UK · Tea
How much caffeine is in Starbucks UK English Breakfast Tea?
Starbucks UK's April 2026 guide lists 41-82 mg caffeine across the documented English Breakfast 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 |
|---|---|---|
| Short | 41 mg | Manufacturer listed |
| Tall | 41 mg | Manufacturer listed |
| Grande | 41 mg | Manufacturer listed |
| Venti | 82 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; Hot Teas 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 41 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 | 41 mg | 41 mg | 41 mg |
| 3 | 20.5 mg | 27.0 mg | 30.5 mg |
| 5 | 12.9 mg | 20.5 mg | 25.0 mg |
| 8 | 6.5 mg | 13.5 mg | 18.6 mg |
| 10 | 4.1 mg | 10.3 mg | 15.2 mg |
| 12 | 2.6 mg | 7.8 mg | 12.5 mg |
With the central five-hour model, the estimate falls below 25 mg after approximately 3.6 hours. The faster and slower columns show why one fixed clearance time should not be treated as a personal fact.