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C4 Ultimate Energy has about 300mg of caffeine per 16 oz can. This page lines it up against every drink we have compared it to, sorted strongest first, so you can see exactly where it lands. Every number is the standard published value, sourced on each comparison page.
How C4 Ultimate Energy compares
| Matchup | The other drink |
|---|---|
| C4 Ultimate Energy vs Starbucks cold brew (grande) | 205mg per 16 oz grande |
| C4 Ultimate Energy vs Celsius | 200mg per 12 oz can |
| C4 Ultimate Energy vs Alani Nu | 200mg per 12 oz can |
| C4 Ultimate Energy vs 5-hour Energy (regular) | 200mg per 1.93 oz shot |
| C4 Ultimate Energy vs C4 Performance Energy | 200mg per 16 oz can |
| C4 Ultimate Energy vs Ghost Energy | 200mg per 16 oz can |
| C4 Ultimate Energy vs Monster | 160mg per 16 oz can |
| C4 Ultimate Energy vs Rockstar Original | 160mg per 16 oz can |
| C4 Ultimate Energy vs brewed coffee | 95mg per 8 oz cup |
| C4 Ultimate Energy vs Red Bull | 80mg per 8.4 oz can |
| C4 Ultimate Energy vs espresso | 63mg per 1 oz shot |
Every C4 Ultimate Energy comparison
- C4 Ultimate Energy vs Starbucks cold brew (grande) (205mg per 16 oz grande)
- C4 Ultimate Energy vs Celsius (200mg per 12 oz can)
- C4 Ultimate Energy vs Alani Nu (200mg per 12 oz can)
- C4 Ultimate Energy vs 5-hour Energy (regular) (200mg per 1.93 oz shot)
- C4 Ultimate Energy vs C4 Performance Energy (200mg per 16 oz can)
- C4 Ultimate Energy vs Ghost Energy (200mg per 16 oz can)
- C4 Ultimate Energy vs Monster (160mg per 16 oz can)
- C4 Ultimate Energy vs Rockstar Original (160mg per 16 oz can)
- C4 Ultimate Energy vs brewed coffee (95mg per 8 oz cup)
- C4 Ultimate Energy vs Red Bull (80mg per 8.4 oz can)
- C4 Ultimate Energy vs espresso (63mg per 1 oz shot)
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.
Compare it yourself
Want a matchup that is not listed? The caffeine comparison tool puts C4 Ultimate Energy against any of 248 drinks, and the full caffeine chart shows everything at once.
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Gear from this guide
FAQ
How much caffeine is in C4 Ultimate Energy? About 300mg per 16 oz can, the standard published figure.
What has more caffeine than C4 Ultimate Energy? Among the drinks compared here, Starbucks cold brew (grande) is at the strong end with 205mg per 16 oz grande.
What has less caffeine than C4 Ultimate Energy? On the lighter end, espresso has 63mg per 1 oz shot.
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