A 60 g serving of whey protein powder is noticeably larger than a 30 g serving. You can visualize the 30 g portion as a pile 3.33 in (8.47 cm) wide and 1.4 in (3.55 cm) tall, while the 60 g portion forms a pile 4.2 in (10.7 cm) wide and 1.76 in (4.48 cm) tall.

Biggest vs smallest
1.26× the size
60 g of whey protein powder vs 30 g of whey protein powder
Typical adult or standard sizes; real ones vary.