A typical 1/4 cup serving of cornmeal contains 2.5 grams of protein (8.12 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.
Only about 9% of the calories in cornmeal 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, cornmeal ranks 97th by protein per serving, and 625th out of all 796 foods on the site. Set against whole wheat crackers, another grain entry in the database, a serving carries about 0.5 g less protein (whole wheat crackers has 3 g per 1 oz).
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 measured by volume at 30.5 g. The per-100 g figure lets you compare it directly against any other food here, whatever its serving.
Source: USDA FoodData Central #169697 - "Cornmeal, whole-grain, yellow" (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
Cornmeal protein FAQ
How much protein is in cornmeal per 100 g?
Cornmeal has 8.12 g of protein per 100 g. A typical 1/4 cup serving (30.5 g) provides 2.5 g.
Is cornmeal a complete protein?
No. Cornmeal 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 cornmeal cover?
A 1/4 cup serving of cornmeal contains 2.5 g of protein, about 5% of the 50 g reference Daily Value.
Is cornmeal a good source of protein?
Cornmeal 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 whole wheat crackers, another grain entry in the database, a serving carries about 0.5 g less protein (whole wheat crackers has 3 g per 1 oz).