Dunkin Sparkd Energy (medium) carries more total caffeine per serving (144mg per 24 oz medium vs 88mg per 12 oz serving), but ounce for ounce International Delight iced coffee is actually the stronger drink at about 7mg per fluid ounce against 6. 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 Sparkd Energy (medium) vs International Delight iced coffee: the numbers
| Dunkin Sparkd Energy (medium) | International Delight iced coffee | |
|---|---|---|
| Caffeine per serving | 144mg per 24 oz medium | 88mg per 12 oz serving |
| Caffeine per fl oz | 6.0mg | 7.3mg |
| Servings to reach 400mg (FDA context) | 2.8 | 4.5 |
Sources: Dunkin Sparkd Energy (medium)'s figure is verified in our Dunkin Sparkd Energy (medium) caffeine guide against Caffeine Informer Dunkin guide (source); International Delight iced coffee's figure is verified in our International Delight iced coffee guide against Caffeine Informer (source).
Which one should you pick?
Pick International Delight iced coffee 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
- International Delight iced coffee: the full caffeine guide
- The verified caffeine database
FAQ
Does Dunkin Sparkd Energy (medium) or International Delight iced coffee have more caffeine? Dunkin Sparkd Energy (medium): 144mg per 24 oz medium versus 88mg per 12 oz serving for International Delight iced coffee.
Which is stronger per ounce? International Delight iced coffee, at about 7.3mg per fluid ounce versus 6.0mg for Dunkin Sparkd Energy (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.