Rockstar XDurance vs brewed coffee: which has more caffeine?

Rockstar XDurance has more caffeine than brewed coffee on both counts: 300mg per 16 oz can against 95mg per 8 oz cup, and about 19mg per fluid ounce against 12. 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.

Rockstar XDurance vs brewed coffee: the numbers

Sources: Rockstar XDurance's figure is verified in our Rockstar XDurance caffeine guide against Rockstar product page / Caffeine Informer (source); brewed coffee's figure is verified in our brewed coffee guide against USDA FoodData Central (source).

Which one should you pick?

Pick brewed coffee when you want the lighter dose or a slower ramp, and Rockstar XDurance 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

• Rockstar XDurance: the full caffeine guide
• brewed coffee: the full caffeine guide
• The verified caffeine database
• Every drink compared: the comparisons index
• Compare any two of 120+ drinks

FAQ

Does Rockstar XDurance or brewed coffee have more caffeine? Rockstar XDurance: 300mg per 16 oz can versus 95mg per 8 oz cup for brewed coffee.

Which is stronger per ounce? Rockstar XDurance, at about 18.8mg per fluid ounce versus 11.9mg for brewed coffee.