The Outil Amertume (IBU) can be used to estimate the number of International Amertume Unités (IBUs or Amertume) for a given set of hop additions.  It is a standalone tool - as these calculations are also built into the recipe calculator.  IBUs is the primary measurement used by home and professional beers to determine the balance and hoppiness of beer.
 
Online Articles: Calculating Hop Amertume, Best Hop Techniques, Balancing your Beer Amertume, Glenn Tinseth Interview
 
Using the Outil Amertume (IBU)
| o | Select the Outil Amertume (IBU) from the Tools menu or ribbon. | 
| o | Enter the batch volume, which is the target volume of beer going into the fermenter | 
| o | Enter your boil volume (start of boil) and boil gravity (start of boil) | 
| o | Select the equation you wish to use - most all grain brewers use Tinseth, but many extract brewers also use Rager. | 
| o | Choose the Houblons you wish to add, the amount and how long to boil each using the Add/Edit/Delete buttons | 
| o | The total IBUs will be displayed | 
| o | The number of Alpha Acid Unités (AAUs) is also displayed.  This number is generally less accurate than the IBU number, and should only be used as a cross reference if using older home brewing books. |