1 cup of rolled oats in grams

One level US cup (240 ml) of rolled oats weighs about 90 grams. That makes ½ cup ≈ 45 g, ⅓ cup ≈ 30 g and ¼ cup ≈ 22 g. These are scoop-and-level averages — packing the cup can add up to 20%, which is why bakers swear by a scale. More ingredients in the full cups-to-grams converter.