4 fluid ounces of champagne is a standard serving size that fills a glass 2.05 in (5.21 cm) wide. You can picture this amount as being about the size of a tennis ball.

In kitchen measures
8 tablespoons
24 tsp · 8 tbsp · 0.5 cups
about the size of a tennis ball
Density estimated by AI from typical values. Champagne typically ranges 0.99–1.01 g/mL depending on how it's packed. A firmly packed scoop weighs more.