UK · Coffee & café
How much caffeine is in Greggs Americano?
Greggs doesn’t measure caffeine. Which? says Greggs supplied these indicative supplier figures as a guide, not an exact measure.
Which? reported an indicative 257 mg for a 382 ml large Greggs Americano in August 2026; it’s a supplier guide, not an exact measurement.
Interactive serving
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Where this figure comes from
- Source type
- Independent publisher
- Market
- UK
- How we got the amount
- Reported by independent comparison
- Source reviewed
- 4 September 2026
- Source version/date
- 25 August 2026
Which? says it asked five chains for caffeine information and used online guides; many figures were obtained through brand press offices. The brand’s public UK menu doesn’t publish this value, so treat it as a reported figure rather than a first-party public listing.
Estimated caffeine remaining over time
These figures apply CaffCalc’s exponential model to the adjusted 257 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 | 257 mg | 257 mg | 257 mg |
| 3 | 128.5 mg | 169.6 mg | 191.0 mg |
| 5 | 80.9 mg | 128.5 mg | 156.6 mg |
| 8 | 40.5 mg | 84.8 mg | 116.4 mg |
| 10 | 25.5 mg | 64.3 mg | 95.5 mg |
| 12 | 16.1 mg | 48.7 mg | 78.3 mg |
With the central five-hour model, the estimate falls below 25 mg after approximately 16.8 hours. The faster and slower columns show why one fixed clearance time shouldn’t be treated as a personal fact.
Use this caffeine value
Use this amount in a calculation, or save the drink to your tracker on this device.
Same category, lower documented dose
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