Starbucks Doubleshot Espresso & Cream has more caffeine than Arizona Green Tea on both counts: 120mg per 6.5 oz can against 7.5mg per 8 oz serving (23 oz can holds ~21.5mg), and about 18mg per fluid ounce against 1. 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 Doubleshot Espresso & Cream vs Arizona Green Tea: the numbers
| Starbucks Doubleshot Espresso & Cream | Arizona Green Tea | |
|---|---|---|
| Caffeine per serving | 120mg per 6.5 oz can | 7.5mg per 8 oz serving (23 oz can holds ~21.5mg) |
| Caffeine per fl oz | 18.5mg | 0.9mg |
| Servings to reach 400mg (FDA context) | 3.3 | 53.3 |
Sources: Starbucks Doubleshot Espresso & Cream's figure is verified in our Starbucks Doubleshot Espresso & Cream caffeine guide against Caffeine Informer / Starbucks nutrition (source); Arizona Green Tea's figure is verified in our Arizona Green Tea guide against Arizona published figure / Caffeine Informer (source).
The concentration gap is the striking part: Starbucks Doubleshot Espresso & Cream packs roughly 20 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 Arizona Green 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
- Starbucks Doubleshot Espresso & Cream: the full caffeine guide
- Arizona Green Tea: the full caffeine guide
- The verified caffeine database
FAQ
Does Starbucks Doubleshot Espresso & Cream or Arizona Green Tea have more caffeine? Starbucks Doubleshot Espresso & Cream: 120mg per 6.5 oz can versus 7.5mg per 8 oz serving (23 oz can holds ~21.5mg) for Arizona Green Tea.
Which is stronger per ounce? Starbucks Doubleshot Espresso & Cream, at about 18.5mg per fluid ounce versus 0.9mg for Arizona Green 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.