Rockstar Punched has more caffeine than brewed green tea on both counts: 240mg per 16 oz can against 28mg per 8 oz cup, and about 15mg per fluid ounce against 4. 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.
Rockstar Punched vs brewed green tea: the numbers
| Rockstar Punched | brewed green tea | |
|---|---|---|
| Caffeine per serving | 240mg per 16 oz can | 28mg per 8 oz cup |
| Caffeine per fl oz | 15.0mg | 3.5mg |
| Servings to reach 400mg (FDA context) | 1.7 | 14.3 |
Sources: Rockstar Punched's figure is verified in our Rockstar Punched caffeine guide against Caffeine Informer (source); brewed green tea's figure is verified in our brewed green tea guide against USDA FoodData Central (source).
The concentration gap is the striking part: Rockstar Punched 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 brewed green tea when you want the lighter dose or a slower ramp, and Rockstar Punched 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
- Rockstar Punched: the full caffeine guide
- brewed green tea: the full caffeine guide
- The verified caffeine database
- Every drink compared: the comparisons index
- Compare any two of 120+ drinks
FAQ
Does Rockstar Punched or brewed green tea have more caffeine? Rockstar Punched: 240mg per 16 oz can versus 28mg per 8 oz cup for brewed green tea.
Which is stronger per ounce? Rockstar Punched, at about 15.0mg per fluid ounce versus 3.5mg for brewed green 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.