US · Energy drinks
How much caffeine is in Rockstar Original Energy?
Caffeine for the current US 16 fl oz Original can. Other Rockstar lines include materially different caffeine amounts.
Interactive serving
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Source and provenance
- Source type
- Manufacturer
- Market
- US
- Value basis
- Manufacturer listed
- Source reviewed
- 21 August 2026
US Original product; other Rockstar ranges and countries differ.
Estimated caffeine remaining over time
These figures apply CaffCalc’s exponential model to the adjusted 160 mg starting value. They are calculations, not measurements of caffeine in a particular person.
| Hours elapsed | 3-hour half-life | 5-hour half-life | 7-hour half-life |
|---|---|---|---|
| 0 | 160 mg | 160 mg | 160 mg |
| 3 | 80 mg | 105.6 mg | 118.9 mg |
| 5 | 50.4 mg | 80 mg | 97.5 mg |
| 8 | 25.2 mg | 52.8 mg | 72.5 mg |
| 10 | 15.9 mg | 40 mg | 59.4 mg |
| 12 | 10 mg | 30.3 mg | 48.8 mg |
With the central five-hour model, the estimate falls below 25 mg after approximately 13.4 hours. The faster and slower columns show why one fixed clearance time should not be treated as a personal fact.
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Same category, lower documented dose
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These suggestions use documented servings in the same category and compare caffeine quantity only. Check the evidence badge before relying on a reported figure.