What is basic barista vocabulary?

Barista vocabulary is a precise technical lexicon centred on espresso extraction. Three terms sit at its core: dose (mass of ground coffee loaded into the portafilter, in grams), yield (mass of the liquid in the cup) and channeling (the extraction fault where water carves a preferential path). Together they describe — and diagnose — almost any shot in a handful of words.

Dose (sometimes called 'input') is the mass of ground coffee placed in the portafilter basket, weighed to the gram on a precision scale. Modern baskets are dosed at 18-20 g in a double basket and 7-10 g in a single, though most specialty baristas standardise on double baskets. The dose has to be consistent shot to shot — a 0.2 g swing can already change puck resistance and shift the extraction time.

Yield (or 'output') is the mass of liquid espresso in the cup, also weighed. The dose-to-yield ratio defines the shot style: 1:1 to 1:1.5 is a ristretto — short and dense; 1:2 to 1:2.5 is a classic espresso (say, 18 g in, 36 g out); 1:3 to 1:5 is a lungo or a longer German-style shot. Each ratio has its own balance of acidity, body and sweetness. Filter methods use much wider ratios: 1:15 to 1:17 for a V60, 1:13 to 1:15 for a Chemex.

Channeling is an extraction fault in which pressurised water finds a preferential path through the puck, bypassing parts of the coffee bed instead of flowing evenly. The result is a cup that is simultaneously under-extracted (cool, sour, vegetal, salty-astringent notes from the untouched zones) and over-extracted (bitter, dry-astringent notes from the blown-out channel). Typical causes: uneven tamping, poor grind distribution (WDT, distribution tool), a worn basket, an under-dose or inconsistent tamping pressure. Around these three terms sits a wider lexicon: TDS (Total Dissolved Solids, measured on a refractometer — roughly 1.2-1.45 % for filter and 8-12 % for espresso), extraction yield (EY, percentage of mass dissolved out of the ground coffee, SCA target 18-22 %), grind size, puck, tamper, WDT (Weiss Distribution Technique), pre-infusion, flow profiling, baskets (VST, IMS, OEM). Add to that the sensory vocabulary: body, acidity, sweetness, balance, clean cup.

In Belgium, this is now the common language of specialty roasters and cafés in Brussels, Ghent, Antwerp and Liège, and of baristas trained on the SCA track. In Walloon Brabant, places like 20hVin in La Hulpe and La Cave du Lac in Genval rely on the same lexicon when talking to guests about the coffee in the cup — mirroring the wine vocabulary of grape, vintage, ageing.

Barista vocabulary — essential terms