How much caffeine is in your cup

An average eight-ounce mug of drip coffee contains roughly 95 milligrams of caffeine. If you pull a standard double shot of espresso, you are looking at about 120 milligrams, despite the smaller volume. Factors like bean variety — specifically Arabica versus Robusta, which has nearly double the caffeine content — and your precise steeping duration will ultimately shift these baseline measurements.