Question: how much caffeine in starbucks decaf sumatra?
Answer: The average 12-ounce cup of decaf coffee – a Starbucks tall – usually contains between 3 and 18 milligrams of caffeine. (By comparison, an 8.4-ounce can of Red Bull contains 80 milligrams of caffeine) The average of amount of caffeine in regular coffee can vary significantly, usually between 140 and 300 mg.