How Many Grams in a Cup of Rolled Oats?
1 cup rolled oats = 89 g3.1 oz · loosely filled · ½ cup = 45 g · 1 tbsp = 5.6 g
Reference values Being verified with kitchen scale tests. Current figures follow the King Arthur Baking ingredient weight chart.
On this page: Chart, ⅛ to 4 cups · Grams to cups · Measuring tips
Rolled Oats cups to grams
89 g
1 cup rolled oats (old-fashioned) (loosely filled) ≈ 3.1 oz
Reference values Being verified with kitchen scale tests. Current figures follow the King Arthur Baking ingredient weight chart.
Why rolled oats has its own cups-to-grams number
Rolled (old-fashioned) oats are light and full of air gaps, so a cup weighs less than a cup of flour. The reference value is for loosely filled rolled oats. Quick oats are cut smaller and settle more tightly, and steel-cut oats are denser still, so don’t reuse this number for them.
Rolled Oats cups to grams chart
US cups and spoons, loosely filled. Grams are rounded to the nearest gram (0.1 g under 10 g).
| US measure | Grams | Ounces |
|---|---|---|
| 1 teaspoon | 1.9 g | 0.07 oz |
| 1 tablespoon | 5.6 g | 0.2 oz |
| ⅛ cup (2 tbsp) | 11 g | 0.39 oz |
| ¼ cup | 22 g | 0.78 oz |
| ⅓ cup | 30 g | 1.05 oz |
| ½ cup | 45 g | 1.57 oz |
| ⅔ cup | 59 g | 2.09 oz |
| ¾ cup | 67 g | 2.35 oz |
| 1 cup | 89 g | 3.14 oz |
| 1½ cups | 134 g | 4.71 oz |
| 2 cups | 178 g | 6.28 oz |
| 3 cups | 267 g | 9.42 oz |
| 4 cups | 356 g | 12.6 oz |
| Grams | US measures | Decimal cups |
|---|---|---|
| 50 g | ≈ ½ cup + 1 tbsp | 0.56 cups |
| 100 g | ≈ 1 cup + 1 tbsp + 2¾ tsp + ⅛ tsp | 1.12 cups |
| 250 g | ≈ 2¾ cups + 2¾ tsp + ⅛ tsp | 2.81 cups |
| 500 g | ≈ 5⅔ cups | 5.62 cups |
“≈” means the amount is rounded to the nearest ⅛ teaspoon you can measure.
How to measure rolled oats for this conversion
- Pour or spoon the oats into a dry measuring cup and level it without pressing.
- Shake the cup gently only if the recipe tells you to; settling adds weight.
- For granola or overnight oats, small differences rarely matter. For oat cookies and bars, grams give more repeatable texture.
- Check the label: “old-fashioned” and “rolled” oats are the same thing; “quick” and “instant” are not.
Source: King Arthur Baking Ingredient Weight Chart (reference value, not yet scale-tested by Measure Pantry).