Rockstar Pure Zero has more caffeine than Rockstar Original: 240mg vs 160mg in the same 16 oz can. That is a 80mg gap, and since the cans match, the per-serving number is the whole story.
Rockstar Pure Zero vs Rockstar Original: the numbers
| Rockstar Pure Zero | Rockstar Original | |
|---|---|---|
| Caffeine per serving | 240mg per 16 oz can | 160mg per 16 oz can |
| Caffeine per fl oz | 15.0mg | 10.0mg |
| Servings to reach 400mg (FDA context) | 1.7 | 2.5 |
Sources: Rockstar Pure Zero's figure is verified in our Rockstar Pure Zero caffeine guide against Caffeine Informer (source); Rockstar Original's figure is verified in our Rockstar Original guide against Rockstar product page (source).
Which one should you pick?
Pick Rockstar Original when you want the lighter dose or a slower ramp, and Rockstar Pure Zero 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 Pure Zero: the full caffeine guide
- Rockstar Original: the full caffeine guide
- The verified caffeine database
- Every drink compared: the comparisons index
- Compare any two of 120+ drinks
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Gear from this guide
FAQ
Does Rockstar Pure Zero or Rockstar Original have more caffeine? Rockstar Pure Zero: 240mg per 16 oz can versus 160mg per 16 oz can for Rockstar Original.
Which is stronger per ounce? Rockstar Pure Zero, at about 15.0mg per fluid ounce versus 10.0mg for Rockstar Original.
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