Extraction 101 (The 1:16 Ratio)
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In the Lab, we move away from scoops and tablespoons. These are volumetric measurements that vary wildly depending on the density of the roast. To achieve a repeatable, high-quality result, we use mass-based ratios.
The Global Baseline: 1:16
The 1:16 ratio is our starting point for standard drip, pour-over, and French Press. This means for every 1 gram of coffee, we use 16 grams of water.
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The Goal: We want to hit the Sweet Spot of extraction. Coffee beans are roughly 30% soluble, but we only want to pull out about 18–22% of that material. The 1:16 ratio provides enough water to dissolve the sugars and oils without over-extracting the bitter, woody fibers.
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The 10oz Mug Math: Most standard mugs are roughly 10oz (approx. 300g of water).
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300/16 = 18.75
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Bean Man's Ratio: Use 19g of coffee for a 10oz (300g) brew.
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The Physics of the Solvent: Percolation vs. Immersion
While 1:16 is the standard, the way water moves through your coffee changes how efficient that water is as a solvent.
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Percolation (Pour-over/Drip): In these methods, you are constantly introducing fresh water. Fresh water is a hungry solvent; it has zero coffee solids in it, so it aggressively pulls flavor out as it passes through. Because the water is constantly being replaced, 1:16 is highly efficient.
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Immersion (French Press): Here, the coffee sits in the same water for the entire brew. As the minutes pass, the water becomes saturated with coffee solids. As the concentration rises, the water’s ability to "pull" more flavor out of the grounds decreases. The solvent becomes full.
Because immersion is a less efficient extraction process due to solvent saturation, many people prefer to tighten the ratio to 1:15 (approx. 20g of coffee for a 10oz mug).
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The Lab Observation: Adding more coffee provides more total surface area. This ensures that even as the water becomes saturated, it has extracted enough total mass to provide the heavy body and strength expected from an immersion brew.
Summary: Precision is the difference between a good cup and a perfect extraction. By understanding the relationship between your solvent (water) and your solute (coffee), you can dial in any brewer in your kitchen.