Starbucks London Fog carries more total caffeine per serving (40mg per 16 oz grande (40mg at every size) vs 34mg per 12 oz can), but ounce for ounce Coca-Cola Classic is actually the stronger drink at about 3mg per fluid ounce against 2. Which one "has more caffeine" depends on whether you measure the container or the concentration.
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.
Coca-Cola Classic vs Starbucks London Fog: the numbers
| Coca-Cola Classic | Starbucks London Fog | |
|---|---|---|
| Caffeine per serving | 34mg per 12 oz can | 40mg per 16 oz grande (40mg at every size) |
| Caffeine per fl oz | 2.8mg | 2.5mg |
| Servings to reach 400mg (FDA context) | 11.8 | 10.0 |
Sources: Coca-Cola Classic's figure is verified in our Coca-Cola Classic caffeine guide against Caffeine Informer (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 Coca-Cola Classic 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
- Coca-Cola Classic: the full caffeine guide
- Starbucks London Fog: the full caffeine guide
- The verified caffeine database
- Every drink compared: the comparisons index
FAQ
Does Coca-Cola Classic or Starbucks London Fog have more caffeine? Starbucks London Fog: 40mg per 16 oz grande (40mg at every size) versus 34mg per 12 oz can for Coca-Cola Classic.
Which is stronger per ounce? Coca-Cola Classic, at about 2.8mg 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.