Question: how much caffeine in a cup of starbucks decaf coffee?
Answer: Caffeine Content of Known Coffee Chains The researchers also purchased Starbucks decaffeinated espresso and brewed coffee and measured their caffeine content. The decaf espresso contained 3–15.8 mg per shot, while the decaf coffee had 12–13.4 mg of caffeine per 16-ounce (473-ml) serving.