Coffearium Brewing Control Chart

Coffearium's chart connects a refractometer reading to the recipe that produced it. Enter coffee dose, beverage mass or brew water and TDS, and the tool calculates extraction yield, strength and ratio before placing the result against classic Golden Cup and newer sensory reference bands. Drip and immersion modes account for different retained liquid assumptions, while a separate espresso calculation avoids forcing concentrated shots onto filter-coffee axes. A PDF can preserve the inputs and result, and the page says nothing is stored online.

The chart measures concentration and mass balance, not deliciousness. A refractometer needs clean sampling and calibration; suspended fines, crema or an incorrect beverage weight can move the result. Two cups at the same yield may taste very different because of extraction uniformity and raw material. Target boxes are useful comparison zones rather than pass/fail standards for every roast. This tool is strongest when a brewer combines a trustworthy measurement with notes from the cup, then uses the number to test a specific hypothesis.