Non-Diastatic Malt Powder

One US cup of non-diastatic malt powder weighs between 128 and 162 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 non-diastatic malt powder, nondiastatic malt powder, malt powder, barley malt powder, barley malt extract powder, dry malt extract, DME, roasted malted barley flour, non-diastatic malted barley flour.

TL;DR: two commercially distinct products both sold as "non-diastatic malt powder" — spray-dried barley malt extract (King Arthur, Kalustyan's) and roasted malted barley flour (Modernist Pantry, Briess) — with density spanning 128-162 g/cup across both forms. Read the ingredient statement and weigh the specific product you have.

Non-diastatic malt powder is one name covering two products with different manufacturing paths and different behaviors on a scale. The first is barley malt extract in dry form: barley malt syrup spray-dried into a fine, hygroscopic powder. King Arthur's Non-Diastatic Malt Powder (product #100322) is this type — the ingredient statement reads simply "barley malt extract," used at 30 calories per tablespoon as essentially a dry malt sweetener with color and flavor. Kalustyan's Non-Diastatic Barley Malt Powder is a close cousin, with corn dextrose added. The second product is roasted malted barley flour: whole malted barley grains kiln-heated above the enzyme-denaturing temperature and then milled into flour. Modernist Pantry sells this as 100% pure malted barley, and Briess's BriesSpecialty Nondiastatic line is the commercial equivalent used by professional bakeries. Both products are enzyme-inactive (hence "non-diastatic") and both go into bagels and breads for malty flavor and amber crust color, but they are not interchangeable on volume.

Density data spans a wide range that reflects this split. King Arthur's Ingredient Weight Chart lists non-diastatic malt powder at 2 tablespoons = 18 g, extrapolating to 144 g/cup. But King Arthur's own product label on the same item reads 1 tablespoon = 8 g — extrapolating to 128 g/cup, a 12.5% self-contradiction that almost certainly comes from the chart using a heaping-tablespoon convention where the label uses level. Both figures describe the same extract-based product. At the other end, USDA FoodData Central entry 169740 for "barley malt flour" gives 1 cup = 162 g, corresponding to a milled whole-grain product. The honest published range for anything sold under this name is 128 to 162 g/cup, or roughly 0.54 to 0.68 g/mL, spanning a 27% gap that no single-figure conversion can resolve without knowing which product is actually in the bag.

Physical behavior differs too. The extract is a sweeter, glassier powder that clumps against humid air and dissolves quickly in dough water; the flour behaves like whole wheat flour on the scoop but browns more aggressively in the crust. Substitution is not one-for-one on volume: a tablespoon of extract contributes more sugar and less starch than a tablespoon of flour. In yeasted doughs the practical usage rate is 0.5 to 2 percent of flour weight regardless of form, so precision at the tablespoon level matters less than getting the total percentage right. For bagel poaching liquids and enriched doughs where malt flavor drives the outcome, the extract form delivers a more concentrated hit per gram.

Within the malt family, non-diastatic malt powder sits between diastatic malt powder (96 to 168 g/cup, enzyme-active, used at 0.25 to 1 percent for dough conditioning) and malted milk powder (140 g/cup, a blend with milk solids and wheat flour, distinct flavor). Barley malt syrup at 336 g/cup is the liquid form of the extract product — the powder is essentially the same solids evaporated dry. Diastatic and non-diastatic forms are not interchangeable when enzymatic activity matters: using non-diastatic where diastatic is called for produces a slower rise and less oven spring; the reverse can produce a gummy crumb from over-active starch breakdown. For the home baker the practical rule is to read the ingredient statement before treating any figure as authoritative, and weigh the specific product in hand.