Which Coffee Has Most Caffeine?

Which Coffee Has Most Caffeine?

Normal coffee is of 40 mgs of caffeine per 8 oz cup. Espresso contains 100mg of caffeine per 8 oz cup. Tea contain more caffeine than coffee. The secret here is that different kinds of teas have more caffeine than the other. Black tea has least caffeine of all teas, more than green and white teas. A cup of black tea has 37 ml of caffeine in it while a cup of green tea has around 25 ml in it. White tea has the least in it, with only 17 ml of caffeine per cup..