Starbucks Caramel Frappuccino has more caffeine than brewed green tea on both counts: 90mg per 16 oz grande against 28mg per 8 oz cup, and about 6mg per fluid ounce against 4. 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.
Starbucks Caramel Frappuccino vs brewed green tea: the numbers
| Starbucks Caramel Frappuccino | brewed green tea | |
|---|---|---|
| Caffeine per serving | 90mg per 16 oz grande | 28mg per 8 oz cup |
| Caffeine per fl oz | 5.6mg | 3.5mg |
| Servings to reach 400mg (FDA context) | 4.4 | 14.3 |
Sources: Starbucks Caramel Frappuccino's figure is verified in our Starbucks Caramel Frappuccino caffeine guide against Starbucks nutrition listing (source); brewed green tea's figure is verified in our brewed green tea guide against USDA FoodData Central (source).
Which one should you pick?
Pick brewed green tea when you want the lighter dose or a slower ramp, and Starbucks Caramel Frappuccino 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
- Starbucks Caramel Frappuccino: the full caffeine guide
- brewed green tea: the full caffeine guide
- The verified caffeine database
- Every drink compared: the comparisons index
- Compare any two of 120+ drinks
FAQ
Does Starbucks Caramel Frappuccino or brewed green tea have more caffeine? Starbucks Caramel Frappuccino: 90mg per 16 oz grande versus 28mg per 8 oz cup for brewed green tea.
Which is stronger per ounce? Starbucks Caramel Frappuccino, at about 5.6mg per fluid ounce versus 3.5mg for brewed green tea.
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