Quick Oats

One US cup of quick oats weighs between 80 and 90 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 quick oats, quick-cooking oats, quick cooking oats, 1-minute oats, one minute oats, quick rolled oats, quick cooking rolled oats.

TL;DR: Quick oats span a genuine 80-90 gram per cup range depending on brand, with Quaker (the US market leader) at 80 g/cup and Bob's Red Mill and King Arthur Baking at 89-90 g/cup; the gap reflects real differences in flake thickness rather than measurement error, so weigh by the specific brand on hand.

Quick oats are made from full oat groats that have been steamed and either rolled thinner or cut smaller (or both) before rolling, so they hydrate in a minute rather than the five-plus minutes needed for old-fashioned rolled oats. There is no strict industry definition of "quick" — each mill sets its own flake specification, and the resulting cup density spans a genuine 80 to 90 gram per cup range that exceeds the 10% tolerance normally applied to milled ingredients.

Quaker Quick 1-Minute Oats, which dominates the US retail market, lists 40 g per half-cup dry on its Nutrition Facts panel, giving exactly 80 g/cup. USDA's Standard Reference record for "Cereals, QUAKER, Quick Oats, Dry" pins the same 80 g/cup, and USDA's Global Branded Food Products Database shows convergence at 80 g/cup across multiple Quaker-adjacent private-label products including Great Value 100% Whole Grain Quick Oats (UPC 078742434087). This cluster represents the thinner, lightweight flake typical of the largest-volume commercial quick-oat products, produced by cutting the oat groat small and then rolling the pieces very thin.

Bob's Red Mill Quick Cooking Rolled Oats lists 45 g per half-cup, giving 90 g/cup — a full 12.5% denser than Quaker Quick. King Arthur Baking's ingredient weight chart lumps "old-fashioned or quick-cooking oats" together at 89 g/cup, aligning with the Bob's cluster and separating from KA's own branded rolled oat figure of 113 g/cup. Both 89-90 figures reflect a thicker-flake process where the oat groat is first cut steel-cut style, then steamed and rolled to a moderate thickness rather than pressed thin.

Physically, the gap is not a measurement error — it is real product variance driven by flake dimensions. Thinner, smaller flakes (Quaker-style) are lofty and trap more air per unit volume when scooped. Thicker, chunkier flakes (Bob's-style) are denser individual pieces that pack together with less void space. This is not a King Arthur correction candidate; KA at 89 is legitimate for the products it describes, just as Quaker at 80 is legitimate for its.

For practical baking, the flake-thickness difference matters most where the oat is expected to absorb moisture during rest — overnight oats, muffin batter, cookie doughs that sit in the fridge. Thinner Quaker-style flakes hydrate faster and produce a softer set; thicker Bob's-style flakes hold structure longer and give a chewier finish. In dry mixes like granola or in cookies baked immediately after mixing, both work but the finished texture will differ visibly. When precision matters, use the label figure on your specific package: 80 g/cup for a Quaker-labeled or Quaker-equivalent private-label product, 90 g/cup for Bob's Red Mill, and check the panel on any other brand. Substituting quick oats for old-fashioned rolled oats by volume is imprecise regardless — rolled oats run around 89-99 g/cup themselves — but the by-weight swap works cleanly when both flakes are similar-style; a Quaker-to-Bob's cross-brand swap by cup misses by roughly 10 grams.