Barley Flakes

One US cup of barley flakes weighs between 80 and 98 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 barley flakes, rolled barley flakes, rolled barley, flaked barley, barley cereal flakes.

TL;DR: 80-98 g/cup (0.34-0.41 g/mL). Retail producer labels span a 22% range across four brands; the central cluster at 88-92 g/cup (King Arthur and Bob's Red Mill within 4.5% of each other) is the working figure most home-baker recipes assume, with Shiloh Farms denser at 98 and Natural Grocers lighter at 80. The spread reflects real roll-thickness variance in the same way rolled oats vary between quick, old-fashioned, and extra-thick cuts.

Barley flakes are whole barley kernels — hulled or hulless (the inedible outer hull removed but the bran retained) — that have been steamed to soften the grain, passed through steel rollers to flatten them into flakes, and dried. The process is identical to rolled oats and produces a product that behaves the same way on the scoop, on the stove, and in the oven. The finished flake is roughly 89% carbohydrate by weight (with 5-6 grams of the beta-glucan soluble fiber that earned barley its FDA and Health Canada cholesterol health claims), 14% protein, and 5% fat, packing at a bulk density of 0.34-0.41 g/mL depending on how thick the miller set the roll.

Density data forms a central cluster and two outliers. King Arthur's Ingredient Weight Chart lists 1/2 cup = 46 g, extrapolating to 92 g/cup at 0.389 g/mL. Bob's Red Mill Rolled Barley Flakes lists 1/4 cup = 22 g on the label, extrapolating to 88 g/cup at 0.372 g/mL. These two dominant home-baker brands agree within 4.5%, defining the working figure most baking recipes assume when they call for barley flakes unqualified. Shiloh Farms sits denser at 98 g/cup (1/2 cup = 49 g), typical of a coarser/thicker roll; Natural Grocers sits lighter at 80 g/cup (1/2 cup = 40 g), typical of a finer/quicker-cooking roll. The full 80-98 range is honest publication for products actually sold under this name.

Barley comes in five commercial forms and it is important not to confuse them. Barley flakes (this entry) are whole barley kernels rolled flat, a whole grain product. Barley flour (already in this database) is ground barley, either from whole hulled kernels or from pearl barley, and packs at a much higher density typical of the flour cluster. Pearl barley is whole barley polished to remove the bran (not a whole grain, faster cooking, common in soups). Hulled barley is the whole grain with only the inedible hull removed, the least processed form. Barley grits are cracked or broken kernel pieces sold as a hot cereal or side dish. Of these five, flakes, hulled, pearl, and grits are still recognizable as whole or partial kernels; only barley flour is milled to powder.

Within this database, barley flakes at 80-98 g/cup sits in the same density band as rolled oats (KA chart figure roughly 85 g/cup), which is expected since both are steamed-and-rolled whole cereal grain kernels of similar bulk density. Wheat berries (whole intact kernels, unrolled) pack denser at around 180-190 g/cup because the intact grain has no air gaps between flakes. In practical baking, barley flakes substitute 1:1 by weight for rolled oats in muesli, granola, cookies, and bread toppings, delivering a slightly nuttier flavor and more chew. In hot cereal, they cook in 10-15 minutes to a creamy porridge with more body than oatmeal from the higher beta-glucan content. As a bread ingredient, adding 5-15% barley flakes to a wheat dough produces the classic Scottish-Nordic multigrain loaf character with darker crust color and hearty texture. Complete substitution for rolled oats works in almost every recipe; the flavor difference is noticeable but not disruptive.