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Garetz calculation off? 5 minute addition shows as 0 IBUs

gozer

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Feb 12, 2013
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for a 10AA hop Garetz is showing 0 IBUs for a 5 min boil addition. And it's 0 all the way up to 11 where it changes to 12.9!

Changing to steep/whirlpool also gives a non-0 value.
 
I have attached a chart demonstrating the IBU contributions based upon the three most popular models.  Note that the Garetz model does not calculate any contributions below 10 minutes.
 

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    IBU models.gif
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You can read more about the comparison of the three major IBU models here: http://rhbc.co/wiki/calculating-ibus
 
Thanks for the info! Good to know about Garetz... doesn't make a bit of sense, but good to know.

Seems silly that if I take the exact same addition and change it from 5m boil to 5m "steep/whirlpool" it goes from 0 to 15 IBUs.

Guess I'll stick with Tinseth.
 
The IBU contribution calculation is not a part of the original Garetz model (or any of the models), but added on based upon information based upon current studies. 
 
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