McDonald's coffee contains an impressive 9.06 mg of caffeine per fluid ounce, or 30.64 mg per 100 ml. A 16 fl oz cup contains a total of 145 mg of caffeine, although the exact amount may vary depending on the store and the brewing process. Although Starbucks may be the most popular coffee chain, laboratory tests have revealed that McDonald's coffee contains more caffeine per cup. The fast-food giant does not list or evaluate the caffeine content of its coffee, but uses the average caffeine content published by the USDA for the standard amount of ground coffee used per 8 oz of water.
The caffeine content of a Grande Coffee Frappuccino from Starbucks is reported to be 90 mg, which is approximately comparable to McDonald's beverages. However, McDonald's does not publish the caffeine content of its drinks, as “the FDA does not require caffeine levels to be published”. Labdoor researchers analyzed the caffeine content of a medium cup of coffee brewed from Starbucks, 7-Eleven, McDonald's and Dunkin' Donuts from stores in New York and San Francisco. The results showed that McDonald's coffee had higher levels of caffeine than its competitors.
McCafe is the branch of McDonald's responsible for preparing and supplying coffee and other hot beverages to its customers. The exact amount of caffeine in each cup can vary depending on how it is brewed, including the number of coffee spoons used. If you're sensitive to caffeine, it's important to know how much you're drinking and to moderate your intake accordingly.