Coca-Cola Classic has more caffeine than Caffeine Free Coca-Cola: 34mg vs 0mg in the same 12 oz can. That is a 34mg gap, and since the cans match, the per-serving number is the whole story.
Caffeine Free Coca-Cola vs Coca-Cola Classic: the numbers
| Caffeine Free Coca-Cola | Coca-Cola Classic | |
|---|---|---|
| Caffeine per serving | 0mg per 12 oz can | 34mg per 12 oz can |
| Caffeine per fl oz | 0.0mg | 2.8mg |
| Servings to reach 400mg (FDA context) | n/a (caffeine-free) | 11.8 |
Sources: Caffeine Free Coca-Cola's figure is verified in our Caffeine Free Coca-Cola caffeine guide against Caffeine Informer (source); Coca-Cola Classic's figure is verified in our Coca-Cola Classic guide against Caffeine Informer (source).
The concentration gap could not be simpler: Caffeine Free Coke has no caffeine at all, so the Coca-Cola Classic figure of 34mg per 12 oz can is the entire difference.
Which one should you pick?
Pick Caffeine Free Coca-Cola when you want the lighter dose or a slower ramp, and Coca-Cola Classic 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
- Caffeine Free Coca-Cola: the full caffeine guide
- Coca-Cola Classic: the full caffeine guide
- The verified caffeine database
- Every drink compared: the comparisons index
- Compare any two of 120+ drinks
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Gear from this guide
FAQ
Does Caffeine Free Coca-Cola or Coca-Cola Classic have more caffeine? Coca-Cola Classic: 34mg per 12 oz can versus 0mg per 12 oz can for Caffeine Free Coca-Cola.
Which is stronger per ounce? Coca-Cola Classic, at about 2.8mg per fluid ounce versus 0.0mg for Caffeine Free Coca-Cola.
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