UK · Coffee & café
How much caffeine is in Greggs Americano?
Greggs does not 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 is a supplier guide, not an exact measurement.
Interactive serving
Adjust this serving
Choose a documented size, then change the quantity. The caffeine total and timeline update together.
Source and provenance
- Source type
- Independent publisher
- Market
- UK
- Value basis
- 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 does not 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 should not be treated as a personal fact.
Use this caffeine value
Carry the selected serving into a calculation or save it for quicker private tracking on this device.
Same category, lower documented dose
Looking for less caffeine?
These suggestions use documented servings in the same category and compare caffeine quantity only. Check the evidence badge before relying on a reported figure.