Dry milk powder

For instant nonfat dry milk (grocery), one US cup of dry milk powder weighs between 68 and 92 grams (2.4 to 3.2 ounces), 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.

Non-instant (spray-dried) nonfat dry milk: 112–148 g (4–5.2 oz) per cup; Whole milk powder: 100–120 g (3.5–4.2 oz) per cup.

TL;DR: Dry milk powder ranges from 68 g/cup (grocery-store instant nonfat) to 148 g/cup (King Arthur's extra-fine Baker's Special) — a 2x spread driven by drying method, not by fat content.

Dry milk powder is dehydrated milk sold as a shelf-stable ingredient for baking, cooking, and beverage reconstitution. Bakers add it to bread doughs for softer crumb and longer shelf life — particularly enriched breads, hamburger buns, and dinner rolls — and to ice creams for richness. Cup-weight confusion is severe because "dry milk" spans multiple physically distinct products at the same shelf label.

The dominant variable is drying method, not fat content. Modern grocery-store dry milk is almost always instant (agglomerated): the powder is briefly re-wetted and re-dried to form porous clumps that dissolve quickly in cold water. Those clumps trap air, so a cup of instant powder weighs far less than the same volume of the fine spray-dried powder professional bakers use. Fat content nudges density by a smaller amount than processing does.

Instant nonfat dry milk — Carnation Instant, Great Value, Publix, Meijer, Signature Select — converges near 68 g/cup at the grocery-shelf end. Nutrition labels from five separate brands all list 23g per 1/3 cup, and USDA branded food data for their UPCs confirms 68-74 g/cup. Honeyville's bulk emergency-food instant nonfat runs denser at 88 g/cup, and Carnation's baking-line label pushes to 92 g/cup. Range: 68-92 g/cup, driven by how heavily the instant processing has agglomerated the specific product.

Non-instant nonfat dry milk is the baking-supply form: fine spray-dried powder that requires whisking or blending to dissolve. USDA data for Bob's Red Mill Non-Fat Dry Milk Powder (UPC 039978115201) lists 128 g/cup; King Arthur's chart entry for Dried nonfat milk (powdered) gives 112 g/cup. King Arthur's Baker's Special (extra-fine granules marketed for professional bakers) tops the range at 148 g/cup per King Arthur's own nutrition label — though notably their Ingredient Weight Chart lists it at 112 g/cup, identical to their generic nonfat entry, a 32% self-contradiction that the label figure resolves in favor of the denser reading. The Army Quartermaster recipe manual makes the distinction explicit: instant nonfat dry milk may be substituted pound-for-pound for non-instant but not measure-for-measure, because the cup measures differ.

Whole milk powder spans 100 g/cup (King Arthur's non-instant Dried Whole Milk, per their chart at 50g per 1/2 cup) to 120 g/cup (Nestle NIDO Fortificada, an instant whole milk product with USDA-branded data at 30g per 1/4 cup). Same fat content, different processing, different cup weight.

Practical recommendation: identify your specific product before converting. Grocery-store instant nonfat sits near 68 g/cup. Baking-supply non-instant nonfat runs 112-148 g/cup depending on grind fineness. Instant whole milk (NIDO) sits at 120 g/cup. King Arthur's non-instant Dried Whole Milk drops to 100 g/cup. If the label doesn't tell you the drying method, check reconstitution instructions: instant products dissolve in cold water with stirring; non-instant products need warm water or whisking. Given the 2x possible spread, weighing on a scale is the only path to recipe precision.