1 cup of powdered sugar looks like a small, loose pile of white dust. It is about the size of a coffee mug.

In kitchen measures
16 tablespoons
48 tsp · 16 tbsp · 1 cups
about the size of a coffee mug
Powdered sugar typically ranges 0.5–0.62 g/mL depending on how it's packed. A firmly packed scoop weighs more.