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Old 01-17-2011, 11:28 PM   #1
ThereThere
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Default IBU's way off?

So my first brew was a Simcoe IPA kit from Midwest Supplies: http://www.midwestsupplies.com/simcoe-select-ipa.html

It boasts 67.5 IBU. I crunched the numbers in hopville (I even changed the AA) and ended up at only 43.9. What's the deal here?

http://hopville.com/recipe/482713/am...pes/simcoe-ipa

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Old 01-17-2011, 11:36 PM   #2
Daddymem
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I cloned your recipe and fiddled with which formula is used to calculate the IBUs. The Rager formula on that recipe gets 66.5 IBU and the "Hopville" formula gets 76. You'd have to ask Midwest how they calculated their IBUs.

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Old 01-17-2011, 11:45 PM   #3
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There are a few different formulas to calculate IBU's Rager formula, tinseth, hopville, etc. Each different formula gives you a different reading. I typically use tinseth when i calculate my recipes.

Also take a look at the water volume they suggest in the recipe as more or less water will also change the Ibus of a recipe.

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Old 01-17-2011, 11:49 PM   #4
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Quote:
Originally Posted by wcarter1227 View Post
There are a few different formulas to calculate IBU's Rager formula, tinseth, hopville, etc. Each different formula gives you a different reading. I typically use tinseth when i calculate my recipes.

Also take a look at the water volume they suggest in the recipe as more or less water will also change the Ibus of a recipe.
I didn't realize there were different formulas. Tinseth's gives the 67.5. Is there a "best" formula?
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Old 01-17-2011, 11:52 PM   #5
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Quote:
Originally Posted by ThereThere View Post
I didn't realize there were different formulas. Tinseth's gives the 67.5. Is there a "best" formula?
I typically use tinseth's as I have noticed a lot of recipes use it, however I am not sure which would be the "best" formula. Maybe someone else can chime in here.

Kit looks nice by the way
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Primary 3: Sam Adams Holiday Porter Clone
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DryHopped Cream of 3 Crops
http://hopville.com/brewer/wcarter1227

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