Decaffeinated isn’t the same thing as caffeine-free. An independent lab test of Starbucks coffee showed the following: Decaf Brewed Coffee – 12.0–13.4 mg/16 fl oz serving (Starbucks have decided to list considerably more caffeine than this – 25mg per 16 fl oz). Decaf Espresso – 3.0–15.8 mg/shot. read more