tags: [] - coffee/green-beans - coffee/green-beans/grading - coffee/quality aliases: - Coffee grading procedure - Green coffee sampling - Coffee grading documentation

Green Coffee Grading Process¶

Tags: #coffee/green-beans #coffee/green-beans/grading #coffee/quality Aliases: Coffee grading procedure, Green coffee sampling, Coffee grading documentation Related: Green Coffee Grading | Green Coffee Defects | Green Coffee Grading Methods | Quality Control MOC Status: ✅ Complete

Overview¶

Accurate green coffee grading proceeds through five sequential stages: sample collection, physical inspection, sample roasting, sensory evaluation, and documentation. Each step builds toward a final classification combining physical grade and cup quality score, as governed by the SCA cupping and grading standards and further detailed in Green Coffee Grading.

1. Sample Collection¶

Grading is only as reliable as the sample. A non-representative sample produces a misleading grade.

Sample size: A minimum of 1 kg for thorough assessment; 350 g is used for defect counting; additional coffee is reserved for moisture testing, sample roasting, and cupping.

Sampling method: Random samples are drawn from multiple points within the lot, proportional to lot size, and homogenised before grading. Chain-of-custody documentation should be sealed, labelled, traceable to the lot, and tamper-evident.

2. Physical Inspection¶

Visual assessment: 1. Sample is spread on a white surface or grading table 2. Colour uniformity is assessed 3. Obvious defects are identified (full blacks, foreign matter, etc.) 4. Overall appearance and processing quality indicators are noted

Screen sizing (where applicable): 1. Sample is weighed 2. Passed through stacked screens in descending size order 3. Retention at each screen is weighed 4. Size distribution is calculated 5. Classified by largest percentage retention

Defect counting: 1. A 350 g sample is spread on a grading surface 2. Hand-sorted, with each defect identified by category 3. Category 1 and Category 2 equivalents applied (see Green Coffee Defects) 4. Total full defects calculated 5. Grade assigned based on defect count against origin standard

Moisture testing: 1. Moisture meter used (capacitance or infrared) 2. Multiple readings taken and averaged 3. Target: 10–12% moisture for most Arabica 4. Water activity measured for storage stability assessment (target: below 0.70)

3. Sample Roasting¶

Coffee is roasted to a standardised profile before cupping to evaluate origin character rather than roast character.

Protocol: Standardised sample roaster; light-medium roast; Agtron 58–60 (whole bean); 8–12 minute roast time; cooled quickly; rested 8–24 hours before cupping.

The sample roast reveals cup quality, identifies roast defects, and assesses development — results that combine with the physical grade to determine final classification.

4. Sensory Evaluation¶

SCA cupping process: 1. Coffee ground to medium-coarse 2. Minimum five cups prepared 3. 93 °C water added 4. Steeped for 4 minutes 5. Crust broken; aroma evaluated 6. Foam skimmed 7. Tasted as coffee cools 8. Scored on the SCA cupping form 9. Final score calculated

Attributes evaluated: Fragrance/aroma, flavour, aftertaste, acidity, body, balance, uniformity (across five cups), clean cup (across five cups), sweetness (across five cups), overall impression.

Grade determination: Physical grade combined with cup score yields the final classification. For example: Ethiopian Grade 1 (physical) + 85-point cup score = Grade 1, Specialty, Excellent quality.

5. Documentation¶

A grading certificate records: lot identification, sample date, physical grade (size, defects), cup score, moisture content, water activity, grader identification, and date of evaluation.

Traceability records capture: farm or washing station, processing method, harvest date, lot number, altitude, and variety. Traceability documentation increasingly commands a market premium in addition to the quality premium.

Key Facts¶

The standard defect-counting sample is 350 g, hand-sorted on a white surface
Target moisture content for Arabica green coffee is 10–12%; water activity should be below 0.70 for storage stability
Sample roasting protocol: Agtron 58–60, 8–12 minutes, rested 8–24 hours before cupping
The SCA cupping form evaluates ten attributes across a minimum of five cups
A grading certificate combines physical grade and cup score and links the lot to full traceability documentation

References¶

Specialty Coffee Association — Green Coffee Grading and Classification Standards

Changelog¶

Date	Change
2026-05-03	Compliance review: added frontmatter, metadata block, all required sections; converted procedural imperatives to third-person passive descriptions; fixed path-prefixed wikilinks; replaced non-coffee tags

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