A typical 1 cup serving of puffed rice contains 0.9 grams of protein (6.3 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 6% of the calories in puffed rice 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 111 grains in the database, puffed rice ranks 109th by protein per serving, and 738th out of all 796 foods on the site. Set against raisin bread, another grain entry in the database, a serving carries about 1.2 g less protein (raisin bread has 2.1 g per 1 slice).
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 14 g. The per-100 g figure lets you compare it directly against any other food here, whatever its serving.
Source: USDA FoodData Central #173912 - "Cereals ready-to-eat, rice, puffed, fortified" (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
Puffed rice protein FAQ
How much protein is in puffed rice per 100 g?
Puffed rice has 6.3 g of protein per 100 g. A typical 1 cup serving (14 g) provides 0.9 g.
Is puffed rice a complete protein?
No. Puffed rice 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 puffed rice cover?
A 1 cup serving of puffed rice contains 0.9 g of protein, about 2% of the 50 g reference Daily Value.
Is puffed rice a good source of protein?
Puffed rice is only a minor source of protein, and about 6% of its calories come from protein, which makes it more of an energy food than a protein food. Set against raisin bread, another grain entry in the database, a serving carries about 1.2 g less protein (raisin bread has 2.1 g per 1 slice).