Brew Calculator
Set your coffee in, in-cup amount, ratio, grind, and time. Watch Strength and Extraction move on the chart. Strength is how concentrated the cup is, Extraction is how much you pulled from the grounds.
In-cup amount. Higher yield can raise extraction but lower strength.
Water ÷ coffee. Higher yield usually raises extraction but lowers strength.
Dry coffee used. Increasing dose without adjusting yield usually lowers extraction.
Finer usually increases extraction and strength; coarser usually decreases them.
Longer increases extraction with diminishing returns. Use the stopwatch below to capture an exact time.
Right now you’re inside the sweet spot. If you want more punch, try a little finer or shorten the brew ratio; if you want gentler, do the opposite.
Tip: higher yield usually raises extraction but lowers strength. Finer or longer usually raises both.
“Balanced” targets the center of the green zone.
Espresso: keep yield fixed and adjust dose + grind together to keep strength steady while steering extraction.
V60/AeroPress/French Press: increase in-cup amount to raise extraction, but expect lower strength.
In general: finer or longer → higher extraction; higher yield → higher extraction but lower strength.
Recorder
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Sliders unlock after you record a brew time.