5-hour Energy Extra Strength has more caffeine than Sunkist Zero Sugar on both counts: 230mg per 1.93 oz shot against 19mg per 12 oz can, and about 119mg per fluid ounce against 2. 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.
5-hour Energy Extra Strength vs Sunkist Zero Sugar: the numbers
| 5-hour Energy Extra Strength | Sunkist Zero Sugar | |
|---|---|---|
| Caffeine per serving | 230mg per 1.93 oz shot | 19mg per 12 oz can |
| Caffeine per fl oz | 119.2mg | 1.6mg |
| Servings to reach 400mg (FDA context) | 1.7 | 21.1 |
Sources: 5-hour Energy Extra Strength's figure is verified in our 5-hour Energy Extra Strength caffeine guide against 5-hour Energy facts page (source); Sunkist Zero Sugar's figure is verified in our Sunkist Zero Sugar guide against Caffeine Informer (source).
The concentration gap is the striking part: 5-hour Energy Extra Strength packs roughly 75 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 Sunkist Zero Sugar 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
- 5-hour Energy Extra Strength: the full caffeine guide
- Sunkist Zero Sugar: the full caffeine guide
- The verified caffeine database
FAQ
Does 5-hour Energy Extra Strength or Sunkist Zero Sugar have more caffeine? 5-hour Energy Extra Strength: 230mg per 1.93 oz shot versus 19mg per 12 oz can for Sunkist Zero Sugar.
Which is stronger per ounce? 5-hour Energy Extra Strength, at about 119.2mg per fluid ounce versus 1.6mg for Sunkist Zero Sugar.
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.