Starbucks Doubleshot Espresso & Cream has more caffeine than English breakfast tea on both counts: 120mg per 6.5 oz can against 47mg per 8 oz cup, and about 18mg 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.
English breakfast tea vs Starbucks Doubleshot Espresso & Cream: the numbers
| English breakfast tea | Starbucks Doubleshot Espresso & Cream | |
|---|---|---|
| Caffeine per serving | 47mg per 8 oz cup | 120mg per 6.5 oz can |
| Caffeine per fl oz | 5.9mg | 18.5mg |
| Servings to reach 400mg (FDA context) | 8.5 | 3.3 |
Sources: English breakfast tea's figure is verified in our English breakfast tea caffeine guide against Twinings published figure (source); Starbucks Doubleshot Espresso & Cream's figure is verified in our Starbucks Doubleshot Espresso & Cream guide against Caffeine Informer / Starbucks nutrition (source).
The concentration gap is the striking part: Starbucks Doubleshot Espresso & Cream packs roughly 3 times the caffeine per ounce. Sipping speed matters at that density; a 6.5 oz can finished in minutes hits differently than the same milligrams spread over a slow cup.
Which one should you pick?
Pick English breakfast tea when you want the lighter dose or a slower ramp, and Starbucks Doubleshot Espresso & Cream 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
- English breakfast tea: the full caffeine guide
- Starbucks Doubleshot Espresso & Cream: the full caffeine guide
- The verified caffeine database
FAQ
Does English breakfast tea or Starbucks Doubleshot Espresso & Cream have more caffeine? Starbucks Doubleshot Espresso & Cream: 120mg per 6.5 oz can versus 47mg per 8 oz cup for English breakfast tea.
Which is stronger per ounce? Starbucks Doubleshot Espresso & Cream, at about 18.5mg per fluid ounce versus 5.9mg for English breakfast 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.