Celsius has more caffeine than Red Bull on both counts: 200mg per 12 oz can against 80mg per 8.4 oz can, and about 17mg per fluid ounce against 10. The serving sizes differ, so the table below shows both ways of counting.
Celsius vs Red Bull: the numbers
| Celsius | Red Bull | |
|---|---|---|
| Caffeine per serving | 200mg per 12 oz can | 80mg per 8.4 oz can |
| Caffeine per fl oz | 16.7mg | 9.5mg |
| Servings to reach 400mg (FDA context) | 2.0 | 5.0 |
Sources: Celsius's figure is verified in our Celsius caffeine guide against Celsius essential facts (source); Red Bull's figure is verified in our Red Bull guide against Red Bull label / Caffeine Informer (source).
Which one should you pick?
Pick Red Bull 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
FAQ
Does Celsius or Red Bull have more caffeine? Celsius: 200mg per 12 oz can versus 80mg per 8.4 oz can for Red Bull.
Which is stronger per ounce? Celsius, at about 16.7mg per fluid ounce versus 9.5mg for Red Bull.
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