Decaf

Decaf coffee is a popular alternative for those looking to cut their caffeine intake. However, it is not completely caffeine-free. While the decaffeination process removes at least 97% of caffeine, virtually all decaf coffees still contain around 7 mg per 8-ounce (236-ml) cup. For some people, it is enough to increase energy levels. As for decaf, the average 8oz cup contains 7mg of caffeine, with a range of 3mg to 15.8 mg.