One tablespoon of psyllium husk powder is 0.156 oz (4.44 g) in weight and 1 tbsp (14.8 mL) in volume. When poured into a loose pile, it measures 1.9 in (4.83 cm) wide and 0.952 in (2.42 cm) tall, which is about the size of a grape.

In kitchen measures
3 teaspoons
3 tsp · 1 tbsp · 0.063 cups
about the size of a grape
Psyllium husk powder typically ranges 0.25–0.4 g/mL depending on how it's packed. A firmly packed scoop weighs more.