1 cup of all-purpose flour in grams

One level US cup (240 ml) of all-purpose flour weighs about 120 grams. That makes ½ cup ≈ 60 g, ⅓ cup ≈ 40 g and ¼ cup ≈ 30 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.