How much protein is in brown rice?

Brown rice is a food people reach for because it’s healthy, so it’s worth being straight about what it does and doesn’t do. On protein, it does very little. A cooked cup gives you only about 5 grams, and per 100 grams it’s just 2.7 g — a number that puts it well below almost anything you’d think of as a protein. That’s not a knock on brown rice; it’s simply the wrong column to judge it by. Rice is a whole-grain carbohydrate staple and a fiber contributor, not a protein source, and the rest of this page is about understanding that honestly.

Why the protein number is so low

The short version is water. Cooked rice is roughly 70% water, and that dilution is most of the story. Dry brown rice carries around 7–8 g of protein per 100 g, but it soaks up two to three times its weight as it cooks, spreading that protein across far more mass. What lands on your plate is about 2.7 g per 100 g, or 5.3 g in a standard cooked cup (195 g) — alongside roughly 240 calories that come overwhelmingly from starch. So when a label or chart shows a higher rice protein figure, the first question is always whether it’s measured dry or cooked. The macro table on this page is for cooked rice, the way you actually eat it.

The protein it has is incomplete — and the fix is beans

There’s a second wrinkle beyond quantity: quality. Protein quality is about whether a food supplies all nine essential amino acids in usable proportions, and brown rice, like almost every grain, falls short on one — lysine. Your body can’t build with what isn’t there, so the modest protein rice does contain is only partly usable on its own.

The fix is older than nutrition science: complementary proteins. Beans and lentils are the mirror image of rice — rich in the lysine grains lack, and short on methionine, which rice supplies. Put them together and the gaps cancel out. That’s exactly why rice and beans shows up across so many cuisines; people landed on a complete amino-acid profile by taste and tradition long before anyone named the mechanism. The important modern update: you don’t have to eat them in the same bowl. Your body keeps a working pool of amino acids, so rice at one meal and beans at another complement each other across the day just fine.

Brown vs. white, and brown vs. quinoa

Against white rice, brown is the better pick for most people — but not for protein, which is about the same in both. The difference is that brown rice keeps the bran and germ, so it carries more fiber, magnesium, and B vitamins that milling strips out of white. The choice between them is really a fiber-and-nutrient choice, with brown ahead.

Against quinoa, brown rice loses on the protein question outright. Cooked quinoa runs about 4.4 g of protein per 100 g to brown rice’s 2.7 g — roughly 60% more — and quinoa is a complete protein, supplying the lysine rice is missing. So if you’re choosing a starchy base specifically to nudge a meal’s protein up, quinoa is the stronger swap, and a rice-and-beans plate beats plain rice too.

None of this means skip the rice. It means use it for what it’s good at — a steady, whole-grain carbohydrate base — and get your protein from what’s next to it on the plate. If you’re working toward a daily protein target, our protein-per-day guide helps you set the number; just don’t expect brown rice to be the thing that gets you there.