<img alt='' src='https://secure.gravatar.com/avatar/40f70241ad3e35a6cc2a927c4284e2f6fee8366c15e32f31b496563d517a7d1c?s=50&d=mm&r=g' srcset='https://secure.gravatar.com/avatar/40f70241ad3e35a6cc2a927c4284e2f6fee8366c15e32f31b496563d517a7d1c?s=100&d=mm&r=g 2x' class='avatar avatar-50 photo' height='50' width='50' decoding='async'/><span class="vcard">Priya Venkat</span>

A standard 1 oz shot of espresso carries about 63 mg of caffeine, so a double is roughly 125 mg and six shots reach 378 mg — right at the FDA’s 400 mg daily ceiling. Starbucks pulls stronger shots at about 75 mg each.