400 Grams of Oats to Cups
400 grams of rolled oats equals 4 ½ cups (4.49 US cups), based on 89 g per cup (level cup). In the kitchen, measure 4 cups + 8 tbsp. For best results, weigh rolled oats with a scale — cup measurements vary with how the cup is filled.
| US cups | 4 ½ cups (4.49 cups) |
|---|---|
| Measured as | 4 cups + 8 tbsp |
| Ounces (weight) | 14.1 oz |
| Density used | 89 g per US cup |
How to measure 400 g of rolled oats without a scale
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.
Nearby amounts
| Grams | Cups | Decimal |
|---|---|---|
| 250 g | 2 ¾ cups | 2.81 |
| 300 g | 3 ⅜ cups | 3.37 |
| 500 g | 5 ⅝ cups | 5.62 |
400 grams of other ingredients
The same weight fills a very different cup depending on density — that's why "grams to cups" always needs the ingredient:
- 400 g of all-purpose flour to cups — 3 ⅓ cups
- 400 g of granulated sugar to cups — 2 cups
- 400 g of powdered sugar to cups — 3 ⅓ cups
- 400 g of brown sugar (packed) to cups — 1 ⅞ cups
- 400 g of honey to cups — 1 ⅛ cups
Convert another amount
250 g Rolled oats (old-fashioned) = 2 ¾ cups
Exactly 2.81 cups — or measure 2 cups + 13 tbsp.
More oats conversions: the full grams-to-cups oats chart
Density 89 g/cup — sources: King Arthur Baking ingredient weight chart, Quaker nutrition label, USDA FoodData Central. Data verified 2026-08-20. Methodology.