# Understanding Attenuation

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Attenuation refers to the percentage of starting [[extract]] that has been converted by the fermentation process: | Attenuation refers to the percentage of starting [[extract]] that has been converted by the fermentation process: | ||

− | Attenuation = 100 % * (starting extract - current extract) / (starting extract) | + | <tt>Attenuation = 100 % * (starting extract - current extract) / (starting extract)</tt> |

This formula works with extract given in weight percentages and degree Plato. Since, at least in the wort and beer gravities that most brewers work with, there is an almost linear relationship between (specific gravity - 1) and extract percentages. This formula can be changed to: | This formula works with extract given in weight percentages and degree Plato. Since, at least in the wort and beer gravities that most brewers work with, there is an almost linear relationship between (specific gravity - 1) and extract percentages. This formula can be changed to: | ||

− | Attenuation = 100 % * (starting gravity - current gravity) / (starting gravity - 1) | + | <tt>Attenuation = 100 % * (starting gravity - current gravity) / (starting gravity - 1)</tt> |

to work for brewers who measure extract as specific gravity. | to work for brewers who measure extract as specific gravity. |

## Revision as of 05:03, 26 November 2007

*work in progress*

--Kaiser 22:51, 25 November 2007 (CST)

Attenuation refers to the percentage of starting extract that has been converted by the fermentation process:

`Attenuation = 100 % * (starting extract - current extract) / (starting extract)`

This formula works with extract given in weight percentages and degree Plato. Since, at least in the wort and beer gravities that most brewers work with, there is an almost linear relationship between (specific gravity - 1) and extract percentages. This formula can be changed to:

`Attenuation = 100 % * (starting gravity - current gravity) / (starting gravity - 1)`

to work for brewers who measure extract as specific gravity.