50 grams of butter is 1.76 oz (50 g). It is about the size of a large egg.

In kitchen measures
3.72 tablespoons
11.1 tsp · 3.72 tbsp · 0.232 cups
about the size of a large egg
Butter typically ranges 0.9–0.92 g/mL depending on how it's packed. A firmly packed scoop weighs more.