A typical 1 medium serving of red potatoes contains 4 grams of protein (2.3 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.
Only about 11% of the calories in red potatoes come from protein, so it is more of an energy food than a protein food. It is worth eating for other reasons; the protein it adds to a day is incidental.
Among the 105 vegetables in the database, red potatoes ranks 18th by protein per serving, and 538th out of all 796 foods on the site. Set against artichoke, another vegetable entry in the database, a serving carries about 0.5 g more protein (artichoke has 3.5 g per 1 medium).
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 counted by piece at 173 g. Because pieces vary, the per-100 g figure is the one to use when comparing this against a food measured a different way.
Source: USDA FoodData Central #170435 - "Potatoes, red, flesh and skin, baked" (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
Red potatoes protein FAQ
How much protein is in red potatoes per 100 g?
Red potatoes has 2.3 g of protein per 100 g. A typical 1 medium serving (173 g) provides 4 g.
Is red potatoes a complete protein?
No. Red potatoes 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 red potatoes cover?
A 1 medium serving of red potatoes contains 4 g of protein, about 8% of the 50 g reference Daily Value.
Is red potatoes a good source of protein?
Red potatoes is a moderate source of protein, and about 11% of its calories come from protein, which makes it more of an energy food than a protein food. Set against artichoke, another vegetable entry in the database, a serving carries about 0.5 g more protein (artichoke has 3.5 g per 1 medium).