A typical 1 cup serving of chocolate milk contains 7.9 grams of protein (3.17 g per 100 g), which makes it a good source of protein. That covers roughly 16% of the 50 g reference Daily Value, so it adds toward your protein total for the day.
Around 15% of the calories in chocolate milk 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 81 dairy foods in the database, chocolate milk ranks 31st by protein per serving, and 354th out of all 796 foods on the site. Set against fruit yogurt (lowfat), another dairy food entry in the database, a serving carries about 0.5 g more protein (fruit yogurt (lowfat) has 7.4 g per 1 container).
It is a complete protein - it supplies all nine essential amino acids in adequate amounts, so it can carry a meal's protein on its own. The serving above is measured by volume at 250 g. The per-100 g figure lets you compare it directly against any other food here, whatever its serving.
Source: USDA FoodData Central #170879 - "Milk, chocolate, fluid, commercial, whole, with added vitamin A and vitamin D" (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
Chocolate milk protein FAQ
How much protein is in chocolate milk per 100 g?
Chocolate milk has 3.17 g of protein per 100 g. A typical 1 cup serving (250 g) provides 7.9 g.
Is chocolate milk a complete protein?
Yes. Chocolate milk is a complete protein - it supplies all nine essential amino acids in adequate amounts, so it can carry a meal's protein on its own.
How much of the Daily Value does a serving of chocolate milk cover?
A 1 cup serving of chocolate milk contains 7.9 g of protein, about 16% of the 50 g reference Daily Value.
Is chocolate milk a good source of protein?
Chocolate milk is a good source of protein, and about 15% of its calories come from protein, which makes it more of an energy food than a protein food. Set against fruit yogurt (lowfat), another dairy food entry in the database, a serving carries about 0.5 g more protein (fruit yogurt (lowfat) has 7.4 g per 1 container).