Chameleon Cold Brew (RTD) has more caffeine than Rockstar Original on both counts: 230mg per 10 oz bottle against 160mg per 16 oz can, and about 23mg per fluid ounce against 10. 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.
Chameleon Cold Brew (RTD) vs Rockstar Original: the numbers
| Chameleon Cold Brew (RTD) | Rockstar Original | |
|---|---|---|
| Caffeine per serving | 230mg per 10 oz bottle | 160mg per 16 oz can |
| Caffeine per fl oz | 23.0mg | 10.0mg |
| Servings to reach 400mg (FDA context) | 1.7 | 2.5 |
Sources: Chameleon Cold Brew (RTD)'s figure is verified in our Chameleon Cold Brew (RTD) 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 Chameleon Cold Brew (RTD) 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
- Chameleon Cold Brew (RTD): 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
FAQ
Does Chameleon Cold Brew (RTD) or Rockstar Original have more caffeine? Chameleon Cold Brew (RTD): 230mg per 10 oz bottle versus 160mg per 16 oz can for Rockstar Original.
Which is stronger per ounce? Chameleon Cold Brew (RTD), at about 23.0mg per fluid ounce versus 10.0mg for Rockstar Original.
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.