UK · Tea
How much caffeine is in Starbucks UK Peach Iced Tea?
Starbucks UK's April 2026 guide lists 0.6-1.1 mg caffeine across the documented Peach Iced Tea sizes. Values apply to standard recipes before customisation.
Interactive serving
Adjust this serving
Choose a documented size, then change the quantity. The caffeine total and timeline update together.
Caffeine by serving
| Serving | Caffeine | Basis |
|---|---|---|
| Tall | 0.6 mg | Manufacturer listed |
| Grande | 1 mg | Manufacturer listed |
| Venti | 1.1 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 Teas & Refreshers 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 1 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 | 1 mg | 1 mg | 1 mg |
| 3 | 0.5 mg | 0.7 mg | 0.7 mg |
| 5 | 0.3 mg | 0.5 mg | 0.6 mg |
| 8 | 0.2 mg | 0.3 mg | 0.5 mg |
| 10 | 0.1 mg | 0.3 mg | 0.4 mg |
| 12 | 0.1 mg | 0.2 mg | 0.3 mg |
With the central five-hour model, the estimate falls below 25 mg after approximately 0.0 hours. The faster and slower columns show why one fixed clearance time should not be treated as a personal fact.