The medium size at Starbucks is called "Grande," which is equivalent to 16 ounces. It is the most commonly ordered cup size and is considered the standard size for many popular beverages at the coffee chain. The Grande size is suitable for a variety of drinks, including classic options like lattes, cappuccinos, and mochas, as well as specialty drinks like the Starbucks Doubleshot on Ice and the Starbucks Refreshers.