C4 Performance Energy has more caffeine than International Delight iced coffee on both counts: 200mg per 16 oz can against 88mg per 12 oz serving, and about 12mg per fluid ounce against 7. The serving sizes differ, so the table below shows both ways of counting.
These are different categories of drink, which changes how the caffeine arrives. Energy drinks and sodas list an exact number because caffeine is a measured additive; brewed drinks vary with the beans and the brew, so their figures are compiled averages. The numbers here are the standard published values for each.
International Delight iced coffee vs C4 Performance Energy: the numbers
| International Delight iced coffee | C4 Performance Energy | |
|---|---|---|
| Caffeine per serving | 88mg per 12 oz serving | 200mg per 16 oz can |
| Caffeine per fl oz | 7.3mg | 12.5mg |
| Servings to reach 400mg (FDA context) | 4.5 | 2.0 |
Sources: International Delight iced coffee's figure is verified in our International Delight iced coffee caffeine guide against Caffeine Informer (source); C4 Performance Energy's figure is verified in our C4 Performance Energy guide against Caffeine Informer (source).
Which one should you pick?
Pick International Delight iced coffee when you want the lighter dose or a slower ramp, and C4 Performance Energy 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
- International Delight iced coffee: the full caffeine guide
- C4 Performance Energy: the full caffeine guide
- The verified caffeine database
FAQ
Does International Delight iced coffee or C4 Performance Energy have more caffeine? C4 Performance Energy: 200mg per 16 oz can versus 88mg per 12 oz serving for International Delight iced coffee.
Which is stronger per ounce? C4 Performance Energy, at about 12.5mg per fluid ounce versus 7.3mg for International Delight iced coffee.
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.