Starbucks Iced Coffee has more caffeine than Dr Pepper on both counts: 165mg per 16 oz grande against 41mg per 12 oz can, and about 10mg 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.
Starbucks Iced Coffee vs Dr Pepper: the numbers
| Starbucks Iced Coffee | Dr Pepper | |
|---|---|---|
| Caffeine per serving | 165mg per 16 oz grande | 41mg per 12 oz can |
| Caffeine per fl oz | 10.3mg | 3.4mg |
| Servings to reach 400mg (FDA context) | 2.4 | 9.8 |
Sources: Starbucks Iced Coffee's figure is verified in our Starbucks Iced Coffee caffeine guide against Starbucks nutrition listing (source); Dr Pepper's figure is verified in our Dr Pepper guide against KDP product facts / Caffeine Informer (source).
The concentration gap is the striking part: Starbucks Iced Coffee packs roughly 3 times the caffeine per ounce. Sipping speed matters at that density; a 16 oz grande finished in minutes hits differently than the same milligrams spread over a slow cup.
Which one should you pick?
Pick Dr Pepper when you want the lighter dose or a slower ramp, and Starbucks Iced Coffee 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
- Starbucks Iced Coffee: the full caffeine guide
- Dr Pepper: the full caffeine guide
- The verified caffeine database
- Every drink compared: the comparisons index
- Compare any two of 120+ drinks
FAQ
Does Starbucks Iced Coffee or Dr Pepper have more caffeine? Starbucks Iced Coffee: 165mg per 16 oz grande versus 41mg per 12 oz can for Dr Pepper.
Which is stronger per ounce? Starbucks Iced Coffee, at about 10.3mg per fluid ounce versus 3.4mg for Dr Pepper.
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