Gold Peak Sweet Tea has more caffeine than Diet Barq's root beer on both counts: 48mg per 18.5 oz bottle against 0mg per 12 oz can, and about 3mg per fluid ounce against 0. 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.
Gold Peak Sweet Tea vs Diet Barq's root beer: the numbers
| Gold Peak Sweet Tea | Diet Barq's root beer | |
|---|---|---|
| Caffeine per serving | 48mg per 18.5 oz bottle | 0mg per 12 oz can |
| Caffeine per fl oz | 2.6mg | 0.0mg |
| Servings to reach 400mg (FDA context) | 8.3 | n/a (caffeine-free) |
Sources: Gold Peak Sweet Tea's figure is verified in our Gold Peak Sweet Tea caffeine guide against Caffeine Informer (source); Diet Barq's root beer's figure is verified in our Diet Barq's root beer guide against Caffeine Informer / Coca-Cola brand data (source).
The concentration gap is the striking part: Gold Peak Sweet Tea packs roughly 259 times the caffeine per ounce. Sipping speed matters at that density; a 18.5 oz bottle finished in minutes hits differently than the same milligrams spread over a slow cup.
Which one should you pick?
Pick Diet Barq's root beer when you want the lighter dose or a slower ramp, and Gold Peak Sweet Tea 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
- Gold Peak Sweet Tea: the full caffeine guide
- Diet Barq's root beer: the full caffeine guide
- The verified caffeine database
FAQ
Does Gold Peak Sweet Tea or Diet Barq's root beer have more caffeine? Gold Peak Sweet Tea: 48mg per 18.5 oz bottle versus 0mg per 12 oz can for Diet Barq's root beer.
Which is stronger per ounce? Gold Peak Sweet Tea, at about 2.6mg per fluid ounce versus 0.0mg for Diet Barq's root beer.
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.