1 Cup of Oats in Grams
1 cup of rolled oats weighs 89 grams (about 3.1 oz), based on 89 g per US cup (level cup). That's the same as 16 tablespoons of rolled oats. When a recipe's outcome depends on accuracy — especially baking — weigh it instead of measuring by cup.
Oats — all cup fractions in grams
| Cups | Grams | Ounces |
|---|---|---|
| ¼ cups | 22 g | 0.8 oz |
| ⅓ cups | 30 g | 1.1 oz |
| ½ cups | 45 g | 1.6 oz |
| ⅔ cups | 59 g | 2.1 oz |
| ¾ cups | 67 g | 2.4 oz |
| 1 cup | 89 g | 3.1 oz |
| 1½ cups | 134 g | 4.7 oz |
| 2 cups | 178 g | 6.3 oz |
How to measure 1 cup of rolled oats
Rolled oats are light and irregular — a level cup is only about 89 g. Scoop-and-level is fine; the flakes don’t compact much. Quick oats weigh nearly the same, but steel-cut oats are much denser and don’t substitute by volume.
1 cup of other ingredients
- 1 cup all-purpose flour in grams — 120 g
- 1 cup granulated sugar in grams — 200 g
- 1 cup powdered sugar in grams — 120 g
- 1 cup brown sugar (packed) in grams — 213 g
- 1 cup honey in grams — 340 g
Convert another amount
250 cups Rolled oats (old-fashioned) = 22250 g
Based on 89 g per US cup.
Reverse conversion: grams of oats to cups.
Density 89 g/cup — sources: King Arthur Baking ingredient weight chart, Quaker nutrition label, USDA FoodData Central. Data verified 2026-08-20. Methodology.