5-hour Energy Extra Strength has more caffeine than Big Red on both counts: 230mg per 1.93 oz shot against 34mg per 12 oz can, and about 119mg per fluid ounce against 3. 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.
Big Red vs 5-hour Energy Extra Strength: the numbers
| Big Red | 5-hour Energy Extra Strength | |
|---|---|---|
| Caffeine per serving | 34mg per 12 oz can | 230mg per 1.93 oz shot |
| Caffeine per fl oz | 2.8mg | 119.2mg |
| Servings to reach 400mg (FDA context) | 11.8 | 1.7 |
Sources: Big Red's figure is verified in our Big Red caffeine guide against Caffeine Informer (source); 5-hour Energy Extra Strength's figure is verified in our 5-hour Energy Extra Strength guide against 5-hour Energy facts page (source).
The concentration gap is the striking part: 5-hour Energy Extra Strength packs roughly 42 times the caffeine per ounce. Sipping speed matters at that density; a 1.93 oz shot finished in minutes hits differently than the same milligrams spread over a slow cup.
Which one should you pick?
Pick Big Red when you want the lighter dose or a slower ramp, and 5-hour Energy Extra Strength 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
- Big Red: the full caffeine guide
- 5-hour Energy Extra Strength: the full caffeine guide
- The verified caffeine database
FAQ
Does Big Red or 5-hour Energy Extra Strength have more caffeine? 5-hour Energy Extra Strength: 230mg per 1.93 oz shot versus 34mg per 12 oz can for Big Red.
Which is stronger per ounce? 5-hour Energy Extra Strength, at about 119.2mg per fluid ounce versus 2.8mg for Big Red.
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.