High Brew Double Espresso has more caffeine than brewed black tea: 140mg vs 47mg in the same 8 oz can. That is a 93mg gap, and since the cans match, the per-serving number is the whole story.
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.
brewed black tea vs High Brew Double Espresso: the numbers
| brewed black tea | High Brew Double Espresso | |
|---|---|---|
| Caffeine per serving | 47mg per 8 oz cup | 140mg per 8 oz can |
| Caffeine per fl oz | 5.9mg | 17.5mg |
| Servings to reach 400mg (FDA context) | 8.5 | 2.9 |
Sources: brewed black tea's figure is verified in our brewed black tea caffeine guide against USDA FoodData Central (source); High Brew Double Espresso's figure is verified in our High Brew Double Espresso guide against Caffeine Informer (source).
Which one should you pick?
Pick brewed black tea when you want the lighter dose or a slower ramp, and High Brew Double Espresso 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
- brewed black tea: the full caffeine guide
- High Brew Double Espresso: the full caffeine guide
- The verified caffeine database
FAQ
Does brewed black tea or High Brew Double Espresso have more caffeine? High Brew Double Espresso: 140mg per 8 oz can versus 47mg per 8 oz cup for brewed black tea.
Which is stronger per ounce? High Brew Double Espresso, at about 17.5mg 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.