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Coffee Extraction Calculator

Find your extraction yield and strength for a dialed-in brew.

How to use

  1. Enter your values in the fields above.
  2. Press Calculate to see your result instantly.
  3. Use the Share button to copy a link to your result.

About this calculator

Coffee extraction yield measures what percentage of the ground coffee's mass actually dissolved into your cup, calculated from Total Dissolved Solids (TDS, measured with a refractometer): Extraction % = (TDS × brewed weight) / dose weight. The widely used “Coffee Brewing Control Chart” from the SCA (Specialty Coffee Association) puts the ideal extraction window at roughly 18-22%, with strength (TDS) typically targeted around 1.15-1.35% for filter coffee.

Under-extraction (below 18%) tastes sour and underdeveloped because desirable acids and sugars haven't fully dissolved yet, while over-extraction (above 22%) pulls out bitter, astringent compounds from the coffee grounds — baristas and home brewers adjust grind size, brew time, water temperature and dose-to-water ratio to steer both numbers into the target range.

This calculator takes your TDS reading along with dose and brewed weight and returns your extraction yield and brew strength, so you can dial in a specific, repeatable cup.

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