A typical 1 regular slice serving of pumpernickel bread contains 2.3 grams of protein (8.7 g per 100 g), which makes it only a minor source of protein. That covers roughly 5% of the 50 g reference Daily Value, so it adds toward your protein total for the day.
Around 14% of the calories in pumpernickel 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, pumpernickel bread ranks 101st by protein per serving, and 633rd out of all 796 foods on the site. Set against matzo, another grain entry in the database, a serving carries about 0.5 g less protein (matzo has 2.8 g per 1 matzo).
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 26 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 #174918 - "Bread, pumpernickel" (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
Pumpernickel bread protein FAQ
How much protein is in pumpernickel bread per 100 g?
Pumpernickel bread has 8.7 g of protein per 100 g. A typical 1 regular slice serving (26 g) provides 2.3 g.
Is pumpernickel bread a complete protein?
No. Pumpernickel 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 pumpernickel bread cover?
A 1 regular slice serving of pumpernickel bread contains 2.3 g of protein, about 5% of the 50 g reference Daily Value.
Is pumpernickel bread a good source of protein?
Pumpernickel bread is only a minor source of protein, and about 14% of its calories come from protein, which makes it more of an energy food than a protein food. Set against matzo, another grain entry in the database, a serving carries about 0.5 g less protein (matzo has 2.8 g per 1 matzo).