A typical 1 crispbread serving of rye crispbread contains 0.8 grams of protein (7.9 g per 100 g), which makes it only a minor source of protein. That covers roughly 2% of the 50 g reference Daily Value, so it adds toward your protein total for the day.
Only about 9% of the calories in rye crispbread come from protein, so it is more of an energy food than a protein food. It is worth eating for other reasons; the protein it adds to a day is incidental.
Among the 111 grains in the database, rye crispbread ranks 110th by protein per serving, and 752nd out of all 796 foods on the site. Set against corn tortilla, another grain entry in the database, a serving carries about 0.6 g less protein (corn tortilla has 1.4 g per 1 tortilla).
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 10 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 #172739 - "Crackers, crispbread, rye" (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
Rye crispbread protein FAQ
How much protein is in rye crispbread per 100 g?
Rye crispbread has 7.9 g of protein per 100 g. A typical 1 crispbread serving (10 g) provides 0.8 g.
Is rye crispbread a complete protein?
No. Rye crispbread 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 rye crispbread cover?
A 1 crispbread serving of rye crispbread contains 0.8 g of protein, about 2% of the 50 g reference Daily Value.
Is rye crispbread a good source of protein?
Rye crispbread is only a minor source of protein, and about 9% of its calories come from protein, which makes it more of an energy food than a protein food. Set against corn tortilla, another grain entry in the database, a serving carries about 0.6 g less protein (corn tortilla has 1.4 g per 1 tortilla).