5 grams of creatine monohydrate is a standard serving size for supplementation. It is about the size of a cherry when poured into a loose pile.

In kitchen measures
1.69 teaspoons
1.69 tsp · 0.564 tbsp · 0.035 cups
about the size of a cherry
Creatine monohydrate typically ranges 0.55–0.7 g/mL depending on how it's packed. A firmly packed scoop weighs more.