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