Reign Storm has more caffeine than SToK Extra Bold cold brew: 200mg vs 170mg in the same 12 oz can. That is a 30mg gap, and since the cans match, the per-serving number is the whole story.
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.
SToK Extra Bold cold brew vs Reign Storm: the numbers
| SToK Extra Bold cold brew | Reign Storm | |
|---|---|---|
| Caffeine per serving | 170mg per 12 oz serving | 200mg per 12 oz can |
| Caffeine per fl oz | 14.2mg | 16.7mg |
| Servings to reach 400mg (FDA context) | 2.4 | 2.0 |
Sources: SToK Extra Bold cold brew's figure is verified in our SToK Extra Bold cold brew caffeine guide against SToK FAQ (source); Reign Storm's figure is verified in our Reign Storm guide against Caffeine Informer (source).
Which one should you pick?
Pick SToK Extra Bold cold brew when you want the lighter dose or a slower ramp, and Reign Storm 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
- SToK Extra Bold cold brew: the full caffeine guide
- Reign Storm: the full caffeine guide
- The verified caffeine database
FAQ
Does SToK Extra Bold cold brew or Reign Storm have more caffeine? Reign Storm: 200mg per 12 oz can versus 170mg per 12 oz serving for SToK Extra Bold cold brew.
Which is stronger per ounce? Reign Storm, at about 16.7mg per fluid ounce versus 14.2mg for SToK Extra Bold cold brew.
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.