uwmgdman
Well-Known Member
I know how to calculate IBUs no problem. My question is what do you do if your SG changes significantly during your boil. For example, say I only add a little extract, or have a low SG run off from a partial mash or a steep and add my bittering hops. After say 30 mins, I add the remaining extract and now have a high SG boil for an additional 30 mins. For IBU calcs do I consider a 30 min boil at the initial SG and a seperate 30 min boil at the higher SG? Hopefully someone sees where I'm coming from and can give me an idea if they know. The reason I'm looking into something like this is b/c I want to make an Excel spreadsheet with some simple calculations (IBUs, Gravity Units needed to add/remove to make a target OG, etc).