You probably know this by now, but not all coffee is created equal. When you order a cup of coffee from a chain, the odds of it having the same amount of caffeine as the coffee from its competitors are slim to none. This is because each chain uses different beans, roasted for different lengths of time, served in containers of various sizes, and all of those things have an effect on caffeine content.
Thankfully, caffeine content is consistent from cup to cup at each individual chain, so we know how much caffeine is in a cup of coffee from each of them. Just as a frame of reference, the Mayo Clinic suggests no more than 400 milligrams of caffeine daily; a can of Diet Coke contains 42 milligrams of caffeine, a 12-ounce Red Bull contains 111 milligrams, a standard K-cup contains 120 milligrams, and a 5-hour Energy shot contains 200 milligrams.
Caribou Coffee, 12-ounce coffee: 230 milligrams
Chick-fil-A, 14-ounce coffee: 94 milligrams
Coffee Bean & Tea Leaf, medium coffee (16 ounces): 333 milligrams
Dunkin’ Donuts, medium coffee (12 ounces): 210 milligrams
McDonald’s, medium coffee (16 ounces): 145 milligrams
Peet’s, 16-ounce coffee: 267 milligrams
Seattle’s Best, 12-ounce coffee: 260 milligrams
Starbucks, Grande coffee (16 ounces): 330 milligrams
Tim Horton’s, medium coffee (14 ounces): 205 milligrams