brewed black tea has more caffeine than Starbucks London Fog on both counts: 47mg per 8 oz cup against 40mg per 16 oz grande (40mg at every size), and about 6mg per fluid ounce against 2. The serving sizes differ, so the table below shows both ways of counting.
brewed black tea vs Starbucks London Fog: the numbers
| brewed black tea | Starbucks London Fog | |
|---|---|---|
| Caffeine per serving | 47mg per 8 oz cup | 40mg per 16 oz grande (40mg at every size) |
| Caffeine per fl oz | 5.9mg | 2.5mg |
| Servings to reach 400mg (FDA context) | 8.5 | 10.0 |
Sources: brewed black tea's figure is verified in our brewed black tea caffeine guide against USDA FoodData Central (source); Starbucks London Fog's figure is verified in our Starbucks London Fog guide against Starbucks nutrition listing (source).
Which one should you pick?
Pick Starbucks London Fog when you want the lighter dose or a slower ramp, and brewed black 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
- brewed black tea: the full caffeine guide
- Starbucks London Fog: the full caffeine guide
- The verified caffeine database
FAQ
Does brewed black tea or Starbucks London Fog have more caffeine? brewed black tea: 47mg per 8 oz cup versus 40mg per 16 oz grande (40mg at every size) for Starbucks London Fog.
Which is stronger per ounce? brewed black tea, at about 5.9mg per fluid ounce versus 2.5mg for Starbucks London Fog.
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.