Bloom Energy has more caffeine than Rockstar Boom on both counts: 180mg per 12 oz can against 160mg per 16 oz can, and about 15mg per fluid ounce against 10. The serving sizes differ, so the table below shows both ways of counting.
Bloom Energy vs Rockstar Boom: the numbers
| Bloom Energy | Rockstar Boom | |
|---|---|---|
| Caffeine per serving | 180mg per 12 oz can | 160mg per 16 oz can |
| Caffeine per fl oz | 15.0mg | 10.0mg |
| Servings to reach 400mg (FDA context) | 2.2 | 2.5 |
Sources: Bloom Energy's figure is verified in our Bloom Energy caffeine guide against Caffeine Informer (source); Rockstar Boom's figure is verified in our Rockstar Boom guide against Caffeine Informer (source).
Which one should you pick?
Pick Rockstar Boom when you want the lighter dose or a slower ramp, and Bloom 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
- Bloom Energy: the full caffeine guide
- Rockstar Boom: the full caffeine guide
- The verified caffeine database
- Every drink compared: the comparisons index
- Compare any two of 120+ drinks
FAQ
Does Bloom Energy or Rockstar Boom have more caffeine? Bloom Energy: 180mg per 12 oz can versus 160mg per 16 oz can for Rockstar Boom.
Which is stronger per ounce? Bloom Energy, at about 15.0mg per fluid ounce versus 10.0mg for Rockstar Boom.
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.