Input lever
Recipe & Mass Balance
Wheel face
Coffee dose
The mass of coffee used in the recipe.
AeroPress Wheel Variable
Brew loss
Recipe & Mass Balance · Calculated metric
The difference between brew water in and beverage out before dilution.
Calculated metric
Recipe & Mass Balance
Detail panel
Measurement-friendly
Competition practice
Inferred
Definition
Brew loss captures retained liquid plus handling loss before the finish-and-service phase begins.
Why It Matters
It is useful when recipes look similar on paper but deliver different beverage masses.
This is a calculated metric built from other measurements rather than a direct brew observation.
Page Context
Brew loss is part of the Brew Supply AeroPress Wheel and helps brewers describe the difference between brew water in and beverage out before dilution.
Related variables
Input lever
Recipe & Mass Balance
Detail panel
Dose into grinder
The mass of whole-bean coffee placed into the grinder.
Input lever
Recipe & Mass Balance
Detail panel
Dose into brewer
The actual ground coffee mass placed in the AeroPress.
Input lever
Recipe & Mass Balance
Wheel face
Brew water mass
The total water mass that contacts the coffee during extraction.
Input lever
Recipe & Mass Balance
Wheel face
Stage water masses
How brew water is split across recipe phases.
Input lever
Recipe & Mass Balance
Detail panel
Bloom water
The initial water used for wetting and gas release.
Affected outcomes
Measured metric
Cup Outcome
Wheel face
Beverage TDS
Measured total dissolved solids in the served beverage.
Calculated metric
Cup Outcome
Wheel face
Extraction Yield
Calculated percentage of coffee mass extracted.
Measured metric
Cup Outcome
Wheel face
Beverage Yield
The liquid beverage mass collected or served.
Cup outcome
Cup Outcome
Wheel face
Aroma
The smell of the brewed coffee.