Dunkin iced coffee (medium) has more caffeine than Big Red on both counts: 297mg per 24 oz medium against 34mg per 12 oz can, and about 12mg per fluid ounce against 3. The serving sizes differ, so the table below shows both ways of counting.
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 Big Red: the numbers
| Dunkin iced coffee (medium) | Big Red | |
|---|---|---|
| Caffeine per serving | 297mg per 24 oz medium | 34mg per 12 oz can |
| Caffeine per fl oz | 12.4mg | 2.8mg |
| Servings to reach 400mg (FDA context) | 1.3 | 11.8 |
Sources: Dunkin iced coffee (medium)'s figure is verified in our Dunkin iced coffee (medium) caffeine guide against Caffeine Informer Dunkin guide (source); Big Red's figure is verified in our Big Red guide against Caffeine Informer (source).
The concentration gap is the striking part: Dunkin iced coffee (medium) packs roughly 4 times the caffeine per ounce. Sipping speed matters at that density; a 24 oz medium finished in minutes hits differently than the same milligrams spread over a slow cup.
Which one should you pick?
Pick Big Red 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
- Big Red: the full caffeine guide
- The verified caffeine database
FAQ
Does Dunkin iced coffee (medium) or Big Red have more caffeine? Dunkin iced coffee (medium): 297mg per 24 oz medium versus 34mg per 12 oz can for Big Red.
Which is stronger per ounce? Dunkin iced coffee (medium), at about 12.4mg per fluid ounce versus 2.8mg for Big Red.
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.