UK · Coffee & café
How much caffeine is in Costa Signature Blend Flat White?
241 mgManufacturer listed · Small
Costa lists the standard Flat White as three Cortissimo shots and publishes 241 mg for that extraction.
Source and provenance
- Source type
- Manufacturer
- Market
- UK
- Value basis
- Manufacturer listed
- Source reviewed
- 21 August 2026
- Source version/date
- 30 April 2026
Guide applies 30 April–26 August 2026.
Estimated caffeine remaining over time
These figures apply CaffCalc’s exponential model to the 241 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 | 241 mg | 241 mg | 241 mg |
| 3 | 120.5 mg | 159.0 mg | 179.1 mg |
| 5 | 75.9 mg | 120.5 mg | 146.9 mg |
| 8 | 38.0 mg | 79.5 mg | 109.1 mg |
| 10 | 23.9 mg | 60.3 mg | 89.5 mg |
| 12 | 15.1 mg | 45.7 mg | 73.4 mg |
With the central five-hour model, the estimate falls below 25 mg after approximately 16.3 hours. The faster and slower columns show why one fixed clearance time should not be treated as a personal fact.