AMP Energy Original has more caffeine than Aspire Energy on both counts: 142mg per 16 oz can against 80mg per 12 oz can, and about 9mg per fluid ounce against 7. The serving sizes differ, so the table below shows both ways of counting.
AMP Energy Original vs Aspire Energy: the numbers
| AMP Energy Original | Aspire Energy | |
|---|---|---|
| Caffeine per serving | 142mg per 16 oz can | 80mg per 12 oz can |
| Caffeine per fl oz | 8.9mg | 6.7mg |
| Servings to reach 400mg (FDA context) | 2.8 | 5.0 |
Sources: AMP Energy Original's figure is verified in our AMP Energy Original caffeine guide against Caffeine Informer (source); Aspire Energy's figure is verified in our Aspire Energy guide against Aspire / Caffeine Informer (source).
Which one should you pick?
Pick Aspire Energy when you want the lighter dose or a slower ramp, and AMP Energy Original 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
- AMP Energy Original: the full caffeine guide
- Aspire Energy: the full caffeine guide
- The verified caffeine database
- Every drink compared: the comparisons index
- Compare any two of 120+ drinks
FAQ
Does AMP Energy Original or Aspire Energy have more caffeine? AMP Energy Original: 142mg per 16 oz can versus 80mg per 12 oz can for Aspire Energy.
Which is stronger per ounce? AMP Energy Original, at about 8.9mg per fluid ounce versus 6.7mg for Aspire Energy.
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