A typical 1 cup cooked serving of cauliflower contains 2.3 grams of protein (1.84 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.
Protein accounts for roughly 32% of the calories in cauliflower, 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 105 vegetables in the database, cauliflower ranks 41st by protein per serving, and 633rd out of all 796 foods on the site. Set against oyster mushrooms, another vegetable entry in the database, a serving carries about 0.5 g less protein (oyster mushrooms has 2.8 g per 1 cup sliced).
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 124 g. The per-100 g figure lets you compare it directly against any other food here, whatever its serving.
Source: USDA FoodData Central #170397 - "Cauliflower, cooked, boiled, drained, without salt" (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
Cauliflower protein FAQ
How much protein is in cauliflower per 100 g?
Cauliflower has 1.84 g of protein per 100 g. A typical 1 cup cooked serving (124 g) provides 2.3 g.
Is cauliflower a complete protein?
No. Cauliflower 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 cauliflower cover?
A 1 cup cooked serving of cauliflower contains 2.3 g of protein, about 5% of the 50 g reference Daily Value.
Is cauliflower a good source of protein?
Cauliflower is only a minor source of protein, and about 32% of its calories come from protein, which makes it moderately protein-dense. Set against oyster mushrooms, another vegetable entry in the database, a serving carries about 0.5 g less protein (oyster mushrooms has 2.8 g per 1 cup sliced).