Starbucks Chai Latte has more caffeine than Mountain Dew on both counts: 95mg per 16 oz grande against 54mg per 12 oz can, 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 Chai Latte vs Mountain Dew: the numbers
| Starbucks Chai Latte | Mountain Dew | |
|---|---|---|
| Caffeine per serving | 95mg per 16 oz grande | 54mg per 12 oz can |
| Caffeine per fl oz | 5.9mg | 4.5mg |
| Servings to reach 400mg (FDA context) | 4.2 | 7.4 |
Sources: Starbucks Chai Latte's figure is verified in our Starbucks Chai Latte caffeine guide against Starbucks nutrition listing (source); Mountain Dew's figure is verified in our Mountain Dew guide against Caffeine Informer (source).
Which one should you pick?
Pick Mountain Dew when you want the lighter dose or a slower ramp, and Starbucks Chai Latte 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 Chai Latte: the full caffeine guide
- Mountain Dew: the full caffeine guide
- The verified caffeine database
- Every drink compared: the comparisons index
FAQ
Does Starbucks Chai Latte or Mountain Dew have more caffeine? Starbucks Chai Latte: 95mg per 16 oz grande versus 54mg per 12 oz can for Mountain Dew.
Which is stronger per ounce? Starbucks Chai Latte, at about 5.9mg per fluid ounce versus 4.5mg for Mountain Dew.
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.