by jkp » Tue Jan 12, 2016 06:11
I think if you want to calculate it to some accuracy, rather than just guestimating from experience, then you'll need to use a spreadsheet rather than pen and paper. I've written a spreadsheet which does most of the calculations I need, colour, gravity, abv, volumes, temperatures, IBUs, and is scalable (I did this mostly out of curiosity but also because I can design it the way I want). Unfortunately I didn't keep a very good account of where I got all the formulae but here is one good resource to get you started,
For other interesting calculations you might look at these
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