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In addition, critics point to the fact that these drinks are popular with children and young adults: groups discouraged from drinking high caffeine energy drinks and beverages. Is Dunkin Donuts coffee better than Starbucks? Coke and Pepsi have been heavily criticized for the levels of caffeine and sugar levels of their drinks. Starbucks came in second with an average of milligrams, McDonald's McCafe had milligrams, and Dunkin' Donuts came in last with milligrams per cup. Is Dunkin or Starbucks stronger? Who is the king of caffeine? The testing, done by Labdoor, showed an average of milligrams of caffeine in every 7-Eleven cup. That equals about 12mg per ounce of coffee, compared with the 64mg in an ounce of espresso. In turn, that means some cups of coffee or shots of espresso have more caffeine than others.
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The variety and quality of the beansthe type of roast, and the grind each has a big impact on how much caffeine coffee contains. Having a doppio instead of a single shot? That double shot will contain about one-third more caffeine than a cup of coffee. The average one-ounce shot of espresso contains 64 milligrams. The average eight-ounce cup of brewed coffee contains 96 milligrams of caffeine.
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The caffeine content is different simply because the brew you get from your Nespresso or espresso machine is really nothing more than highly-concentrated coffee. In that case, the amount of caffeine that makes it to your cup has nothing to do with beans. Robusta beans have about twice the caffeine content as Arabica beans, so espresso made with robusta is likely to contain more caffeine than espresso made from Arabica.