Death Wish Coffee is only slightly stronger ounce for ounce than espresso. The Death Wish Coffee company reports that their dark Roast and medium roast blends contain approximately 300 milligrams of caffeine. However, The New York Times reports third-party testing revealing a range of 650 to 728 milligrams of caffeine per 12-ounce mug which is the average size found at most popular coffee outlets, while Consumer Reports reports an 8-ounce cup at 472 milligrams of caffeine. A double shot of espresso carrying three fluid ounces has about 150 to 212 milligrams of caffeine, and 150 if ordered from Starbucks. That means that even at its strongest estimates, Death Wish Coffee only has around 30 milligrams of caffeine, more than the average espresso.