Grams of Oats to Cups
One US cup of rolled oats weighs 89 grams. To convert grams of rolled oats to cups, divide the grams by 89 — so 100 g is 1 ⅛ cups and 89 g is exactly 1 cup.
250 g Rolled oats (old-fashioned) = 2 ¾ cups
Exactly 2.81 cups — or measure 2 cups + 13 tbsp.
Oats cups-to-grams chart
| 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 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.
Grams of oats to cups — every amount
- 50 g to cups — ½ cup
- 100 g to cups — 1 ⅛ cups
- 125 g to cups — 1 ⅜ cups
- 150 g to cups — 1 ⅔ cups
- 200 g to cups — 2 ¼ cups
- 250 g to cups — 2 ¾ cups
- 300 g to cups — 3 ⅜ cups
- 400 g to cups — 4 ½ cups
- 500 g to cups — 5 ⅝ cups
Other ingredients
- Grams of flour to cups
- Grams of sugar to cups
- Grams of powdered sugar to cups
- Grams of brown sugar to cups
- Grams of honey to cups
- Grams of butter to cups
- Grams of milk to cups
- Grams of rice to cups
- Grams of chocolate chips to cups
- Grams of cocoa powder to cups
- Grams of water 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.