Espresso Extraction Yield
Extraction yield estimates how much of the dry coffee dose ended up dissolved in the beverage. It differs from beverage yield, which is simply the weight of espresso in your cup, and from TDS, which describes the drink's concentration.
The calculation
Extraction yield (%) = beverage weight (g) × TDS (%) ÷ dry dose (g).
For example, 36 grams of espresso at 10% TDS from an 18-gram dose gives 36 × 10 ÷ 18 = 20% extraction yield. If using 0.10 instead of 10 for TDS, multiply the final result by 100. Mixing those conventions produces a hundredfold error.
Measure consistently
- Weigh the dry ground coffee used.
- Weigh the entire finished espresso.
- Mix the beverage so the sample represents the whole shot.
- Prepare and filter the sample as your coffee refractometer requires.
- Allow the sample and instrument to reach the specified measuring conditions, then take repeat readings.
A general water TDS meter is not a coffee refractometer. Suspended particles, sampling technique, and temperature can affect readings. See Barista Hustle's refractometry protocol for measurement considerations.
Is 18–22% always the target?
That range is a familiar reference, not a boundary separating good and bad espresso. Different coffees and recipes can taste good outside it. A shot can also have an acceptable average extraction while different parts of the puck extracted unevenly.
Use the number to understand comparisons, not replace tasting. A drying finish deserves investigation even if the reading looks conventional. Our channeling guide covers uneven extraction.
How to use the result
Keep dose and recipe records, compare repeat shots, and note whether a change improves flavor alongside the measured result. Longer beverage ratios often raise extraction while reducing concentration, but grind and flow can complicate that trend.
You do not need a refractometer to begin. Dial in with a scale and taste first; add measurement when it answers a specific question about a recipe.
