A standard 12-ounce (355 ml) can of Coca-Cola contains approximately 32 to 34 mg of caffeine
. Diet Coke contains slightly more caffeine, about 42 to 46 mg per 12-ounce can
. The caffeine content in Coke is significantly lower than that in coffee or many energy drinks. For example, an 8-ounce cup of coffee typically contains around 95 mg of caffeine, nearly three times as much as a 12-ounce Coke
