Rockstar Original has more caffeine than International Delight iced coffee on both counts: 160mg per 16 oz can against 88mg per 12 oz serving, and about 10mg per fluid ounce against 7. 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.
Rockstar Original vs International Delight iced coffee: the numbers
| Rockstar Original | International Delight iced coffee | |
|---|---|---|
| Caffeine per serving | 160mg per 16 oz can | 88mg per 12 oz serving |
| Caffeine per fl oz | 10.0mg | 7.3mg |
| Servings to reach 400mg (FDA context) | 2.5 | 4.5 |
Sources: Rockstar Original's figure is verified in our Rockstar Original caffeine guide against Rockstar product page (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 Rockstar Original 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
- Rockstar Original: the full caffeine guide
- International Delight iced coffee: the full caffeine guide
- The verified caffeine database
FAQ
Does Rockstar Original or International Delight iced coffee have more caffeine? Rockstar Original: 160mg per 16 oz can versus 88mg per 12 oz serving for International Delight iced coffee.
Which is stronger per ounce? Rockstar Original, at about 10.0mg per fluid ounce versus 7.3mg for International Delight iced coffee.
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.