20 grams of flax seeds is a small portion that weighs 0.705 oz (20 g). When poured into a loose pile, it measures 2.93 in (7.43 cm) wide and 0.778 in (1.98 cm) tall, which is about the size of a ping-pong ball.

In kitchen measures
1.93 tablespoons
5.8 tsp · 1.93 tbsp · 0.121 cups
about the size of a ping-pong ball
Density estimated by AI from typical values. Flax seeds typically ranges 0.65–0.75 g/mL depending on how it's packed. A firmly packed scoop weighs more.