SToK Extra Bold cold brew has more caffeine than Mountain Dew Zero Sugar: 170mg vs 68mg in the same 12 oz serving. That is a 102mg 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.
Mountain Dew Zero Sugar vs SToK Extra Bold cold brew: the numbers
| Mountain Dew Zero Sugar | SToK Extra Bold cold brew | |
|---|---|---|
| Caffeine per serving | 68mg per 12 oz can | 170mg per 12 oz serving |
| Caffeine per fl oz | 5.7mg | 14.2mg |
| Servings to reach 400mg (FDA context) | 5.9 | 2.4 |
Sources: Mountain Dew Zero Sugar's figure is verified in our Mountain Dew Zero Sugar caffeine guide against PepsiCo product facts (source); SToK Extra Bold cold brew's figure is verified in our SToK Extra Bold cold brew guide against SToK FAQ (source).
Which one should you pick?
Pick Mountain Dew Zero Sugar when you want the lighter dose or a slower ramp, and SToK Extra Bold cold brew 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
- Mountain Dew Zero Sugar: the full caffeine guide
- SToK Extra Bold cold brew: the full caffeine guide
- The verified caffeine database
FAQ
Does Mountain Dew Zero Sugar or SToK Extra Bold cold brew have more caffeine? SToK Extra Bold cold brew: 170mg per 12 oz serving versus 68mg per 12 oz can for Mountain Dew Zero Sugar.
Which is stronger per ounce? SToK Extra Bold cold brew, at about 14.2mg per fluid ounce versus 5.7mg for Mountain Dew Zero Sugar.
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.