Keep in mind that the actual caffeine content of a cup of coffee or tea can vary considerably because of factors such as origin, processing and preparation method, including brewing time. So use these numbers as a guide..This guide outlines how much caffeine is in each of these drinks, including decaf coffee and tea, sodas, popular energy drinks, bottled iced teas, Starbucks coffees, herbal teas or tisanes , and more..The amount of caffeine in a cup of coffee depends on the type of coffee you’re drinking and the size of the cup you’re using. For example, a cup of brewed caffeinated coffee can have anywhere between around mg ounces, or a small coffee mug and mg of caffeine for a ounce cup of lightly roasted beans ..For a oz cup size this is quite weak and has considerably less caffeine than a brewed coffee of the same size. Most conscientious coffee vendors serve at least a double sin drinks over ounces..
According to one source, a small cup oz has mg of caffeine, and a large cup oz contains mg . That’s almost as much caffeine as you find in other varieties of regular coffee..The average ounce cup of decaf coffee a Starbucks tall usually contains between milligrams of caffeine. By comparison, an . ounce can of Red Bull contains milligrams of caffeine The average of amount of caffeine in regular coffee can .