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Cooking conversion
Cups of Rolled Oats to Ounces
How many ounces are in cups of rolled oats? Type a value below to see the result instantly. Cooking conversions depend on the density of each ingredient — the math here uses 0.385 g/mL for rolled oats.
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1 cup of rolled oats = 3.213 oz
Cups of Rolled Oats to Ounces Conversion Table
Common values for rolled oats:
| Cups of rolled oats | Ounces |
|---|---|
| 0.25 cup | 0.803244 oz |
| 0.5 cup | 1.6065 oz |
| 1 cup | 3.213 oz |
| 2 cup | 6.426 oz |
| 3 cup | 9.6389 oz |
| 4 cup | 12.8519 oz |
| 5 cup | 16.0649 oz |
| 8 cup | 25.7038 oz |
| 10 cup | 32.1298 oz |
How this works
Rolled oats has a density of about 0.385 g/mL (king arthur baking: 1 cup = 91g). That means 1 mL of rolled oats weighs 0.385 grams.
Ounces = cups × 3.2130
Note: Old-fashioned rolled oats. Quick oats are slightly denser (~0.41).
Why a cup of rolled oats doesn't always weigh the same
Volume measurements are forgiving in some ways and brutal in others. A cup of rolled oats can vary by 10-20% in weight depending on how it's measured: spooned vs scooped, packed vs loose, sifted vs unsifted. The density figure used here matches the most common published recipe conventions, but if you're after baking precision, weighing on a kitchen scale is more accurate than measuring by volume.