Bloom Energy has more caffeine than brewed black tea on both counts: 180mg per 12 oz can against 47mg per 8 oz cup, and about 15mg per fluid ounce against 6. 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.
Bloom Energy vs brewed black tea: the numbers
| Bloom Energy | brewed black tea | |
|---|---|---|
| Caffeine per serving | 180mg per 12 oz can | 47mg per 8 oz cup |
| Caffeine per fl oz | 15.0mg | 5.9mg |
| Servings to reach 400mg (FDA context) | 2.2 | 8.5 |
Sources: Bloom Energy's figure is verified in our Bloom Energy caffeine guide against Caffeine Informer (source); brewed black tea's figure is verified in our brewed black tea guide against USDA FoodData Central (source).
Which one should you pick?
Pick brewed black tea 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
- brewed black tea: 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 brewed black tea have more caffeine? Bloom Energy: 180mg per 12 oz can versus 47mg per 8 oz cup for brewed black tea.
Which is stronger per ounce? Bloom Energy, at about 15.0mg per fluid ounce versus 5.9mg for brewed black 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.