Brown rice flour

One US cup of brown rice flour weighs between 128 and 158 grams, depending on how the cup is filled and which source measured it. That range is the answer; a single number would not be. Every figure behind it is below, with the method each source used.

Also called whole grain brown rice flour, organic brown rice flour, gluten-free brown rice flour, stone-ground brown rice flour.

Two authoritative sources disagree by 23.4%, well over the 10% milled tolerance. USDA FoodData Central SR Legacy publishes 574 calories per US cup and 363 calories per 100 g for brown rice flour, back-calculating to a cup weight of 158 g and density of 0.6679 g/mL. King Arthur's Ingredient Weight Chart lists brown rice flour at 128 g per cup, implying 0.5411 g/mL. Both are authoritative sources, and the gap between them is real: USDA Branded Foods records for common commercial brands confirm brown rice flour's cup weight varies from approximately 120 g (Anthony's, 30 g per 1/4 cup serving) to 160 g (Bob's Red Mill, 40 g per 1/4 cup), a 33% span driven by grind fineness.

Brown rice flour is produced by milling whole brown rice kernels including the bran and germ. Different manufacturers use different final grinds. Fine 'baby' grinds intended for delicate baked goods trap more air and pack less densely; coarser 'meal-style' grinds intended for gluten-free bread mixes pack tighter. King Arthur sits near the low end of the range, consistent with baking-focused sourcing where finer grinds dominate. USDA's SR Legacy figure sits at the high end, likely reflecting a coarser reference sample from earlier commercial practice when whole-grain flours were less commonly used in home baking.

This entry publishes the range 128 to 158 g per cup, at low confidence, because averaging the two figures would produce a number no manufacturer's product actually matches. Home bakers using brown rice flour in gluten-free blends should weigh rather than measure by volume: a 30 g error over a cup meaningfully changes hydration and crumb structure in bread and pastry recipes. This matters more for gluten-free baking than for wheat baking because gluten-free flours lack the elastic network that tolerates hydration variance.

The pattern mirrors this site's existing entry for white rice flour, which publishes the same 128 to 158 g range for the same underlying reason. Rice flour, whether brown or white, is inherently a range-publish ingredient across the source hierarchy this site uses. The whole-grain composition of brown rice flour (bran and germ retained during milling) does not measurably affect bulk density compared to refined white rice flour, though it changes protein, fiber and mineral content substantially and shortens shelf life due to the oils in the bran.

Brown rice flour sits in the milled category alongside all other flours. The 10% category tolerance applies here, and the observed 23% gap between authoritative sources clearly exceeds it. Range publish is the honest outcome.

Related products: white rice flour is covered by a separate entry with the same range. Sweet or glutinous rice flour is a distinct product (from short-grain glutinous rice) not yet covered by this site because King Arthur has no dedicated row and USDA data is thin. Brown rice cooked is a separate case not published here: cooked ingredients change weight dramatically through water absorption and are outside this site's cup-to-gram uncooked baseline. Rice bran and rice germ, sometimes sold separately as nutritional supplements, are distinct products with distinct densities.

No standards body publishes a bulk density for rice flour. Codex Alimentarius standards for rice (CXS 198-1995) cover moisture content, grade and foreign material tolerance but not physical density. Two authoritative sources with real brand variation, so this entry is held at low confidence and range published until a third independent source resolves the split.