How Do You Measure Coffee Extraction Yield and Strength?

Coffee extraction yield is the share of a bean's mass dissolved into the cup. Only about 30 percent of a coffee bean is soluble, so that is the ceiling; the rest is insoluble lignocellulose that stays as spent grounds. The Golden Cup concept places the ideal yield between 18 and 22 percent, while strength describes concentration in the brewed liquid.

Falling inside that range does not make a coffee taste good, and falling outside it does not make one undrinkable. The Golden Cup experiments used limited participants and beans, so the coffee standard works as a reference ruler rather than a verdict. Measuring yield and concentration helps locate which brewing step caused an off cup.

Extraction yield and concentration are the two core quantitative indicators for assessing the state of a cup of coffee, and they form the foundation of the Golden Cup extraction theory. However, the Golden Cup range is not an absolute standard for good taste; it is more like an auxiliary ruler that helps us determine where a coffee's problems lie. In this article, Front Street will systematically explain the definitions of extraction yield and concentration, their calculation logic, and their practical applications, clarifying why a coffee that falls within the Golden Cup range is not necessarily delicious, why one outside the range is not necessarily undrinkable, and how to use these two values to find reasonable brewing adjustments.

However, nothing is absolute. The participants and coffee beans involved in the Golden Cup experiments have certain limitations, so this conclusion cannot prove that all coffees that people find delicious must necessarily fall within the Golden Cup concept.

Coffee that falls within the Golden Cup extraction range is not necessarily delicious; and coffee that falls outside the Golden Cup extraction range is not necessarily undrinkable.

But it can still serve as a reference tool to help us brew delicious coffee. After all, both extraction yield and concentration are quantified into specific values, allowing us to more intuitively judge the current "state" of the coffee. When we feel that the coffee we brewed is not ideal but cannot pinpoint which step the problem lies in, we can measure the extraction yield and concentration to verify our judgment and then find the appropriate direction for adjustment.

So today, Front Street will discuss how to measure coffee's extraction yield and concentration. Before that, let us briefly understand what coffee's extraction yield and concentration each refer to.

Coffee's extraction yield

Coffee extraction yield refers to the proportion of substances dissolved out of the coffee beans or coffee grounds.

Only 30% of a coffee bean is soluble substances, so the upper limit of a coffee bean's extraction yield is 30%. The remaining 70% is insoluble lignocellulose, which is the coffee grounds left in the container after brewing is finished.

In the Golden Cup extraction concept, the ideal extraction yield falls within the range of 18%–22%. When the extraction yield exceeds this range, because more substances are dissolved out, the coffee has a higher probability of showing pronounced bitterness and off-flavors; when the extraction yield is below this range, because fewer substances are dissolved out, the coffee may exhibit flavors of sharp acidity, grassiness, and other signs of underextraction (not absolute) . Coffee's concentration

Coffee concentration refers to the proportion of brewed coffee substances in the coffee liquid. The higher the concentration, the larger the proportion of coffee substances in the coffee liquid, and vice versa.

The above content is compiled by CoffeeHunters, a coffee news website.