30 grams of whey protein powder is a standard serving size for many supplements. It is about the size of a large egg when poured into a loose pile.

In kitchen measures
4.51 tablespoons
13.5 tsp · 4.51 tbsp · 0.282 cups
about the size of a large egg
Whey protein powder typically ranges 0.38–0.55 g/mL depending on how it's packed. A firmly packed scoop weighs more.