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Rolled Oats (old-fashioned): cups to grams

1 cup of rolled oats (old-fashioned) weighs about 89 grams.

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CupsGrams
1/4 cups22 g
1/3 cups30 g
1/2 cups44 g
2/3 cups59 g
3/4 cups67 g
1 cup89 g
1 1/2 cups134 g
2 cups178 g
3 cups267 g

Density: ~89 g per cup · source: King Arthur Baking. Weighing is more accurate than measuring by volume.

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Questions

How many grams is 1 cup of Rolled Oats (old-fashioned)?

1 cup of rolled oats (old-fashioned) is about 89 grams (source: King Arthur Baking).

Why isn't 1 cup of Rolled Oats (old-fashioned) 240 grams?

240 g is the weight of a cup of water. Rolled Oats (old-fashioned) has a different density (~89 g per cup), so weighing on a kitchen scale is more accurate than measuring by volume.

How many ounces is 1 cup of Rolled Oats (old-fashioned)?

About 3.1 oz (1 cup ≈ 89 g ≈ 3.1 oz).