A typical 1 oz serving of mozzarella (whole milk) contains 6.2 grams of protein (22.2 g per 100 g), which makes it a moderate source of protein. That covers roughly 12% of the 50 g reference Daily Value, so it adds toward your protein total for the day.
Protein accounts for roughly 30% of the calories in mozzarella (whole milk), making it moderately protein-dense. The rest comes from fat and carbohydrate, so it adds a solid amount of protein while still carrying real energy - useful when you are eating to a calorie target rather than under one.
Among the 81 dairy foods in the database, mozzarella (whole milk) ranks 56th by protein per serving, and 424th out of all 796 foods on the site. Set against drinkable yogurt, another dairy food entry in the database, a serving carries about 0.7 g more protein (drinkable yogurt has 5.5 g per 1 bottle).
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 weight at 28 g. The per-100 g figure lets you compare it directly against any other food here, whatever its serving.
Whole-milk mozzarella has slightly less protein per ounce than part-skim.
Source: USDA FoodData Central #170845 - "Cheese, mozzarella, whole milk" (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
Mozzarella (whole milk) protein FAQ
How much protein is in mozzarella (whole milk) per 100 g?
Mozzarella (whole milk) has 22.2 g of protein per 100 g. A typical 1 oz serving (28 g) provides 6.2 g.
Is mozzarella (whole milk) a complete protein?
Yes. Mozzarella (whole 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 mozzarella (whole milk) cover?
A 1 oz serving of mozzarella (whole milk) contains 6.2 g of protein, about 12% of the 50 g reference Daily Value.
Is mozzarella (whole milk) a good source of protein?
Mozzarella (whole milk) is a moderate source of protein, and about 30% of its calories come from protein, which makes it moderately protein-dense. Set against drinkable yogurt, another dairy food entry in the database, a serving carries about 0.7 g more protein (drinkable yogurt has 5.5 g per 1 bottle).