Dunkin iced coffee (medium) carries more total caffeine per serving (297mg per 24 oz medium vs 230mg per 1.93 oz shot), but ounce for ounce 5-hour Energy Extra Strength is actually the stronger drink at about 119mg per fluid ounce against 12. Which one "has more caffeine" depends on whether you measure the container or the concentration.
These are different categories of drink, which changes how the caffeine arrives. Energy drinks and sodas list an exact number because caffeine is a measured additive; brewed drinks vary with the beans and the brew, so their figures are compiled averages. The numbers here are the standard published values for each.
Dunkin iced coffee (medium) vs 5-hour Energy Extra Strength: the numbers
| Dunkin iced coffee (medium) | 5-hour Energy Extra Strength | |
|---|---|---|
| Caffeine per serving | 297mg per 24 oz medium | 230mg per 1.93 oz shot |
| Caffeine per fl oz | 12.4mg | 119.2mg |
| Servings to reach 400mg (FDA context) | 1.3 | 1.7 |
Sources: Dunkin iced coffee (medium)'s figure is verified in our Dunkin iced coffee (medium) caffeine guide against Caffeine Informer Dunkin guide (source); 5-hour Energy Extra Strength's figure is verified in our 5-hour Energy Extra Strength guide against 5-hour Energy facts page (source).
The concentration gap is the striking part: 5-hour Energy Extra Strength packs roughly 10 times the caffeine per ounce. Sipping speed matters at that density; a 1.93 oz shot finished in minutes hits differently than the same milligrams spread over a slow cup.
Which one should you pick?
Pick 5-hour Energy Extra Strength 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
- Dunkin iced coffee (medium): the full caffeine guide
- 5-hour Energy Extra Strength: the full caffeine guide
- The verified caffeine database
- Every drink compared: the comparisons index
FAQ
Does Dunkin iced coffee (medium) or 5-hour Energy Extra Strength have more caffeine? Dunkin iced coffee (medium): 297mg per 24 oz medium versus 230mg per 1.93 oz shot for 5-hour Energy Extra Strength.
Which is stronger per ounce? 5-hour Energy Extra Strength, at about 119.2mg 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.