Barley flour

One US cup of barley flour weighs between 85 and 148 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 barley flour, stone-ground barley flour, sifted barley flour, barley meal.

Two authoritative sources disagree by 74%, the largest gap for any ingredient currently on this site. King Arthur's Ingredient Weight Chart publishes 1 cup at 85 g, implying a density of 0.3593 g/mL. USDA FoodData Central SR Legacy (FDC 169739, Barley flour or meal) publishes 511 kcal per cup and 345 kcal per 100 g, back-calculating to a cup weight of 148 g and density of 0.6256 g/mL.

The gap is not a measurement error in either source. The USDA record's own name reveals the reason: 'Barley flour or meal' combines two physically distinct products under one entry. Barley meal is a coarser grind, closer in texture to cornmeal than to wheat flour, and packs into a cup with substantially less air space than fine flour. King Arthur's chart specifies barley flour, and its 85 g figure is consistent with a fine, sifted flour spec (their own retail barley flour product is at the fine end of the market). USDA's average combines fine and coarse together and lands near the midpoint, which explains the near-doubling relative to King Arthur.

This is exactly the situation that motivates the site's range-publishing approach. A single published figure for barley flour would be misleading for anyone whose bag is at the other end of the grind spectrum. A shopper buying stone-ground whole-grain barley flour will get a cup weight closer to USDA's 148 g; a shopper buying finely sifted white barley flour will get closer to King Arthur's 85 g. Both are legitimately labeled 'barley flour' in retail.

Home bakers using barley flour in quick breads, Scottish bannocks, Nordic flatbreads or malt-flavored cookies should weigh rather than measure by volume, and be aware that substituting one brand for another may require adjusting either the flour volume or the liquid to compensate. Barley flour contains some gluten (about 5-8% protein depending on variety), but not enough of the specific gluten proteins needed for bread structure. It is used as a partial substitute for wheat flour, typically no more than 25 to 50 percent of the total flour weight in yeasted breads.

Barley flour sits in the milled category alongside all other flours. The 10% category tolerance applies here, and the observed 74% gap between authoritative sources far exceeds it, making the range publish essential rather than optional. This is the site's clearest current example of an ingredient where single-figure conversion charts on other websites are actively misleading.

Related products: barley malt flour is a distinct product with an even higher density (approximately 162 g per cup per USDA), used in commercial bread baking as an enzyme source and mild sweetener. Pearl barley is the whole grain form with different measurement conventions. Barley grits and cracked barley are further intermediate products between whole grain and flour. Roasted barley flour is used in some traditional cereal preparations. None of these are covered by this entry.

No standards body publishes a bulk density for barley flour. Codex Alimentarius standards for barley (CXS 201-1995) cover moisture content, defect tolerances, foreign matter limits and grade rather than physical density. Two authoritative sources with genuinely different product measurements, so this entry is held at low confidence and range published until either a third independent source with a specified grind resolves the split or USDA separates its 'flour or meal' entry into distinct records.