How does a coffee cupping work?
A cupping follows the SCA protocol: 8.25 g of coarsely ground coffee per bowl, covered with 150 ml of water at 93 °C, steeped for four minutes without stirring. Tasters break the crust with a spoon while inhaling the rising aromas, skim the surface, then slurp the cooled coffee to score ten attributes on a 100-point scale.
Cupping is the worldwide reference method for evaluating coffee objectively, from the origin farm right through to the roaster's cupping room. Its protocol was formalised by the Specialty Coffee Association (SCA) and is so tightly standardised that two certified Q-graders — one in Brazil, the other in Antwerp — will produce comparable scores on the same sample. The gear is intentionally minimal: identical 200-250 ml bowls, deep soup spoons, a glass of hot water for rinsing, and a grinder set coarser than filter — calibrated so that 70 to 75 % of particles pass through a US 20 sieve.
The ratio is strict and non-negotiable: 8.25 grams of coffee for 150 ml of water, or 1:18.2. Water sits between 92 and 94 °C, mineralised to roughly 150 ppm TDS. Before pouring, the taster assesses fragrance — the aromatics of the dry grounds — by leaning over the bowl for about fifteen seconds. Water is then poured in one confident stream to saturate the bed evenly. A crust forms on top: oils, gases and particles rise and trap the aromatic compounds beneath a natural brown foam lid.
After exactly four minutes, the central ritual begins: breaking the crust. The taster pushes the back of the spoon through the bowl in three gentle strokes, nose just five centimetres above the surface to catch the escaping vapours — the wet aroma, often the most expressive moment of the session. Residual grounds and foam are then skimmed off using two spoons. The coffee rests until it drops to around 70 °C, then the taster loudly slurps it off the spoon — the famous slurp — which atomises the liquid as a fine mist across the palate so retronasal olfaction can work in full.
Scoring covers ten attributes, each on a 6-to-10 scale graded in quarter-points: fragrance/aroma, flavour, aftertaste, acidity, body, balance, uniformity, clean cup, sweetness and overall. A total of 80 or higher earns the specialty-grade label.
The chronological steps of an SCA cupping
| Time | Action | What is assessed |
|---|---|---|
| T-1 min | Weigh 8.25 g of coarsely ground coffee per bowl | Grind uniformity, dry fragrance |
| T-0 | Pour 150 ml of 93 °C water in one stream | Full saturation, crust formation |
| T+4 min | Break the crust with three gentle strokes | Wet aroma, vapours 5 cm above the bowl |
| T+5 min | Skim foam and grounds with two spoons | Sensory clarity before tasting |
| T+8 min | First slurp, coffee at ~70 °C | Flavour, acidity, body, sweetness |
| T+12 min | Second pass, coffee lukewarm | Balance, aftertaste, defects |
| T+20 min | Final pass, coffee at room temperature | Overall, final score out of 100 |
The Cupping Table: Coffee's Most Democratic Ritual
Cupping is coffee's great equalizer. Whether you're at a $200-per-bag microlot session in Copenhagen or a co-op tasting in Sidama, the protocol is essentially the same: coarsely ground coffee steeped in near-boiling water for four minutes, crust broken at minute four, then tasted with a loud, aspirating slurp designed to aerosolize the liquid across the full palate. The SCA standardized this protocol in 1999 specifically to create a universal evaluation language — a way for buyers in Brussels and farmers in Huila to score the same lot and arrive at comparable numbers. Before standardization, defects that a Scandinavian importer would reject were often invisible to a trader working from a different sensory framework.
The drama of a professional cupping session is easy to underestimate. Top Q Graders can evaluate 40 to 50 cups in a single three-hour session without their palates fatiguing significantly — a feat of trained attention rather than innate talent. They're scoring ten attributes simultaneously: fragrance, aroma, flavor, aftertaste, acidity, body, balance, uniformity, clean cup, and overall. The uniformity and clean cup categories — each scored across five identically prepared cups of the same lot — catch issues that single-sample brewing would miss: a batch contaminated in one bag, a processing inconsistency that shows up in 20% of the cups, a fermentation defect that varies by cherry density. This redundancy is why cupping at scale remains irreplaceable even as technology pushes into flavor prediction via machine learning.
Practical Recommendations
Starting a home cupping practice requires less equipment than you'd think. Two tablespoons of coarsely ground coffee per cup, 200ml of filtered water at 93°C, a standard soup spoon for slurping, and a notebook. Start with three origins side by side — one Ethiopian washed, one Colombian washed, one Brazilian natural — and score just three things: overall fragrance before water is added, flavor at the first sip, and finish at 10 minutes. You don't need the full SCA form to begin building comparative intuition. The most important discipline is consistency: same grind size, same water weight, same waiting time. Consistency makes comparison meaningful; without it, you're just drinking coffee in succession rather than cupping.