Caffeine in Coffee Calculator Caffeine in Coffee Coffee Needed for Caffeine How much Caffeine in Coffee? fl oz (~ 29.6g) Cup (~237g) ml Gram Calculate Amount of Caffeine How Much Coffee Are Needed for a Specific Amount of Caffeine? mg Calculate Amount of Coffee The main purpose of this converter is to convert from caffeine to coffee and back. Calculate how much caffeine are there in a specific amount of coffee. Leave a Comment Cancel replyCommentName Email Save my name, email, and website in this browser for the next time I comment.