0.333 cups of steel-cut oats is a volume of 5.33 tbsp (78.8 mL) with a weight of 2.08 oz (59.1 g). You can picture this amount as being about the size of a large egg.

In kitchen measures
5.33 tablespoons
16 tsp · 5.33 tbsp · 0.333 cups
about the size of a large egg
Density estimated by AI from typical values. Steel-cut oats typically ranges 0.7–0.82 g/mL depending on how it's packed. A firmly packed scoop weighs more.