Ingredient Weight Converter · grain
Rolled Oats: cups to grams
1 cup of rolled oats weighs 81 grams. Use the converter below for any other amount, or check the quick-reference table.
Rolled Oats baseline: 1 cup = 81 g.
Common amounts
| Cups | Tablespoons | Grams | Ounces (weight) | Milliliters |
|---|---|---|---|---|
| 1/4 cup | 4.0 | 20 g | 0.71 oz | 59 mL |
| 1/3 cup | 5.3 | 27 g | 0.95 oz | 79 mL |
| 1/2 cup | 8.0 | 41 g | 1.43 oz | 118 mL |
| 2/3 cup | 10.7 | 54 g | 1.91 oz | 158 mL |
| 3/4 cup | 12.0 | 61 g | 2.14 oz | 177 mL |
| 1 cup | 16.0 | 81 g | 2.86 oz | 237 mL |
| 1.5 cups | 24.0 | 122 g | 4.29 oz | 355 mL |
| 2 cups | 32.0 | 162 g | 5.71 oz | 473 mL |
| 3 cups | 48.0 | 243 g | 8.57 oz | 710 mL |
| 4 cups | 64.0 | 324 g | 11.43 oz | 946 mL |
Why measuring rolled oats by cup goes wrong
Old-fashioned rolled oats are oat groats steamed and rolled flat. They weigh 81 grams per cup — light, because the flakes trap air. Quick oats are the same oats rolled thinner; they weigh slightly more per cup and absorb liquid faster. Steel-cut oats are the unrolled groats and weigh about 170 grams per cup.
Practical tips for working with rolled oats
Cookies, granola, oatmeal, and crumbles all want old-fashioned rolled oats — the texture comes from the flakes staying recognizably flake-shaped. Quick oats give you a softer, mushier cookie and a smoother oatmeal that some people prefer. Steel-cut oats are great for breakfast but won't work in a cookie recipe — they'll bake up like uncooked grit.
Note from this ingredient's record: Old-fashioned oats, not instant. Steel-cut oats are denser (about 170 g per cup) and not interchangeable in cookies.
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