amount of caffeine in coke
*Additional note* I have also checked how much caffeine regular Coca-Cola contains since I am seeing a lot of comments by people who haven`t tried Coke Zero or Diet Coke yet. :). Coke Zero contains 58mg of caffeine per 20 fl. oz.Diet Coke contains 76mg of caffeine per 20 fl. oz. Coca-Cola contains 58mg of caffeine per 20 fl. oz.A surprising 18 mg difference between Coca-Cola, Coke Zero and Diet Coke! That may not seem like much, but it is something soda drinkers may want to keep in mind if they are also trying to monitor their caffeine intake.Additional note* I have also checked how much caffeine regular Coca-Cola contains since I am seeing a lot of comments by people who haven`t tried Coke Zero or Diet Coke yet. :). Coke Zero contains 58mg of caffeine per 20 fl. oz.