Are you a caffeine addict? Do you drink coffee for the jolt it offers? Well, it's time to see how your favorite coffee-carrying chain clocks in!
Buzzfeed News lab tested coffee from four national chains: Starbucks, McDonald's, 7-Eleven, and Dunkin' Donuts, to determine which packs the most caffeine.
They found 7-Eleven coffee had the highest average caffeine level, with an average of 280 milligrams of caffeine in every cup.
Starbucks came in second with an average of 267 milligrams, McDonald's McCafe had 227 milligrams and Dunkin' Donuts came in last with 220 milligrams per cup.
The variability in caffeine concentrations may be a result of companies choosing to offer regional coffees. For example, 7-Eleven tells Buzzfeed News they see that customers in different areas are looking for different products.
"Statistically, they're all kind of overlapping. If you go to any one of these single chains and grab a medium cup of coffee you can expect around 250 milligrams of caffeine," says a representative from Labdoor, the agency responsible for the study.