Celsius has more caffeine than ZOA: 200mg vs 160mg in the same 12 oz can. That is a 40mg gap, and since the cans match, the per-serving number is the whole story.
Celsius vs ZOA: the numbers
| Celsius | ZOA | |
|---|---|---|
| Caffeine per serving | 200mg per 12 oz can | 160mg per 12 oz can |
| Caffeine per fl oz | 16.7mg | 13.3mg |
| Servings to reach 400mg (FDA context) | 2.0 | 2.5 |
Sources: Celsius's figure is verified in our Celsius caffeine guide against Celsius essential facts (source); ZOA's figure is verified in our ZOA guide against ZOA FAQ (source).
Which one should you pick?
Pick ZOA when you want the lighter dose or a slower ramp, and Celsius 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
- Celsius: the full caffeine guide
- ZOA: the full caffeine guide
- The verified caffeine database
- Every drink compared: the comparisons index
FAQ
Does Celsius or ZOA have more caffeine? Celsius: 200mg per 12 oz can versus 160mg per 12 oz can for ZOA.
Which is stronger per ounce? Celsius, at about 16.7mg per fluid ounce versus 13.3mg for ZOA.
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.