There are two types of coffee beans: arabica and robusta. Robusta coffees have more caffeine between the two varieties. We only roast arabica coffees which can range from 80-200mg (avg. 110mg) per cup. Coffee experiences a decrease in caffeine as the roast increases, therefore 1 espresso shot has less caffeine than an 8oz. cup of coffee. This is due to a loss of caffeine in the roasting process.