Coffee Extraction Yield Calculator
Dialing in clean pour overs and balanced espresso requires measurable data. Use our interactive Coffee Extraction Yield Calculator to turn refractometer readings into precise extraction percentages, verify your brew ratio, and hit the target extraction zone every session.
What is Coffee Extraction Yield (EY) & TDS?
Coffee extraction yield is the percentage of dry coffee grounds by weight dissolved into liquid coffee during brewing. Calculated using cup mass, dose weight, and Total Dissolved Solids (TDS), it reveals whether your brew pulled the correct balance of flavors without under-extracting or over-extracting.
While Total Dissolved Solids (TDS) tells you beverage concentration (how strong or watery the cup feels), extraction yield percentage measures brewing efficiency (how much usable coffee mass you dissolved from the beans).
How to Calculate Extraction Yield Coffee: The Formula
To convert a digital refractometer reading into an exact extraction yield, use this standard mass-balance formula:
Extraction Yield (%) = (Beverage Mass (g) × TDS (%)) / Dose Weight (g)Worked Example: If you brew a pour over using a 20g dose weight of coffee grounds and finish with a 300g beverage mass / yield weight at a 1.38% refractometer reading:
Step 1: 300g (Yield) × 1.38% (TDS) = 4.14g of dissolved coffee solids
Step 2: (4.14g / 20g Dose) × 100 = 20.70% Extraction Yield
If you only tracked the total water poured, estimate your final cup mass by subtracting the liquid retained by grounds (typically 2.1g of water per 1g of dry coffee):
What TDS Should My Coffee Be? (Target Extraction Matrix)
The Specialty Coffee Association (SCA) specifies an ideal extraction yield percentage for pour over coffeeand drip methods within the 18% to 22% "golden cup" range. Here is how targets break down by brew method:
| Brew Method | Target TDS (Strength) | Ideal Extraction Yield (EY) | Recommended Brew Ratio |
|---|---|---|---|
| Pour Over / Drip | 1.15% – 1.45% | 18.0% – 22.0% | 1:15 to 1:17 (60g/L to 66g/L) |
| Immersion (French Press / AeroPress) | 1.25% – 1.50% | 19.0% – 22.0% | 1:14 to 1:16 |
| Standard Espresso | 8.0% – 11.0% | 18.0% – 21.0% | 1:2.0 (e.g., 18g in / 36g out) |
| Modern High-Extraction Espresso | 8.5% – 12.0% | 21.0% – 24.0% | 1:2.5 to 1:3.0 (e.g., 18g in / 45–54g out) |
Why is My Coffee Under-Extracted or Over-Extracted?
Use our coffee TDS to extraction percentage calculator to pair your numeric yield with what you taste on the cupping table:
Under-Extracted (< 18.0% EY)
Sensory Profile: Sharp, puckering sourness, grassy tones, thin body, and a short salty finish.
Fix: Grind finer, raise brew water temperature to 200°F–208°F (93°C–98°C), extend brew time, or increase agitation during the bloom.
Balanced Extraction (18.0% – 22.0% Golden Cup Zone)
Sensory Profile: Ripe sweetness, transparent origin notes, smooth body, balanced acidity, and a long, clean finish.
Over-Extracted (> 22.0% EY)
Sensory Profile: Harsh bitterness, dry astringency (mouth-drying sensation), roasty ash, or cardboard notes.
Fix: Grind coarser, drop water temperature slightly, shorten contact time, or use a slightly shorter brew ratio.
Channeling Anomaly (Low Yield with Astringent Finish)
Cause: Water cut fast paths through cracks in the coffee bed, over-extracting narrow channels while leaving surrounding grounds dry.
Fix: Improve puck prep with a WDT needle tool, tamp flat, eliminate pour bypass, and check grinder burrs for alignment issues.
Why Beverage Mass Matters More Than Total Brew Water
A common brewing mistake is calculating extraction yield using total water poured from the kettle instead of the beverage mass in your server.
Dry grounds trap water in the brewer (liquid retained by grounds). Dissolved compounds trapped inside that wet slurry never enter your cup. Because your optical refractometer measures the liquid in your glass, multiplying by the final beverage mass / yield weight gives the true mathematical extraction yield.
Frequently Asked Questions
What is a good extraction yield for coffee?
A good extraction yield for specialty coffee is between 18.0% and 22.0%, commonly known as the golden cup range. Yields below 18% taste sour and grassy from under-extraction, while yields above 22% taste bitter and astringent from over-extraction.
How do you calculate coffee extraction percentage?
To calculate coffee extraction percentage, multiply your final beverage mass (in grams) by the refractometer TDS percentage, then divide by your dry coffee dose weight (in grams). For example: (300g yield × 1.35% TDS) / 20g dose = 20.25% extraction yield.
What does TDS mean in coffee?
TDS stands for Total Dissolved Solids. It measures the concentration of soluble coffee material dissolved in water, expressed as a percentage. Filter coffee typically targets 1.15% to 1.45% TDS, while espresso ranges from 8.0% to 12.0% TDS.
Why is my coffee under-extracted or over-extracted?
Under-extraction occurs when water moves too quickly or cannot pull enough soluble solids from the grounds, usually due to a coarse grind, low water temperature, or short brew time. Over-extraction occurs when excessive water contact, fine grinds, or channel pathways strip bitter, woody plant fibers out of the bed.
Coffee Extraction & TDS Solver
Extraction Yield (EY)
* Extraction calculations follow Specialty Coffee Association (SCA) Golden Cup standards. Measured TDS readings may vary depending on sample temperature, filtration, and refractometer calibration.
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