Is Sourdough Bread Keto?

Bread & Baked
Sourdough Bread sticker illustration
KETO VERDICTAVOID

Sourdough is still a carbohydrate-dense bread, with 49.7g net carbs per 100 g in this reference. A weighed 20 g piece contributes about 9.9g to a 20–25 g daily budget, which makes a small open sandwich easier to account for than an assumed full slice. Fermentation is not a deduction in this page’s net-carb calculation.

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YOUR PORTION

How much are you having?

Per 100 g (as listed by source). USDA FoodData Central.

Scales this reference to your portion, with no extra deductions. Calculation and units.

49.7gnet carbs in your portion

Total carbs
51.9g
Fiber
2.2g
Protein
10.8g
Fat
2.4g
Calories
272
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  • Net carbs (100 g)49.7g
  • Protein (100 g)10.8g
  • Fat (100 g)2.4g
  • Keto verdictAvoid on keto

NUTRITION FACTS

Per 100 g (as listed by source)

Net Carbs
49.7g
Total Carbs
51.9g
Fiber
2.2g
Protein
10.8g
Fat
2.4g
Calories
272

Source: USDA FoodData Central reference record

Source fit: generic reference; variety, brand, or preparation may differ

Net-carb calculation: total carbohydrate - fiber

This USDA record is used as a generic nutrition reference; variety, brand, or preparation may differ.

Nutrition record reviewed 2026-07-09. Maintained by KetoLens Team.

WHY IT'S NOT KETO-FRIENDLY

  • Cut and weigh the bread before adding toppings. A thick bakery slice, a thin supermarket slice and an end piece can have very different weights even when each is called one slice.
  • Toasting changes the texture and water content of a sourdough piece. Keep its original portion in your meal record instead of assuming a lighter toasted slice has lost carbohydrate.
  • For an open sandwich, track the bread separately from cheese, meat and spreads. Toppings change the meal, but they do not cancel the bread’s contribution.

PREPARATION SUGGESTIONS

CHANGE THE SANDWICH FORMAT

Place the intended filling in lettuce leaves, or serve it alongside measured crackers. If retaining some sourdough, cut the portion first rather than trimming an already assembled sandwich by eye.

Better keto swaps

  • Romaine Lettuce — 1.2g net carbs per 100 g (reference). Use whole leaves to hold sandwich fillings when a soft, crisp wrapper works; it will not have the chew of bread.
  • Keto Crackers — 4g net carbs per 100 g (estimate). For cheese or spread, measured crackers can replace the bread base. The generic cracker estimate requires a check against the chosen brand.
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