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Quick hopbill recalc (the woes of no sparge)

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ebstauffer

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I've been making batch after batch of Biermunchers Centennial Blonde in order to figure out No Sparge mashing. I'm using this calculator from Ken Schwarz to adapt my recipes. And, well, it's not been easy. For example, following his formula for Centennial Blonde I have gotten on two consecutive brews 1039 for my pre-boil gravity. I'm not one to get my knickers in a twist about efficiency and stuff like that, but I do like my hops to be in balance with the gravity/maltiness.

What I'm looking for is a quick calculator that will answer the question, "If this hop W is for this gravity X then you should multiply by Y if your pre-boil gravity is actually Z". I'd like to think it's a simple ratio like:

new hop mass = (recipe hop mass)(gravity a/gravity b)

I realize I'll need to do some estimating based on the length of the boil and established boil off rate. Maybe I'm hoping for something that doesnt exist because it cant.

Any ideas or pointers?
 
Ray Daniels describes a "Gravity Unit to Bitterness Unit" ratio (GU/BU) in his book, "Designing Great Beers." Is that what you had in mind?
 
Im embarrassed to say I have that book in my brewing library. That's exactly what Im referring to. I'll take a look. Thanks!
 

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