The following chart shows the approximate amount of caffeine in different sizes of brewed coffee drinks from Starbucks and Dunkin Donuts, two popular coffee shop chains. The exact amount will vary ...
Starbucks serves 75 milligrams of caffeine in each of its .75-ounce espresso shots. Dunkin Donuts claims a hefty 118 milligrams per shot. In comparison, drip coffee ranges from around 12 to 16 ...