Java Monster has more caffeine than AMP Energy Original on both counts: 188mg per 15 oz can against 142mg per 16 oz can, and about 13mg per fluid ounce against 9. The serving sizes differ, so the table below shows both ways of counting.
AMP Energy Original vs Java Monster: the numbers
| AMP Energy Original | Java Monster | |
|---|---|---|
| Caffeine per serving | 142mg per 16 oz can | 188mg per 15 oz can |
| Caffeine per fl oz | 8.9mg | 12.5mg |
| Servings to reach 400mg (FDA context) | 2.8 | 2.1 |
Sources: AMP Energy Original's figure is verified in our AMP Energy Original caffeine guide against Caffeine Informer (source); Java Monster's figure is verified in our Java Monster guide against Caffeine Informer (source).
Which one should you pick?
Pick AMP Energy Original when you want the lighter dose or a slower ramp, and Java Monster 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
- Java Monster: 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 Java Monster have more caffeine? Java Monster: 188mg per 15 oz can versus 142mg per 16 oz can for AMP Energy Original.
Which is stronger per ounce? Java Monster, at about 12.5mg per fluid ounce versus 8.9mg for AMP Energy Original.
Barista Life runs on coffee people. Browse the Barista Life shop to support the site.