Education
A Guide to Coffee Quality Assessment and Q-Grading
Understanding how specialty coffee is evaluated using SCA protocols and what the Q-grading system means for buyers and roasters worldwide.
A Guide to Coffee Quality Assessment and Q-Grading
In the specialty coffee industry, quality isn't subjective—it's measurable. The Specialty Coffee Association (SCA) cupping protocol and Q-grading system provide a universal language for evaluating coffee quality.
The SCA Cupping Protocol
The SCA developed standardized cupping procedures to ensure consistent evaluation worldwide. Key elements include:
Sample Preparation
- Medium roast (Agtron 58-63)
- Ground immediately before cupping
- 8.25g coffee per 150ml water
- Water at 200°F (93°C)
Evaluation Categories
Cuppers score coffee on a scale of 6-10 for each attribute:
- Fragrance/Aroma: Dry and wet smell
- Flavor: Overall taste impression
- Aftertaste: Lingering flavors
- Acidity: Brightness and quality
- Body: Weight and texture
- Balance: Harmony of elements
- Uniformity: Consistency across cups
- Clean Cup: Absence of defects
- Sweetness: Natural sweetness
- Overall: Subjective holistic score
The 100-Point Scale
Total scores determine quality classification:
- 90-100: Outstanding (exceptional lots)
- 85-89.99: Excellent (premium specialty)
- 80-84.99: Very Good (specialty grade)
- Below 80: Not specialty grade
At Treadville, all our coffees score 80+ with select lots reaching 90+.
Q-Grading Certification
Q-graders are licensed professionals trained by the Coffee Quality Institute (CQI). Certification requires:
- Passing 19 separate tests
- Demonstrating sensory skills
- Recertification every three years
Our team includes licensed Q-graders who ensure every lot meets our standards.
Why This Matters
For buyers, the Q-grading system provides:
- Transparency: Objective quality metrics
- Consistency: Reliable expectations
- Value alignment: Price reflects quality
- Communication: Shared vocabulary
Our Quality Process
At Treadville, quality assessment happens at multiple stages:
- Pre-harvest evaluation of cherry development
- Processing monitoring at wet and dry mills
- Pre-export cupping by our Q-graders
- Pre-shipment verification with detailed reports
Every bag we ship includes cupping scores and tasting notes, so you know exactly what you're receiving.
