SToK Extra Bold cold brew has more caffeine than English breakfast tea on both counts: 170mg per 12 oz serving against 47mg per 8 oz cup, and about 14mg 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.
SToK Extra Bold cold brew vs English breakfast tea: the numbers
| SToK Extra Bold cold brew | English breakfast tea | |
|---|---|---|
| Caffeine per serving | 170mg per 12 oz serving | 47mg per 8 oz cup |
| Caffeine per fl oz | 14.2mg | 5.9mg |
| Servings to reach 400mg (FDA context) | 2.4 | 8.5 |
Sources: SToK Extra Bold cold brew's figure is verified in our SToK Extra Bold cold brew caffeine guide against SToK FAQ (source); English breakfast tea's figure is verified in our English breakfast tea guide against Twinings published figure (source).
Which one should you pick?
Pick English breakfast tea when you want the lighter dose or a slower ramp, and SToK Extra Bold cold brew 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
- SToK Extra Bold cold brew: the full caffeine guide
- English breakfast tea: the full caffeine guide
- The verified caffeine database
- Every drink compared: the comparisons index
FAQ
Does SToK Extra Bold cold brew or English breakfast tea have more caffeine? SToK Extra Bold cold brew: 170mg per 12 oz serving versus 47mg per 8 oz cup for English breakfast tea.
Which is stronger per ounce? SToK Extra Bold cold brew, at about 14.2mg 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.