Espresso

Extraction

Extraction is the process of water dissolving soluble compounds from ground coffee during brewing. In espresso, extraction is controlled by grind size, dose, water temperature, time, and pressure. Under-extracted shots taste sour; over-extracted shots taste bitter.

Extraction follows a predictable sequence: acids and salts dissolve first (early in the shot, contributing brightness and body), sugars dissolve next (mid-shot, contributing sweetness), and bitter compounds dissolve last (late shot, contributing dryness and astringency). The goal is to stop the shot at peak sweetness, before bitter dominance.

Extraction yield is measured as a percentage of soluble coffee mass extracted from the grounds — the SCA's 'gold cup' standard is 18–22% for filter coffee. Espresso typically targets around 19–22% with TDS (total dissolved solids) of 8–12%, though specialty cafés vary widely based on bean and house style.

The four variables baristas control to manage extraction: grind size (finer = more extraction, coarser = less), dose (higher dose = lower extraction per gram), time (longer = more extraction), and temperature (higher = more extraction). Changing one without compensating the others is the most common cause of off-taste shots.

Related terms

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Drinks

Espresso

Espresso is a small, concentrated coffee beverage made by forcing about 92–94°C water through finely-ground, tamped coffee at 9 bars of pressure for 25–32 seconds.

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Espresso

Dial-in

Dial-in is the process of adjusting an espresso grinder until shots hit your target dose, yield, and time — typically 18g in, 36g out, in 25–32 seconds.

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Espresso

Channeling

Channeling is when water flows unevenly through the coffee puck during espresso extraction, creating channels through the grounds.

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Espresso

Dose (coffee)

Dose is the weight of ground coffee used in a single espresso shot, measured in grams.

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Espresso

Yield (espresso)

Yield is the weight of espresso liquid produced from a shot, measured in grams.

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FAQ

Frequently asked questions

How do I know if my espresso is properly extracted?
By taste. Properly extracted espresso tastes balanced: sweet, with bright acidity and pleasant body. Under-extracted = sour, sharp, thin. Over-extracted = bitter, dry, astringent. Time + yield are proxies; taste is the verdict.
What causes uneven extraction?
Channeling (water finding the path of least resistance through the puck), uneven tamping, dirty baskets, or beans that are too fresh or too stale. Each one prevents water from contacting all the grounds equally.
What's the ideal extraction percentage for espresso?
Roughly 19–22% extraction yield with 8–12% TDS, though specialty cafés often target the lower end for clarity. The exact target depends on roast, bean, and house style — taste rules over numbers.

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