Converting the 'Avg. Perfect Northeast IPA'

Discussion in 'Recipes for Feedback' started by Brewer #88351, May 19, 2020.

  1. Brewer #88351

    Brewer #88351 New Member

    Mar 6, 2017
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    I'm converting the 'Avg. Perfect Northeast IPA (NEIPA)', so it's 1) metric , 2) BIAB, 3) scaled down in size for my equipment and 4) adapted for the efficiency I generally get.

    Here's the original:

    Avg. Perfect Northeast IPA (NEIPA) -

    Whilst converting, the colour and IBU changed and I wanted to get a second opinion on the adapted recipe before going ahead.

    My adaptation:

    Does this look ok, or has something gone wrong when converting? Any tips or tricks appreciated!

  2. ^Tony^

    ^Tony^ Active Member

    Jul 25, 2018
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    Western Canada
    I generally don't worry about the colour as long as the hazy stays gold "ish" and not mud brown and I find IBU to be subjective. IBU can be changed by everything from pH to malt bill to water volumes so I wouldn't worry about a few points change in IBU. I know about how many IBU I like so I stick to that give or take. That said, your conversion looks like it will do the job but you may be a little light in your math.

    I am not a mathematician and prefer simple simple simple. BUT, if I were to convert a recipe I would ignore the #'s and grams of the grain bill until the end. I go with % of fermenter volume to start and that seems to simplify things. The original fermenter vol. is 21.75 Lt (converted) and you want 17 Litre which is 78% of the original recipe. Your pre-volume is 65% if you want to use that ratio instead but the pre-volume has too many variables (heat, boil time, grain volume absorbed, wind speed during boil, trub volume prior to ferm. transfer, etc) which changes everything so, personally, I would still go with fermenter volume. Either way, as long as your consistent with whatever you choose you are likely okay.

    For the primary grain, he/she uses 4.88 kg (converted) pale 2-row so I would use 3.80 kg pale 2-row, which is 78% of the original 4.88 kg weight, for 17 ltr recipe. Etc, Etc, for the rest of the bill. You have 3.30 kg which is an entire pound/454 g difference from my calculations, which will change the flavor so you will have to decide whose/which calculations you are more comfortable with.

    Sooooo basically, I would just use the weight of each ingredient of the original recipe multiplied by which ever ratio you like. For fermenter volume it is 78% or 0.78 x (ingredient).

    Of course, that's just me and unless I am trying to repeat perfection I don't worry all that much about perfect numbers, most of the time.

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