35 grams of rolled oats is a standard serving size that measures 1.23 oz (35 g). It fills a volume of 5.92 tbsp (87.5 mL) and is about the size of a large egg.

In kitchen measures
5.92 tablespoons
17.8 tsp · 5.92 tbsp · 0.37 cups
about the size of a large egg
Rolled oats typically ranges 0.38–0.48 g/mL depending on how it's packed. A firmly packed scoop weighs more.