Convert Cups to Grams: Rolled Oats
Convert cups of rolled oats to grams with this complete reference table. 1 cup of rolled oats = 90g (USDA FoodData Central, spooned-and-leveled method). Use the table below for fractions from 1/8 cup up to 4 cups. For precision baking, weight measurements in grams are always more reliable than volume measurements in cups, because rolled oats density can vary by measuring technique.
Rolled Oats Cups to Grams Table
| Cups | Grams |
|---|---|
| 1/8 cup | 11.3g |
| 1/4 cup | 22.5g |
| 1/3 cup | 30g |
| 1/2 cup | 45g |
| 2/3 cup | 60g |
| 3/4 cup | 67.5g |
| 1 cup | 90g |
| 1 1/4 cups | 112.5g |
| 1 1/2 cups | 135g |
| 2 cups | 180g |
| 3 cups | 270g |
| 4 cups | 360g |
Based on USDA FoodData Central data (1 US cup = 240ml = 16 tablespoons = 48 teaspoons). Note: Rolled oats (old-fashioned oats) are flat and large. 1 cup = 90g. Quick oats are cut smaller — same weight per cup. Steel-cut oats are different: 1 cup = 160g (denser, unrolled). Used for granola, cookies, overnight oats.
About Rolled Oats Density
The density of rolled oats determines how much it weighs per unit of volume. At 0.375g/ml, 1 US cup (240ml) of rolled oats weighs 90g under USDA standard conditions.
Volume measurements can vary by ±10–20% depending on technique (sifted vs. spooned vs. scooped). For consistent baking results, use a kitchen scale with gram measurements whenever possible. The USDA standard (spooned-and-leveled) is the reference point for all values on this page.
Frequently Asked Questions
How many grams is 1 cup of rolled oats?
1 cup of rolled oats weighs 90 grams (USDA FoodData Central, spooned-and-leveled method, 1 US cup = 240ml).
How many grams is 1/2 cup of rolled oats?
1/2 cup of rolled oats weighs 45 grams.
How many grams is 1/4 cup of rolled oats?
1/4 cup of rolled oats weighs 23 grams.
Does measuring technique affect the weight of rolled oats?
Yes. Sifted rolled oats can weigh up to 20% less than packed or scooped. The USDA standard (spooned-and-leveled) of 90g/cup is the most reliable baseline.