30 grams of walnuts is a portion that weighs 1.06 oz (30 g) and has a volume of 4.51 tbsp (66.7 mL). In plain language, this amount is about the size of a large egg.

In kitchen measures
4.51 tablespoons
13.5 tsp · 4.51 tbsp · 0.282 cups
about the size of a large egg
Density estimated by AI from typical values. Walnuts typically ranges 0.38–0.52 g/mL depending on how it's packed. A firmly packed scoop weighs more.