1/3 Cup of Oats in Grams
1/3 cup of rolled oats weighs 30 grams (about 1.1 oz), based on 89 g per US cup (level cup). That's the same as 5.3 tablespoons of rolled oats. When a recipe's outcome depends on accuracy — especially baking — weigh it instead of measuring by cup.
1/3 cup is the awkward fraction: it does not divide into whole tablespoons, and halving it lands on 2 tablespoons + 2 teaspoons. Two scoops make 2/3 cup (59 g), three make a full cup (89 g).
How much is 1/3 cup of rolled oats?
| Grams | 30 g |
|---|---|
| Ounces (weight) | 1.1 oz |
| Tablespoons | 5.3 tbsp |
| Teaspoons | 16 tsp |
| Density used | 89 g per US cup |
No 1/3 cup measure? Use spoons
1/3 cup is exactly 5 tablespoons + 1 teaspoon, which is 30 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 1/3 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 | ⅛ cup | 15 g | 2 tablespoons + 2 teaspoons |
| As written | ⅓ cup | 30 g | 5 tablespoons + 1 teaspoon |
| Double | ⅔ cup | 59 g | 10 tablespoons + 2 teaspoons |
Nearby amounts
| 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 |
Every cup fraction of oats in grams — the full chart.
How to measure 1/3 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.
1/3 cup of other ingredients
- 1/3 cup all-purpose flour in grams — 40 g
- 1/3 cup granulated sugar in grams — 67 g
- 1/3 cup powdered sugar in grams — 40 g
- 1/3 cup brown sugar (packed) in grams — 71 g
- 1/3 cup honey in grams — 113 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.