A 12-ounce (355 ml) can of Coca-Cola contains about 33 to 34 mg of caffeine
. Diet Coke has a higher caffeine content, with about 42 to 46 mg per 12-ounce serving
. This caffeine amount in Coke is significantly lower than in coffee, which typically has around 95 to 140 mg per 12-ounce cup
