1 tablespoon of ground coffee is a common measurement for brewing. It is about the size of a grape and forms a loose pile 1.97 in (5.01 cm) wide and 0.887 in (2.25 cm) tall.

In kitchen measures
3 teaspoons
3 tsp · 1 tbsp · 0.063 cups
about the size of a grape
Ground coffee typically ranges 0.35–0.48 g/mL depending on how it's packed. A firmly packed scoop weighs more.