A typical 1 cup serving of grapes contains 1.1 grams of protein (0.72 g per 100 g), which makes it only a minor source of protein. That covers roughly 2% of the 50 g reference Daily Value, so it adds toward your protein total for the day.
Only about 4% of the calories in grapes 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, grapes ranks 37th by protein per serving, and 722nd out of all 796 foods on the site. Set against canned peaches, another fruit entry in the database, a serving carries about 0.5 g less protein (canned peaches has 1.6 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 151 g. The per-100 g figure lets you compare it directly against any other food here, whatever its serving.
Source: USDA FoodData Central #174683 - "Grapes, red or green (European type, such as Thompson seedless), 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
Grapes protein FAQ
How much protein is in grapes per 100 g?
Grapes has 0.72 g of protein per 100 g. A typical 1 cup serving (151 g) provides 1.1 g.
Is grapes a complete protein?
No. Grapes 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 grapes cover?
A 1 cup serving of grapes contains 1.1 g of protein, about 2% of the 50 g reference Daily Value.
Is grapes a good source of protein?
Grapes 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 peaches, another fruit entry in the database, a serving carries about 0.5 g less protein (canned peaches has 1.6 g per 1 cup).