Hop Calculations

There are two different methods used to calculate hop bitterness. The default IBU calculation uses the Rager method, from Norm Pyle's Hops FAQ. The other method is the Tinseth method, from Glen Tinseth's Hop Page. To change to the Tinseth method, open up the Configure QBrew... dialog from the Options menu and check the Use Tinseth Hop Calculation box. The utilization table for the Rager method can be edited by changing the appropriate area of the calcdb file.

Please see the above links for details on these formulae, as they can be a bit complex.