A typical 1 slice serving of potato bread contains 4 grams of protein (12.5 g per 100 g), which makes it a moderate source of protein. That covers roughly 8% of the 50 g reference Daily Value, so it adds toward your protein total for the day.
Around 19% of the calories in potato 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.
Among the 111 grains in the database, potato bread ranks 59th by protein per serving, and 538th out of all 796 foods on the site. Set against barley, another grain entry in the database, a serving carries about 0.5 g more protein (barley has 3.5 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 above is counted by piece at 32 g. Because pieces vary, the per-100 g figure is the one to use when comparing this against a food measured a different way.
Source: USDA FoodData Central #167943 - "Bread, potato" (SR Legacy, published 4/1/2019). Values are the published reference figures for that record, not lab measurements for a specific brand or batch.
Quick answers
Potato bread protein FAQ
How much protein is in potato bread per 100 g?
Potato bread has 12.5 g of protein per 100 g. A typical 1 slice serving (32 g) provides 4 g.
Is potato bread a complete protein?
No. Potato bread is an incomplete protein on its own; pairing it with other protein sources across the day covers the full range of essential amino acids.
How much of the Daily Value does a serving of potato bread cover?
A 1 slice serving of potato bread contains 4 g of protein, about 8% of the 50 g reference Daily Value.
Is potato bread a good source of protein?
Potato bread is a moderate source of protein, and about 19% of its calories come from protein, which makes it more of an energy food than a protein food. Set against barley, another grain entry in the database, a serving carries about 0.5 g more protein (barley has 3.5 g per 1 cup cooked).