Chapter 11

Wort Boiling

Calculations

Hop Additions

The bitterness of a beer is expressed in IBUs (International Bitterness Units), which is a measure of iso-alpha acid in a beer, measured in mg/l. To calculate the amount of hops needed, the brewer must know several factors: bitterness units for the beer style (IBUs), batch size, and production loss, utilization yield of alpha-acids, and types and proportions of hop products required.

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