But here’s what you should know before you glug down too many.

Coffee

Learn the secret to getting the most caffeine at Starbucks.

Starbucks has six primary cup sizes customers can choose from: Demi, Short, Tall, Grande, Venti, and Trenta. However, whether you order your beverage hot or "iced" can affect the caffeine content in your drink, and even the actual volume of your cup. Caffeine content can also vary depending on the style of beverage you order.