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.
One US cup is the reference every other fraction on this page derives from: 89 g of rolled oats (level cup). Halve it for 45 g, double it for 178 g.
How much is 1 cup of rolled oats?
| Grams | 89 g |
|---|---|
| Ounces (weight) | 3.1 oz |
| Tablespoons | 16 tbsp |
| Teaspoons | 48 tsp |
| Density used | 89 g per US cup |
No 1 cup measure? Use spoons
1 cup is exactly 16 tablespoons, which is 89 g of rolled oats. Measuring spoons are stamped to a tighter tolerance than cups, so for small amounts the spoon route is usually the more accurate one even when you do own the cup.
Halving and doubling 1 cup
Scaling a recipe is the usual reason this conversion comes up, and grams scale cleanly where cup fractions do not:
| Recipe | Cups | Grams | Spoons |
|---|---|---|---|
| Half | ½ cup | 45 g | 8 tablespoons |
| As written | 1 cup | 89 g | 16 tablespoons |
| Double | 2 cups | 178 g | 32 tablespoons |
Nearby amounts
| Cups | Grams | Ounces |
|---|---|---|
| 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 |
Every cup fraction of oats in grams — the full chart.
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.