Starbucks London Fog has more caffeine than Brisk Iced Tea (Lemon) on both counts: 40mg per 16 oz grande (40mg at every size) against 11mg per 12 oz can, and about 2mg per fluid ounce against 1. The serving sizes differ, so the table below shows both ways of counting.
Starbucks London Fog vs Brisk Iced Tea (Lemon): the numbers
| Starbucks London Fog | Brisk Iced Tea (Lemon) | |
|---|---|---|
| Caffeine per serving | 40mg per 16 oz grande (40mg at every size) | 11mg per 12 oz can |
| Caffeine per fl oz | 2.5mg | 0.9mg |
| Servings to reach 400mg (FDA context) | 10.0 | 36.4 |
Sources: Starbucks London Fog's figure is verified in our Starbucks London Fog caffeine guide against Starbucks nutrition listing (source); Brisk Iced Tea (Lemon)'s figure is verified in our Brisk Iced Tea (Lemon) guide against Caffeine Informer (source).
Which one should you pick?
Pick Brisk Iced Tea (Lemon) when you want the lighter dose or a slower ramp, and Starbucks London Fog 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 London Fog: the full caffeine guide
- Brisk Iced Tea (Lemon): the full caffeine guide
- The verified caffeine database
FAQ
Does Starbucks London Fog or Brisk Iced Tea (Lemon) have more caffeine? Starbucks London Fog: 40mg per 16 oz grande (40mg at every size) versus 11mg per 12 oz can for Brisk Iced Tea (Lemon).
Which is stronger per ounce? Starbucks London Fog, at about 2.5mg per fluid ounce versus 0.9mg for Brisk Iced Tea (Lemon).
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.