50 grams of whey protein powder is a common serving size for supplements. It occupies 7.51 tbsp (111 mL) of volume and sits about the size of a tennis ball when poured into a loose pile.

In kitchen measures
7.51 tablespoons
22.5 tsp · 7.51 tbsp · 0.47 cups
about the size of a tennis ball
Whey protein powder typically ranges 0.38–0.55 g/mL depending on how it's packed. A firmly packed scoop weighs more.