What is the size of the milk required for a grande iced classic chai tea latte?

For a grande iced classic chai tea latte, the milk portion is filled to the top line of the cup. This is standard protocol for iced beverages at Starbucks, where the milk makes up a substantial part of the drink alongside the chai concentrate and ice.

When preparing this beverage, the practice is to fill the cup with ice first and then pour the chai concentrate and milk over it. The milk layer serves to balance the spiced flavor of the chai and contribute to the overall creamy texture of the drink. By filling the milk to the top line, the drink maintains the intended taste and consistency that customers expect from a grande iced chai tea latte. This ensures proper dilution and a well-rounded flavor profile, providing an enjoyable experience for the drinker.