Hey all,

I have a question about recipe formulation. I am currently in the process of creating a Black IPA (CDA, whatever, you know what I mean). I usually use a combination of calculations by hand from Daniels’ “Designing Great Beers” book and the BrewPal App on my iPhone because I am OCD. But this time I am having some decent discrepancies and would like your opinion before I go any further…

I use 10.5 gallons for my calculations for final batch size (usually try to run off 12 gallons of wort from the Mash/Sparge, assume about 1.0 boil off over 60ish minutes and lose about .5 elsewhere)

68% assumed brew house efficiency

Target OG; 1.060 Target IBUs: 60 (ish)

My planned recipe is-

2 row pale malt (80% of grist): 20.5 lbs

Crystal 40L (10%): 2.7 lbs

Chocolate malt (5%): 1.7lbs

Midnight Wheat (5%): 1.2 lbs

Columbus hops (14.6%) 4 oz @15 from flameout

Nugget (12.2%) 2 oz @ 15 from flameout

Columbus 2 oz & Nugget 2oz @ flameout

Columbus 2oz & Nugget 2oz @ Dryhop, 7 days

The problem is with my IBU/GU ratio. I would like it to be less than 1.0, but above 0.9 …

The BrewPal program has my OG (for the above listed grain bill) at 1.064 and the IBUs to be 63 for a ratio of 0.98 which I am happy with. But, when I do the calculations I use OG of 1.060 and get 85 IBUs for a ratio of 1.4, which I is a little more than I am looking for…

So, does anyone have any suggestions or thoughts about which one is right and if it’s even significant? I’m not worried about the slight difference in OG but the IBUs seems pretty far apart. Thanks!

Adam