Protein content
A 1/2 cup serving of natto contains 17.1 g of protein - a very good source of protein, about 34% of the 50 g Daily Value.
Share of this food's calories that come from protein - it is very protein-dense.
| Serving | 1/2 cup (88 g) |
|---|---|
| Protein per serving | 17.1 g |
| Protein per 100 g | 19.4 g |
| Calories per serving | 186 kcal |
| Protein density | 37% of calories |
| Share of 50 g Daily Value | 34% |
| Protein quality | Complete protein |
| Category | Soy foods |
| Food type | Whole food |
| USDA record | FoodData Central #172443 |
A typical 1/2 cup serving of natto contains 17.1 grams of protein (19.4 g per 100 g), which makes it a very good source of protein. That covers roughly 34% of the 50 g reference Daily Value, so it can anchor a high-protein meal for the day.
Protein accounts for roughly 37% of the calories in natto, making it very 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 31 soy foods in the database, natto ranks 5th by protein per serving, and 207th out of all 796 foods on the site. Set against veggie burger, another soy food entry in the database, a serving carries about 1.4 g more protein (veggie burger has 15.7 g per 1 patty).
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 88 g. The per-100 g figure lets you compare it directly against any other food here, whatever its serving.
One of the few plant foods that is a complete protein, with all nine essential amino acids.
Source: USDA FoodData Central #172443 - "Natto" (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
Natto has 19.4 g of protein per 100 g. A typical 1/2 cup serving (88 g) provides 17.1 g.
Yes. Natto 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.
A 1/2 cup serving of natto contains 17.1 g of protein, about 34% of the 50 g reference Daily Value.
Natto is a very good source of protein, and about 37% of its calories come from protein, which makes it very protein-dense. Set against veggie burger, another soy food entry in the database, a serving carries about 1.4 g more protein (veggie burger has 15.7 g per 1 patty).
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