Dunkin Sparkd Energy (medium) has more caffeine than Mug Root Beer on both counts: 144mg per 24 oz medium against 0mg per 12 oz can, and about 6mg per fluid ounce against 0. 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 Sparkd Energy (medium) vs Mug Root Beer: the numbers
| Dunkin Sparkd Energy (medium) | Mug Root Beer | |
|---|---|---|
| Caffeine per serving | 144mg per 24 oz medium | 0mg per 12 oz can |
| Caffeine per fl oz | 6.0mg | 0.0mg |
| Servings to reach 400mg (FDA context) | 2.8 | n/a (caffeine-free) |
Sources: Dunkin Sparkd Energy (medium)'s figure is verified in our Dunkin Sparkd Energy (medium) caffeine guide against Caffeine Informer Dunkin guide (source); Mug Root Beer's figure is verified in our Mug Root Beer guide against Caffeine Informer (source).
The concentration gap is the striking part: Dunkin Sparkd Energy (medium) packs roughly 600 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 Mug Root Beer when you want the lighter dose or a slower ramp, and Dunkin Sparkd Energy (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 Sparkd Energy (medium): the full caffeine guide
- Mug Root Beer: the full caffeine guide
- The verified caffeine database
FAQ
Does Dunkin Sparkd Energy (medium) or Mug Root Beer have more caffeine? Dunkin Sparkd Energy (medium): 144mg per 24 oz medium versus 0mg per 12 oz can for Mug Root Beer.
Which is stronger per ounce? Dunkin Sparkd Energy (medium), at about 6.0mg per fluid ounce versus 0.0mg for Mug Root Beer.
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.