UK · Energy drinks
How much caffeine is in Monster Ultra White?
Monster Energy UK lists 150 mg of caffeine in the 500 ml zero-sugar Ultra White can.
Interactive serving
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Source and provenance
- Source type
- Manufacturer
- Market
- UK
- Value basis
- Manufacturer listed
- Source reviewed
- 4 September 2026
Official UK product page; Monster notes figures are based on 500 ml and can vary by region.
Estimated caffeine remaining over time
These figures apply CaffCalc’s exponential model to the adjusted 150 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 | 150 mg | 150 mg | 150 mg |
| 3 | 75 mg | 99.0 mg | 111.4 mg |
| 5 | 47.2 mg | 75 mg | 91.4 mg |
| 8 | 23.6 mg | 49.5 mg | 67.9 mg |
| 10 | 14.9 mg | 37.5 mg | 55.7 mg |
| 12 | 9.4 mg | 28.4 mg | 45.7 mg |
With the central five-hour model, the estimate falls below 25 mg after approximately 12.9 hours. The faster and slower columns show why one fixed clearance time should not be treated as a personal fact.
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