Every 100 kcal of sourdough bread brings 4 g of protein. On that measure it ranks 19th of the 111 grains in this database and 525th of all 796 foods on the site. Measured by weight instead, its 10.8 g per 100 g ranks 30th in its group.
Around 16% of the calories in sourdough bread come from protein, so it is more of an energy food than a protein food. It contributes to a day's protein total, but the bulk of what it delivers is energy rather than amino acids - treat it as a contributor alongside a denser source, not as the protein in a meal.
Weight for weight, sourdough bread has 4.5 g of protein for each gram of fat (10.8 g against 2.42 g per 100 g).
Set against instant rice, another grain entry in the database, a serving carries about 0.5 g less protein (instant rice has 3.6 g per 1 cup cooked).
It is an incomplete protein on its own; pairing it with other plant foods across the day covers the full range of essential amino acids. The serving quoted here is measured by weight at 28.4 g, and it covers about 6% of the 50 g FDA Daily Value for protein.
USDA groups sourdough with French and Vienna bread.
Serving sizes
Protein in common portions of sourdough bread
Protein and calories in Sourdough bread for 100 g, the site serving and USDA household portions.
Portion
Weight
Protein
Calories
100 g
100 g
10.8 g
272 kcal
1 oz slice (serving used here)
28.4 g
3.1 g
77 kcal
1 slice
139 g
15 g
378 kcal
Portion weights are the household measures listed on the USDA record; protein and calories scale from the per-100 g figures.
SampleWhat goal trends look like after a week
109 g
Average per logged day
4 of 7
Days goal met
71%
Complete-protein share
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Sample figures for one made-up week against a 110 g goal, not your data. Red bars met the goal. Your own log fills this in with Premium.
Related
Other grains by protein per calorie
Swap for more protein per calorie
Bagel - 4 g per 100 kcal, 11.1 g per 1 medium bagel
10.8 g. The 1 oz slice serving used on this page weighs 28.4 g and so carries 3.1 g.
How much protein do you get per 100 calories of sourdough bread?
4 g. That figure divides its 10.8 g of protein per 100 g by its 272 kcal per 100 g, so it does not depend on serving size.
Is the protein in sourdough bread complete?
No. On its own, the protein in sourdough bread is short of at least one essential amino acid; other protein sources across the day fill the gap.
What share of the protein Daily Value is one serving of sourdough bread?
About 6%. One 1 oz slice serving has 3.1 g, and the FDA Daily Value for protein is 50 g.
Figures from USDA FoodData Central record #172675 (Bread, french or vienna (includes sourdough)), SR Legacy data. USDA data is in the public domain. Values are the published reference figures for that record, not lab measurements for a specific brand or batch.