4 grams of matcha powder is 0.141 oz (4 g). When poured into a loose pile, it is 1.81 in (4.59 cm) wide and 0.814 in (2.07 cm) tall, which is about the size of a grape.

In kitchen measures
2.32 teaspoons
2.32 tsp · 0.773 tbsp · 0.048 cups
about the size of a grape
Matcha powder typically ranges 0.3–0.42 g/mL depending on how it's packed. A firmly packed scoop weighs more.