Rice flour is not low carb. With roughly 78 grams of carbohydrates per 100 grams, it is one of the highest-carb flours available. A single cup of white rice flour contains about 127 grams of total carbohydrates, making it incompatible with ketogenic and most low-carb diets.
How Rice Flour Compares to Low-Carb Flours
Rice flour sits near the top of the carbohydrate scale among common flours. Per 100 grams, rice flour contains 78.2 grams of carbs. Tapioca flour is higher at 89.5 grams, and corn flour comes in at 86 grams. But these are all high-carb flours by any standard.
Coconut flour, by contrast, contains just 34.6 grams of carbs per 100 grams, and nearly half of that is dietary fiber (30.7 grams per 100 grams), bringing its net carbs down dramatically. Almond flour typically falls in a similar range, with most of its calories coming from fat rather than carbohydrates. Legume-based flours (like chickpea flour) land in the middle, with moderate carbs but significantly more fiber at 14.7 grams per 100 grams.
If you’re looking for a flour that fits a low-carb lifestyle, coconut flour or almond flour are the go-to substitutes. They behave differently in baking (coconut flour absorbs far more liquid, almond flour produces denser results), but they cut carbs by more than half compared to rice flour.
White Rice Flour vs. Brown Rice Flour
Switching to brown rice flour doesn’t change the picture much. A cup of white rice flour has about 127 grams of carbs with 4 grams of fiber. Brown rice flour has 121 grams of carbs with 7 grams of fiber. That extra 3 grams of fiber brings the net carbs down slightly, from roughly 123 grams to 114 grams per cup. Brown rice flour also provides a bit more protein (11 grams vs. 9 grams) and fat (4 grams vs. 2 grams).
These differences are nutritionally meaningful in a general diet, since the extra fiber and micronutrients from the bran layer matter over time. But for carb counting purposes, both versions are firmly in the high-carb category.
Why Rice Flour Is Especially High-Impact
Beyond the raw carb count, the type of starch in most rice flour makes it digest quickly. Most commercially available rice flour comes from standard white or low-amylose rice varieties. The starch in these varieties breaks down rapidly in your small intestine, causing a faster rise in blood sugar. USDA research on rice starch digestibility found that low-amylose rice starch contains nearly 32% rapidly digestible starch and only about 10% resistant starch, the type your body can’t absorb.
High-amylose rice varieties tell a different story. Their starch is over 55% resistant starch, meaning more than half passes through the small intestine undigested, functioning more like fiber. But high-amylose rice flour is a specialty product that most people won’t find at a regular grocery store.
Cooling also plays a small role. When cooked rice products are cooled for 24 hours in a refrigerator and then reheated, resistant starch roughly doubles, from about 0.64 grams per 100 grams to 1.65 grams. A clinical study found this cooling method produced a measurably lower blood sugar response. However, the effect is modest. Going from less than 1 gram to less than 2 grams of resistant starch per 100 grams doesn’t transform rice flour into a low-carb ingredient.
Can You Use Rice Flour on Keto?
Standard ketogenic diets limit total carbs to 20 to 50 grams per day. A single quarter-cup of rice flour, roughly the amount you might use to bread a piece of chicken, contains about 32 grams of carbs. That alone could use up your entire daily allowance. Even small amounts, like a tablespoon used to thicken a sauce (around 8 grams of carbs), add up quickly when your budget is that tight.
Rice flour is also flagged as a food to avoid on keto because it’s a refined, starch-dense carbohydrate with minimal fiber or fat to slow absorption. For thickening sauces on a low-carb diet, alternatives like xanthan gum or ground flaxseed work without the carb load. For baking, blends of almond flour and coconut flour can replicate many of the textures people use rice flour for, particularly in gluten-free recipes where rice flour is a common default.
Who Rice Flour Works For
Rice flour is a practical choice for people who need a gluten-free flour and aren’t restricting carbohydrates. It produces a lighter texture than many alternative flours, works well in Asian cooking (rice noodles, mochi, tempura batters), and is widely available. It’s also one of the least allergenic flours, which makes it useful for people managing multiple food sensitivities.
But if your goal is reducing carbohydrate intake, rice flour works against you. At 78 grams of carbs per 100 grams, very little fiber, and a starch profile that digests quickly, it behaves more like pure starch than like a whole-food ingredient. For low-carb baking and cooking, coconut flour, almond flour, or seed-based flours are better fits by a wide margin.