30 grams of oat flour looks like a loose pile that is 3.38 in (8.6 cm) wide and 1.42 in (3.61 cm) tall. It is about the size of a large egg.

In kitchen measures
4.72 tablespoons
14.2 tsp · 4.72 tbsp · 0.295 cups
about the size of a large egg
Density estimated by AI from typical values. Oat flour typically ranges 0.38–0.5 g/mL depending on how it's packed. A firmly packed scoop weighs more.