100 grams of canned tuna is a standard serving size that weighs 3.53 oz (100 g). When poured into a loose pile, it is about the size of a tennis ball.

In kitchen measures
8.45 tablespoons
25.4 tsp · 8.45 tbsp · 0.528 cups
about the size of a tennis ball
Density estimated by AI from typical values. Canned tuna typically ranges 0.7–0.9 g/mL depending on how it's packed. A firmly packed scoop weighs more.