Prime Energy has more caffeine than English breakfast tea on both counts: 200mg per 12 oz can against 47mg per 8 oz cup, and about 17mg 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.
Prime Energy vs English breakfast tea: the numbers
| Prime Energy | English breakfast tea | |
|---|---|---|
| Caffeine per serving | 200mg per 12 oz can | 47mg per 8 oz cup |
| Caffeine per fl oz | 16.7mg | 5.9mg |
| Servings to reach 400mg (FDA context) | 2.0 | 8.5 |
Sources: Prime Energy's figure is verified in our Prime Energy caffeine guide against Caffeine Informer (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 Prime 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
- Prime Energy: the full caffeine guide
- English breakfast tea: the full caffeine guide
- The verified caffeine database
- Every drink compared: the comparisons index
FAQ
Does Prime Energy or English breakfast tea have more caffeine? Prime Energy: 200mg per 12 oz can versus 47mg per 8 oz cup for English breakfast tea.
Which is stronger per ounce? Prime Energy, at about 16.7mg 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.