Question: how much caffeine in starbucks doubleshot espresso can 6.5 oz?
Answer: Jun 23, 2016 · The Starbucks DoubleShot Espresso contains 125 mg caffeine per 6.5 fl. oz or 192 ml can, this equates to 19.23 mgs of caffeine per fluid ounce (65.03mg/100 ml).