Caffeine content measured in several different brands of chai tea lattes found a range from 25 milligrams to 120 milligrams per 8 fluid ounces. The caffeine content varies widely because of differences between brands, types of tea used and the amount of milk used to dilute the drink.
Chai tea lattes are typically brewed with black tea, which contains an average caffeine content of 42 milligrams per 8 fluid ounces. An average chai tea latte contains slightly less as it is diluted with a large amount of milk. Chai tea lattes are made with black or green teas and traditional Indian spices such as cardamom, cinnamon and black pepper.