Pour-Over Extraction Science & Brew Ratios: Dialing In V60, Kalita & Origami
Mastering 1:15 to 1:17 ratios, water temperature profiling (92°C–98°C), micron grind distribution, and bypass brewing.
Executive Summary & Key Takeaways
- The Specialty Coffee Gold Standard: Extraction Yield of 19%–22% at 1.25%–1.40% Total Dissolved Solids (TDS).
- Brew ratio dictates extraction dynamic: 1:15 provides intense syrupy body, 1:16.5 gives balanced sweetness, and 1:17.5 maximizes floral cultivar separation in ultra-light roasts.
- Brew temperature should match roast density: 96°C–98°C for dense ultra-light washed lots (1,900m+); 92°C–94°C for natural/anaerobic fruit ferments.
- The 3x dose bloom (45g water for 15g coffee) for 45 seconds ensures 100% capillary bed saturation before pulse pours.
Pour-over brewing is the ultimate expression of single-origin coffee transparency. Dialing in a master brew requires balancing brew ratio, water temperature, dripper geometry, grind particle distribution, and pour agitation. By understanding the mathematical relationship between Total Dissolved Solids (TDS) and Extraction Yield (EY), you can tailor every brew to the roast profile and elevation of your beans.
⚖️ Pour-Over Extraction Ratios & Yield Targets
| Brew Ratio | Target TDS | Extraction Yield | Recommended Coffee Style | Sensory Cup Profile |
|---|---|---|---|---|
| 1:15 (20g coffee / 300g water) | 1.40% – 1.50% | 19.0% – 20.5% | Full-bodied Naturals, Aeropress, Iced Filter, Milk pairing | Dense mouthfeel, dark cherry sweetness, intense finish |
| 1:16 (16g coffee / 256g water) | 1.32% – 1.40% | 19.5% – 21.0% | Honey-processed & Anaerobic Micro-Lots (Huila / Tarrazú) | Juicy stone fruit, balanced malic acidity, caramel sweetness |
| 1:16.5 (15g coffee / 248g water) | 1.28% – 1.35% | 20.0% – 21.5% | Classic High-Altitude Washed (1,700m–1,950m) | Superb sweetness, clean finish, crisp green apple acidity |
| 1:17.5 (15g coffee / 262g water) | 1.20% – 1.28% | 20.5% – 22.0% | Ultra-Light Scandinavian & Japanese Roasts (Wendelboe / Fuglen) | Tea-like transparency, bergamot perfume, jasmine, lingering sweetness |
1. The Mathematics of Coffee Extraction Yield (EY)
Extraction Yield measures the exact percentage of the dry coffee bean mass dissolved into the brewed cup. The formula is:
$$\text{Extraction Yield (\%)} = \frac{\text{Brewed Coffee Mass (g)} \times \text{TDS (\%)}}{\text{Dry Coffee Dose (g)}}$$
- Under-Extraction (<18% EY): Only rapidly soluble organic acids and salts are dissolved. Results in a grassy, sharply sour, hollow cup lacking sweetness.
- Optimum Extraction (19%–22% EY): Sugars, malic/citric acids, and aromatic lipids dissolve in harmony. Results in sweet, complex fruit notes, pristine floral finish, and rich mouthfeel.
- Over-Extraction (>22% EY): Bitter, dry plant tannins, astringent polyphenols, and woody fibers dissolve into the cup, creating an astringent, dry mouthfeel.
2. Step-by-Step 3-Pour Dialing Protocol
Follow this competition-tested recipe for a 15g coffee / 250g water brew:
- Pre-Rinse & Pre-Heat: Rinse the paper filter with 200ml of boiling water to remove wood pulp taste and preheat the brewing vessel. Discard rinse water.
- Dose & Distribution: Add 15.0g of coffee ground at 650–750 microns. Create a slight shallow well in the center of the bed.
- Phase 1 (Bloom: 0:00 – 0:45): Pour 45g of water at 96°C–98°C. Give the dripper one gentle swirl to ensure 100% bed saturation. Allow CO2 to off-gas for 45 seconds.
- Phase 2 (Main Extraction: 0:45 – 1:30): Pour spiraling outward until scale reads 160g. Pour smoothly at ~5g/sec.
- Phase 3 (Finishing Drawdown: 1:30 – 2:15): Pour center stream until scale reads 250g. Give one gentle final tap or swirl to settle an even, flat coffee bed.
- Drawdown Completion: Target total drawdown is 2:45 to 3:15.
3. Bypass Brewing for Ultra-High Clarity
Bypass brewing involves extracting coffee at a tighter ratio (e.g. 1:14 with 15g coffee and 210g water) to avoid extracting bitter late-stage astringents, then stirring 40g of hot brew water directly into the server. This yields a clean, vibrant 1:16.7 cup with zero astringency.
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Recommended Partner Roasters
Experience peak extraction science with lots sourced and roasted by our partner artisans.
Tokyo Craft Legend
Kissa Fuglen Roastery
Cup of Excellence 91.5 pts
Finca El Mirador Micro-Lot
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