Sunkist Zero Sugar has more caffeine than Fanta Orange: 19mg vs 0mg in the same 12 oz can. That is a 19mg gap, and since the cans match, the per-serving number is the whole story.
Fanta Orange vs Sunkist Zero Sugar: the numbers
| Fanta Orange | Sunkist Zero Sugar | |
|---|---|---|
| Caffeine per serving | 0mg per 12 oz can | 19mg per 12 oz can |
| Caffeine per fl oz | 0.0mg | 1.6mg |
| Servings to reach 400mg (FDA context) | n/a (caffeine-free) | 21.1 |
Sources: Fanta Orange's figure is verified in our Fanta Orange caffeine guide against Caffeine Informer (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: Sunkist Zero Sugar packs roughly 158 times the caffeine per ounce. Sipping speed matters at that density; a 12 oz can finished in minutes hits differently than the same milligrams spread over a slow cup.
Which one should you pick?
Pick Fanta Orange when you want the lighter dose or a slower ramp, and Sunkist Zero Sugar 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
- Fanta Orange: the full caffeine guide
- Sunkist Zero Sugar: the full caffeine guide
- The verified caffeine database
FAQ
Does Fanta Orange or Sunkist Zero Sugar have more caffeine? Sunkist Zero Sugar: 19mg per 12 oz can versus 0mg per 12 oz can for Fanta Orange.
Which is stronger per ounce? Sunkist Zero Sugar, at about 1.6mg per fluid ounce versus 0.0mg for Fanta Orange.
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.