SToK Extra Bold cold brew has more caffeine than Pure Leaf black iced tea on both counts: 170mg per 12 oz serving against 54mg per 18.5 oz bottle, and about 14mg per fluid ounce against 3. 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.
SToK Extra Bold cold brew vs Pure Leaf black iced tea: the numbers
| SToK Extra Bold cold brew | Pure Leaf black iced tea | |
|---|---|---|
| Caffeine per serving | 170mg per 12 oz serving | 54mg per 18.5 oz bottle |
| Caffeine per fl oz | 14.2mg | 2.9mg |
| Servings to reach 400mg (FDA context) | 2.4 | 7.4 |
Sources: SToK Extra Bold cold brew's figure is verified in our SToK Extra Bold cold brew caffeine guide against SToK FAQ (source); Pure Leaf black iced tea's figure is verified in our Pure Leaf black iced tea guide against PepsiCo label data (source).
The concentration gap is the striking part: SToK Extra Bold cold brew packs roughly 5 times the caffeine per ounce. Sipping speed matters at that density; a 12 oz serving finished in minutes hits differently than the same milligrams spread over a slow cup.
Which one should you pick?
Pick Pure Leaf black iced tea 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
- SToK Extra Bold cold brew: the full caffeine guide
- Pure Leaf black iced tea: the full caffeine guide
- The verified caffeine database
FAQ
Does SToK Extra Bold cold brew or Pure Leaf black iced tea have more caffeine? SToK Extra Bold cold brew: 170mg per 12 oz serving versus 54mg per 18.5 oz bottle for Pure Leaf black iced tea.
Which is stronger per ounce? SToK Extra Bold cold brew, at about 14.2mg per fluid ounce versus 2.9mg for Pure Leaf black iced tea.
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.