Poppi Classic Cola has more caffeine than Barq's root beer: 40mg vs 22mg in the same 12 oz can. That is a 18mg gap, and since the cans match, the per-serving number is the whole story.
Barq's root beer vs Poppi Classic Cola: the numbers
| Barq's root beer | Poppi Classic Cola | |
|---|---|---|
| Caffeine per serving | 22mg per 12 oz can | 40mg per 12 oz can |
| Caffeine per fl oz | 1.8mg | 3.3mg |
| Servings to reach 400mg (FDA context) | 18.2 | 10.0 |
Sources: Barq's root beer's figure is verified in our Barq's root beer caffeine guide against Coca-Cola brand data (source); Poppi Classic Cola's figure is verified in our Poppi Classic Cola guide against Caffeine Informer (source).
Which one should you pick?
Pick Barq's root beer when you want the lighter dose or a slower ramp, and Poppi Classic Cola 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
- Barq's root beer: the full caffeine guide
- Poppi Classic Cola: the full caffeine guide
- The verified caffeine database
FAQ
Does Barq's root beer or Poppi Classic Cola have more caffeine? Poppi Classic Cola: 40mg per 12 oz can versus 22mg per 12 oz can for Barq's root beer.
Which is stronger per ounce? Poppi Classic Cola, at about 3.3mg per fluid ounce versus 1.8mg for Barq's root beer.
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