What is a lot or microlot in coffee?
A coffee lot is a homogeneous quantity of green coffee from the same origin, processed identically and presenting a coherent sensory profile. A microlot is a very small lot — generally fewer than 20 bags of 60kg (less than 1.2 tonnes) — from a specific plot, selective harvest or experimental processing on a farm or cooperative. The small size of a microlot reflects more rigorous selection and a more precise aromatic profile.
The distinction between lot and microlot is not strictly codified in the profession, but a general convention has been established: a 'commercial lot' often exceeds 20 to 50 bags (1.2 to 3 tonnes), while a microlot is below 10-20 bags. Some specialty roasters even speak of 'nanolots' for lots below 5 bags, or even 1-2 bags.
The interest of a microlot for roaster and consumer is multiple. First, plot-level selection: on the same farm, different plots (altitude, exposure, variety) can produce radically different profiles. By identifying and separating the best plots, the producer can access much higher prices. Second, maximum traceability: a microlot can be traced to picking date, picker's name, GPS plot, processing type — a level of documentation comparable to a Bordeaux grand cru.
Producing microlots requires specific investments: lot separation at the farm (dedicated fermenters, drying tables), intensive hand sorting, individual lot quality analysis (separate cupping), and distinct export logistics. These additional costs explain why microlots sell at prices two to ten times above standard commercial lots.
In specialty coffee commerce, microlots often appear on packaging with precise labelling: 'Plot A, altitude 1850m, 72h anaerobic fermentation, October 2025 harvest'. This nomenclature, resembling that of fine wines, signals to the informed consumer that they are facing a unique, traced and documented terroir product. In Belgium, a handful of avant-garde roasters offer microlots in very limited quantities, often sold out within weeks to a connoisseur clientele who follow their releases with the same attention a collector gives to a wine estate.
Commercial lot vs microlot vs nanolot
| Term | Indicative volume | Typical traceability | Relative price |
|---|---|---|---|
| Commercial lot | > 50 bags (> 3 tonnes) | Country + region + cooperative | Market base |
| Premium lot | 20-50 bags (1.2-3 tonnes) | Cooperative or washing station | 1.5× to 2× base |
| Microlot | 5-20 bags (300kg - 1.2t) | Individual farm, plot | 2× to 5× base |
| Nanolot | 1-5 bags (60-300kg) | Specific plot, dated harvest | 5× to 10× base |
| Experimental lot | < 1 bag (< 60kg) | Farm + unique process + date | Auction price (variable) |
How lot size shapes traceability and price
The distinction between a 'lot' and a 'microlot' in specialty coffee is not always precisely defined, but the general principle is scale: a standard lot might represent the combined production of several farms or a large section of a cooperative's annual harvest — perhaps 5,000 to 20,000 kg — while a microlot represents a more granular unit, often a single farm's production from a specific picking date, altitude band, or processing batch. Microlot scale might be 200–2,000 kg. Some nanolot producers (a term used loosely) sell lots of under 100 kg representing a single tree's annual production or a single experimental processing batch.
The economic logic of microlot classification is that smaller units allow greater precision in quality selection and higher premiums for exceptional quality. When a cooperative segregates its highest-scoring parcels — top 5% of quality from the annual cupping — into separate microlots, those parcels can be sold at prices reflecting their exceptional quality rather than being averaged into the cooperative's general export grade. This direct premium for exceptional quality provides an economic incentive for the cooperative to invest in quality improvement, which the standard commodity pricing model does not. Microlot premiums in 2026 specialty markets can reach 3–5× commodity pricing for truly exceptional lots — a meaningful income difference for smallholder farmers.
Going deeper
From the consumer side, microlot coffees offer verifiable traceability that standard commodity blends cannot approach. When a roaster lists 'Finca Las Nubes, Huehuetenango, Guatemala, Lot 47, Harvest November 2025, Processed by Natural Method, Score 88 SCA points,' each element is verifiable in principle — the farm exists, the lot number corresponds to a specific processing record, the harvest date is documented. This traceability has value beyond marketing: it creates accountability through the supply chain and enables the kind of feedback loop (consumer quality response → roaster buying decision → farm practice) that drives quality improvement at origin. The microlot system, at its best, is a quality information infrastructure as much as a pricing mechanism.