g, that works out at 273 calories and 11.3 g of protein. Against the thresholds EU food labelling uses, it qualifies as a source of protein and low in fat. The long ferment can make it gentler on digestion; the calories are much the same as ordinary bread.
Calories and macros
| Per 1 slice, 48 g | Serving | Per 100 g | % of daily intake |
|---|---|---|---|
| Calories | 131 kcal | 273 kcal | 7% |
| Protein | 5.4 g | 11.3 g | 11% |
| Carbohydrate | 25.0 g | 52.1 g | 10% |
| Fat | 0.8 g | 1.7 g | 1% |
| Fibre | 1.3 g | 2.7 g | 4% |
Daily intake percentages use the EU reference intakes an average adult label is based on: 2,000 kcal, 50 g protein, 260 g carbohydrate, 70 g fat, 30 g fibre.
What this is good for
These are the nutrition claims this food would qualify for under EU labelling rules — thresholds, not opinions.
Worth knowing
Figures are for a typical example and will vary by brand, ripeness and how it was cooked. For a target of your own, run the calorie calculator or take the short quiz. To log this without doing the arithmetic, Joules is free.
Figures last reviewed 29 August 2026.
Common questions about sourdough
How many calories are in sourdough?
Sourdough has 131 calories per 1 slice, 48 g, which is about 7% of a 2,000-calorie day.
How many calories are in 100 g of sourdough?
100 g of sourdough contains 273 calories.
How much protein is in sourdough?
One serving of 1 slice, 48 g provides 5.4 g of protein — 11.3 g per 100 g, or 11% of the 50 g daily reference intake.
How many carbs are in sourdough?
One serving of 1 slice, 48 g contains 25.0 g of carbohydrate, of which 1.3 g is fibre.
What is sourdough a good source of?
Measured against EU food labelling thresholds, sourdough qualifies as a source of protein and low in fat. At least 12% of its calories come from protein. Under 3 g of fat per 100 g.