C4 Performance Energy has more caffeine than Pure Leaf black iced tea on both counts: 200mg per 16 oz can against 54mg per 18.5 oz bottle, and about 12mg 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.
Pure Leaf black iced tea vs C4 Performance Energy: the numbers
| Pure Leaf black iced tea | C4 Performance Energy | |
|---|---|---|
| Caffeine per serving | 54mg per 18.5 oz bottle | 200mg per 16 oz can |
| Caffeine per fl oz | 2.9mg | 12.5mg |
| Servings to reach 400mg (FDA context) | 7.4 | 2.0 |
Sources: Pure Leaf black iced tea's figure is verified in our Pure Leaf black iced tea caffeine guide against PepsiCo label data (source); C4 Performance Energy's figure is verified in our C4 Performance Energy guide against Caffeine Informer (source).
The concentration gap is the striking part: C4 Performance Energy packs roughly 4 times the caffeine per ounce. Sipping speed matters at that density; a 16 oz can 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 C4 Performance Energy 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
- Pure Leaf black iced tea: the full caffeine guide
- C4 Performance Energy: the full caffeine guide
- The verified caffeine database
FAQ
Does Pure Leaf black iced tea or C4 Performance Energy have more caffeine? C4 Performance Energy: 200mg per 16 oz can versus 54mg per 18.5 oz bottle for Pure Leaf black iced tea.
Which is stronger per ounce? C4 Performance Energy, at about 12.5mg 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.