Celsius has more caffeine than XS Energy 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.
XS Energy vs Celsius: the numbers
| XS Energy | Celsius | |
|---|---|---|
| Caffeine per serving | 80mg per 8.4 oz can | 200mg per 12 oz can |
| Caffeine per fl oz | 9.5mg | 16.7mg |
| Servings to reach 400mg (FDA context) | 5.0 | 2.0 |
Sources: XS Energy's figure is verified in our XS Energy caffeine guide against Caffeine Informer (source); Celsius's figure is verified in our Celsius guide against Celsius essential facts (source).
Which one should you pick?
Pick XS Energy 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
- XS Energy: the full caffeine guide
- Celsius: the full caffeine guide
- The verified caffeine database
- Every drink compared: the comparisons index
- Compare any two of 120+ drinks
As an Amazon Associate, Barista Life earns from qualifying purchases.
Gear from this guide
FAQ
Does XS Energy or Celsius have more caffeine? Celsius: 200mg per 12 oz can versus 80mg per 8.4 oz can for XS Energy.
Which is stronger per ounce? Celsius, at about 16.7mg per fluid ounce versus 9.5mg for XS Energy.
Barista Life runs on coffee people. Browse the Barista Life shop to support the site.
Get the good coffee stuff
One email a week: what we verified, what is worth buying, and what is not. No spam, unsubscribe any time.