A typical 1 cup chopped serving of green bell pepper contains 1.3 grams of protein (0.86 g per 100 g), which makes it only a minor source of protein. That covers roughly 3% of the 50 g reference Daily Value, so it adds toward your protein total for the day.
Around 17% of the calories in green bell pepper 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 105 vegetables in the database, green bell pepper ranks 72nd by protein per serving, and 706th out of all 796 foods on the site. Set against butternut squash, another vegetable entry in the database, a serving carries about 0.5 g less protein (butternut squash has 1.8 g per 1 cup cubes baked).
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 149 g. The per-100 g figure lets you compare it directly against any other food here, whatever its serving.
Source: USDA FoodData Central #170427 - "Peppers, sweet, green, raw" (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
Green bell pepper protein FAQ
How much protein is in green bell pepper per 100 g?
Green bell pepper has 0.86 g of protein per 100 g. A typical 1 cup chopped serving (149 g) provides 1.3 g.
Is green bell pepper a complete protein?
No. Green bell pepper 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 green bell pepper cover?
A 1 cup chopped serving of green bell pepper contains 1.3 g of protein, about 3% of the 50 g reference Daily Value.
Is green bell pepper a good source of protein?
Green bell pepper is only a minor source of protein, and about 17% of its calories come from protein, which makes it more of an energy food than a protein food. Set against butternut squash, another vegetable entry in the database, a serving carries about 0.5 g less protein (butternut squash has 1.8 g per 1 cup cubes baked).