2 tablespoons of peanut butter weighs 1.16 oz (32.8 g). It 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
Peanut butter typically ranges 1.08–1.14 g/mL depending on how it's packed. A firmly packed scoop weighs more.