UK · Coffee & café
How much caffeine is in Starbucks UK Iced Brown Sugar Shaken Espresso?
Starbucks UK's April 2026 guide lists 85.5-171 mg caffeine across the documented Iced Brown Sugar Shaken Espresso sizes. Values apply to standard recipes before customisation.
Interactive serving
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Choose a documented size, then change the quantity. The caffeine total and timeline update together.
Caffeine by serving
| Serving | Caffeine | Basis |
|---|---|---|
| Tall | 85.5 mg | Manufacturer listed |
| Grande | 128.2 mg | Manufacturer listed |
| Venti | 171 mg | Manufacturer listed |
Source and provenance
- Source type
- Manufacturer
- Market
- UK
- Value basis
- Manufacturer listed
- Source reviewed
- 23 August 2026
- Source version/date
- 16 April 2026
Core beverage guide version 16 April 2026; Iced Coffee table. Milk substitutions and other customisations can change the finished drink.
Estimated caffeine remaining over time
These figures apply CaffCalc’s exponential model to the adjusted 128.2 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 | 128.2 mg | 128.2 mg | 128.2 mg |
| 3 | 64.1 mg | 84.6 mg | 95.3 mg |
| 5 | 40.4 mg | 64.1 mg | 78.1 mg |
| 8 | 20.2 mg | 42.3 mg | 58.1 mg |
| 10 | 12.7 mg | 32.0 mg | 47.6 mg |
| 12 | 8.0 mg | 24.3 mg | 39.1 mg |
With the central five-hour model, the estimate falls below 25 mg after approximately 11.8 hours. The faster and slower columns show why one fixed clearance time should not be treated as a personal fact.