espresso vs Dunkin Refresher (medium): which has more caffeine?

Dunkin Refresher (medium) carries more total caffeine per serving (99mg per 24 oz medium vs 63mg per 1 oz shot), but ounce for ounce espresso is actually the stronger drink at about 63mg per fluid ounce against 4. Which one "has more caffeine" depends on whether you measure the container or the concentration.

espresso vs Dunkin Refresher (medium): the numbers

Sources: espresso's figure is verified in our espresso caffeine guide against USDA FoodData Central (source); Dunkin Refresher (medium)'s figure is verified in our Dunkin Refresher (medium) guide against Tasting Table / Dunkin figures (source).

The concentration gap is the striking part: espresso packs roughly 15 times the caffeine per ounce. Sipping speed matters at that density; a 1 oz shot finished in minutes hits differently than the same milligrams spread over a slow cup.

Which one should you pick?

Pick espresso when you want the lighter dose or a slower ramp, and Dunkin Refresher (medium) when you actually need the bigger hit and know your tolerance. If you are stacking either with other caffeinated drinks through the day, run the math against the 400mg reference rather than guessing.

For context, the FDA cites 400mg of caffeine a day as an amount generally not associated with negative effects in healthy adults. Tolerance and health vary, so treat these numbers as information, not advice.

Related reading

• espresso: the full caffeine guide
• Dunkin Refresher (medium): the full caffeine guide
• The verified caffeine database

FAQ

Does espresso or Dunkin Refresher (medium) have more caffeine? Dunkin Refresher (medium): 99mg per 24 oz medium versus 63mg per 1 oz shot for espresso.

Which is stronger per ounce? espresso, at about 63.0mg per fluid ounce versus 4.1mg for Dunkin Refresher (medium).