30 grams of casein protein powder is a standard serving size that measures 1.06 oz (30 g). When poured into a loose pile, it is about the size of a large egg, measuring 3.22 in (8.17 cm) wide and 1.35 in (3.43 cm) tall.

In kitchen measures
4.06 tablespoons
12.2 tsp · 4.06 tbsp · 0.254 cups
about the size of a large egg
Casein protein powder typically ranges 0.42–0.58 g/mL depending on how it's packed. A firmly packed scoop weighs more.