A typical 1 cup whole serving of cranberries contains 0.5 grams of protein (0.46 g per 100 g), which makes it only a minor source of protein. That covers roughly 1% of the 50 g reference Daily Value, so it adds toward your protein total for the day.
Only about 4% of the calories in cranberries 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 71 fruits in the database, cranberries ranks 63rd by protein per serving, and 774th out of all 796 foods on the site. Set against canned pineapple, another fruit entry in the database, a serving carries about 0.5 g less protein (canned pineapple has 1 g per 1 cup).
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 100 g. The per-100 g figure lets you compare it directly against any other food here, whatever its serving.
Source: USDA FoodData Central #171722 - "Cranberries, 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
Cranberries protein FAQ
How much protein is in cranberries per 100 g?
Cranberries has 0.46 g of protein per 100 g. A typical 1 cup whole serving (100 g) provides 0.5 g.
Is cranberries a complete protein?
No. Cranberries 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 cranberries cover?
A 1 cup whole serving of cranberries contains 0.5 g of protein, about 1% of the 50 g reference Daily Value.
Is cranberries a good source of protein?
Cranberries is only a minor source of protein, and about 4% of its calories come from protein, which makes it more of an energy food than a protein food. Set against canned pineapple, another fruit entry in the database, a serving carries about 0.5 g less protein (canned pineapple has 1 g per 1 cup).