Dunkin iced coffee (medium) carries more total caffeine per serving (297mg 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 12. Which one "has more caffeine" depends on whether you measure the container or the concentration.
espresso vs Dunkin iced coffee (medium): the numbers
| espresso | Dunkin iced coffee (medium) | |
|---|---|---|
| Caffeine per serving | 63mg per 1 oz shot | 297mg per 24 oz medium |
| Caffeine per fl oz | 63.0mg | 12.4mg |
| Servings to reach 400mg (FDA context) | 6.3 | 1.3 |
Sources: espresso's figure is verified in our espresso caffeine guide against USDA FoodData Central (source); Dunkin iced coffee (medium)'s figure is verified in our Dunkin iced coffee (medium) guide against Caffeine Informer Dunkin guide (source).
The concentration gap is the striking part: espresso packs roughly 5 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 iced coffee (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 iced coffee (medium): the full caffeine guide
- The verified caffeine database
- Every drink compared: the comparisons index
FAQ
Does espresso or Dunkin iced coffee (medium) have more caffeine? Dunkin iced coffee (medium): 297mg 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 12.4mg for Dunkin iced coffee (medium).
Comparing caffeine? The caffeine comparison tool puts hundreds of drinks side by side, and the caffeine curfew calculator can check your cutoff time for tonight.