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Rolled Oats: Cups to Grams
1 cup of rolled oats = 89 g (3.14 oz)
Converter
Fractions OK: try “3/4” or “1 1/2”.
Conversion chart
| Volume | Grams | Ounces |
|---|---|---|
| 1/8 cup | 11.1 g | 0.39 oz |
| 1/4 cup | 22.2 g | 0.78 oz |
| 1/3 cup | 29.7 g | 1.05 oz |
| 1/2 cup | 44.5 g | 1.57 oz |
| 2/3 cup | 59.3 g | 2.09 oz |
| 3/4 cup | 66.8 g | 2.35 oz |
| 1 cup | 89 g | 3.14 oz |
| 1 1/2 cup | 133.5 g | 4.71 oz |
| 2 cup | 178 g | 6.28 oz |
| 3 cup | 267 g | 9.42 oz |
| 1 tbsp | 5.6 g | 0.20 oz |
| 2 tbsp | 11.1 g | 0.39 oz |
| 3 tbsp | 16.7 g | 0.59 oz |
| 4 tbsp | 22.2 g | 0.78 oz |
| 6 tbsp | 33.4 g | 1.18 oz |
| 8 tbsp | 44.5 g | 1.57 oz |
| 1 tsp | 1.9 g | 0.07 oz |
| 2 tsp | 3.7 g | 0.13 oz |
King Arthur gives the same weight, 89 g per cup, for old-fashioned (rolled) and quick-cooking oats. Oats are light and airy, so a cup weighs far less than a cup of flour, and how loosely you scoop can swing the volume a lot. Weighing removes that guesswork. Cooked (prepared) oats are much heavier, about 147 g per cup on the same chart, so don't use this number for oatmeal that's already been made.
FAQ
How many grams are in 1 cup of rolled oats?
1 US cup of rolled oats weighs 89 grams (3.14 oz), according to the King Arthur Baking ingredient weight chart.
How many grams are in a tablespoon of rolled oats?
About 5.6 grams. There are 16 tablespoons in a US cup, so 89 g ÷ 16 = 5.6 g per tablespoon (and about 1.9 g per teaspoon).
How many cups is 100 grams of rolled oats?
100 g of rolled oats is about 1.12 cups (18.0 tablespoons), based on 89 g per cup.
Source: King Arthur Baking — Ingredient Weight Chart. Chart entry: “Oats (old-fashioned or quick-cooking) — 1 cup = 3 1/8 oz / 89 g”. Other amounts are calculated from 89 g per cup.