Arizona Green Tea has more caffeine than A&W Root Beer on both counts: 7.5mg per 8 oz serving (23 oz can holds ~21.5mg) against 0mg per 12 oz can, and about 1mg per fluid ounce against 0. 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.
A&W Root Beer vs Arizona Green Tea: the numbers
| A&W Root Beer | Arizona Green Tea | |
|---|---|---|
| Caffeine per serving | 0mg per 12 oz can | 7.5mg per 8 oz serving (23 oz can holds ~21.5mg) |
| Caffeine per fl oz | 0.0mg | 0.9mg |
| Servings to reach 400mg (FDA context) | n/a (caffeine-free) | 53.3 |
Sources: A&W Root Beer's figure is verified in our A&W Root Beer caffeine guide against Caffeine Informer (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: Arizona Green Tea packs roughly 94 times the caffeine per ounce. Sipping speed matters at that density; a 8 oz serving (23 oz can holds ~21.5mg) finished in minutes hits differently than the same milligrams spread over a slow cup.
Which one should you pick?
Pick A&W Root Beer when you want the lighter dose or a slower ramp, and Arizona Green Tea 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
- A&W Root Beer: the full caffeine guide
- Arizona Green Tea: the full caffeine guide
- The verified caffeine database
FAQ
Does A&W Root Beer or Arizona Green Tea have more caffeine? Arizona Green Tea: 7.5mg per 8 oz serving (23 oz can holds ~21.5mg) versus 0mg per 12 oz can for A&W Root Beer.
Which is stronger per ounce? Arizona Green Tea, at about 0.9mg per fluid ounce versus 0.0mg for A&W Root Beer.
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.