UK · Coffee & café
How much caffeine is in Costa Signature Blend Americano?
These estimates combine Costa’s Americano shot-count table with its Signature Blend caffeine-by-shot figures.
Dated Costa reference: the recorded guide covers 30 April–26 August 2026. A newer recipe has not been verified; confirm the current menu before relying on an exact amount.
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Caffeine by serving
| Serving | Caffeine | Basis |
|---|---|---|
| Small | 200 mg | Calculated from manufacturer table |
| Medium | 325 mg | Calculated from manufacturer table |
| Large | 400 mg | Calculated from manufacturer table |
Source and provenance
- Source type
- Manufacturer
- Market
- UK
- Value basis
- Calculated from manufacturer table
- Source reviewed
- 23 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 adjusted 325 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 | 325 mg | 325 mg | 325 mg |
| 3 | 162.5 mg | 214.4 mg | 241.5 mg |
| 5 | 102.4 mg | 162.5 mg | 198.1 mg |
| 8 | 51.2 mg | 107.2 mg | 147.2 mg |
| 10 | 32.2 mg | 81.3 mg | 120.7 mg |
| 12 | 20.3 mg | 61.6 mg | 99.0 mg |
With the central five-hour model, the estimate falls below 25 mg after approximately 18.5 hours. The faster and slower columns show why one fixed clearance time should not be treated as a personal fact.
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