Rolled Oats: Cups to Grams
Quick answer: One US cup of rolled oats weighs about 90 grams (3.2 oz), and one tablespoon about 6 g.
US recipes measure rolled oats in cups; the rest of the world weighs it. Convert any amount in either direction — and measure it the way the chart assumes: rolled and quick oats weigh about the same; steel-cut is nearly double, so don't swap by cup.
Rolled Oats conversion chart
| Cups | Grams | Ounces |
|---|
| ¼ cup | 23 g | 0.8 oz |
| ⅓ cup | 30 g | 1.1 oz |
| ½ cup | 45 g | 1.6 oz |
| ⅔ cup | 60 g | 2.1 oz |
| ¾ cup | 68 g | 2.4 oz |
| 1 cup | 90 g | 3.2 oz |
| 1½ cups | 135 g | 4.8 oz |
| 2 cups | 180 g | 6.3 oz |
How it works
Cups measure volume and grams measure weight, so the conversion runs through density: rolled oats packs about 90 g into a US cup (237 ml). Volume is only as accurate as your technique — rolled and quick oats weigh about the same; steel-cut is nearly double, so don't swap by cup. That variability is exactly why serious baking recipes list grams, and why a $15 kitchen scale upgrades every bake. If your recipe uses metric cups (250 ml), the weights run about 5% higher.
Frequently asked
How many grams are in a cup of rolled oats?
About 90 grams (3.2 oz) per US cup, measured properly. A tablespoon is about 6 g.
How many cups is 250 g of rolled oats?
About 2.78 cups. Divide any gram amount by 90 to get cups — or flip the converter above to grams and it does it for you.
Can I swap rolled, quick and steel-cut oats?
Rolled and quick swap by cup (~90 g) with a texture change. Steel-cut is ~176 g per cup and cooks completely differently — never a volume swap.
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