A typical 1 oz serving of feta cheese contains 4 grams of protein (14.2 g per 100 g), which makes it a moderate source of protein. That covers roughly 8% of the 50 g reference Daily Value, so it adds toward your protein total for the day.
Around 21% of the calories in feta cheese come from protein, so it is moderately protein-dense. 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, feta cheese ranks 72nd by protein per serving, and 538th out of all 796 foods on the site. Set against sweetened condensed milk, another dairy food entry in the database, a serving carries about 1 g more protein (sweetened condensed milk has 3 g per 2 tbsp).
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.
Source: USDA FoodData Central #173420 - "Cheese, feta" (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
Feta cheese protein FAQ
How much protein is in feta cheese per 100 g?
Feta cheese has 14.2 g of protein per 100 g. A typical 1 oz serving (28 g) provides 4 g.
Is feta cheese a complete protein?
Yes. Feta cheese 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 feta cheese cover?
A 1 oz serving of feta cheese contains 4 g of protein, about 8% of the 50 g reference Daily Value.
Is feta cheese a good source of protein?
Feta cheese is a moderate source of protein, and about 21% of its calories come from protein, which makes it moderately protein-dense. Set against sweetened condensed milk, another dairy food entry in the database, a serving carries about 1 g more protein (sweetened condensed milk has 3 g per 2 tbsp).