2 tablespoons of ground coffee is a standard serving that weighs 0.417 oz (11.8 g). When poured into a loose pile, it is 2.48 in (6.31 cm) wide and 1.12 in (2.84 cm) tall, which is about the size of a ping-pong ball.

In kitchen measures
2 tablespoons
6 tsp · 2 tbsp · 0.125 cups
about the size of a ping-pong ball
Ground coffee typically ranges 0.35–0.48 g/mL depending on how it's packed. A firmly packed scoop weighs more.