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Old 06-02-2009, 01:00 PM   #1
Diablo
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Default Help with IBU in Beer Smith

I'm adjusting Orfy's Old Speckled Hen recipe for my batch size and hops. I put it in to Beer Smith and it spat out an IBU of 69. I'm expecting bitterness of around IBU 47 based on the original recipe. The IBU total in the ingredients below add up to 48. Anyone know why the IBU is calculated as 69 ?


BeerSmith Recipe Printout - BeerSmith Brewing Software, Recipes, Blog, Wiki and Discussion Forum
Recipe: OSH CLone
Brewer:
Asst Brewer:
Style: English Pale Ale/Strong Bitter
TYPE: Extract
Taste: (50.0)

Recipe Specifications
--------------------------
Batch Size: 23.00 L
Boil Size: 12.00 L
Estimated OG: 1.051 SG
Estimated Color: 10.0 SRM
Estimated IBU: 69.0 IBU
Brewhouse Efficiency: - %
Boil Time: 60 Minutes

Ingredients:
------------
Amount Item Type % or IBU
1.35 kg Light Dry Extract (8.0 SRM) Dry Extract 37.29 %
1.35 kg Light Dry Extract (8.0 SRM) Dry Extract 37.29 %
0.45 kg Lyle's Golden Syrup [Boil for 15 min] Extract 12.43 %
0.37 kg Caramel/Crystal Malt - 60L (60.0 SRM) Grain 10.22 %
67.00 gm Northern Brewer [10.50 %] (60 min) Hops 42.4 IBU
20.00 gm Goldings, East Kent [6.80 %] (15 min) Hops 4.1 IBU
14.00 gm Goldings, East Kent [6.80 %] (5 min) Hops 1.1 IBU
0.10 kg Dememera Sugar (2.0 SRM) Sugar 2.76 %

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Old 06-02-2009, 01:08 PM   #2
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Go I and check the alpha acid % of each hops. I have found that the percentages are not often the same as whats commonly listed online or the same as what my LHBS sells. My experience has been that the numers in Beersmith are in the upper end of the range for the hops.

Also boil time and boil size can have an effect on the hop utilization and the IBUs.

Other than that, I'm not sure. I'm still a new brewer and have only used Beersmith for a handful of recipes

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Old 06-02-2009, 01:11 PM   #3
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Originally Posted by chode720 View Post
Go I and check the alpha acid % of each hops. I have found that the percentages are not often the same as whats commonly listed online or the same as what my LHBS sells. My experience has been that the numers in Beersmith are in the upper end of the range for the hops.

Also boil time and boil size can have an effect on the hop utilization and the IBUs.

Other than that, I'm not sure. I'm still a new brewer and have only used Beersmith for a handful of recipes

I adjusted the AA% for the hops I have. I expected the total of the IBU values beside each hop addition to equal the total IBU but maybe it's not that simple.
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Old 06-02-2009, 01:29 PM   #4
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Hmmmm...I can't say I have seen that before, but I also haven't used the program very long. Any chance you can post a screenshot?

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Old 06-02-2009, 01:32 PM   #5
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Originally Posted by chode720 View Post
Hmmmm...I can't say I have seen that before, but I also haven't used the program very long. Any chance you can post a screenshot?
The original post is the exported .txt recipe file from Beersmith.
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Old 06-02-2009, 01:34 PM   #6
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I'm pretty sure that the individual IBUs should add up to the total. I'm thinking that it might be a bug in Beersmith. I roughly entered the recipe in Recipator and got 52 IBUs (using the Tinseth method). Contact Beersmith and let them know what you're seeing. I'm curious to know what happens.

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Old 06-02-2009, 01:42 PM   #7
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It might be too early for me to do math properly, but glancing at any of the half dozen or so versions of this recipe on this site, converting them to non-metric measurements, and plugging them into the calculator suggests that your numbers don't look too far off.

Remember that since you're doing a partial boil, your hot wort will have a higher OG, and thus your hops utilization will be off kilter: Realbeer.com Hops Utilization. More bittering hops will be needed for partial boil recipes than with full recipes.

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Old 06-02-2009, 01:48 PM   #8
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Originally Posted by nebben View Post
It might be too early for me to do math properly, but glancing at any of the half dozen or so versions of this recipe on this site, converting them to non-metric measurements, and plugging them into the calculator suggests that your numbers don't look too far off.

Remember that since you're doing a partial boil, your hot wort will have a higher OG, and thus your hops utilization will be off kilter: Realbeer.com Hops Utilization. More bittering hops will be needed for partial boil recipes than with full recipes.
I adjusted the recipe for a late extract addition. What's confusing me is that Beersmith calculates my 60 minute hops addition as 42 IBU, 30 mins as 4 IBU and 5 mins as 1 IBU giving a total of 47 IBU. This is exactly what I was expecting but the IBU of the brew is given as 69 IBU. Hopefully it's just a software bug because I think I've adjusted the recipe correctly.
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Old 06-02-2009, 02:03 PM   #9
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The changing of the values for AA% for each hop is only one aspect of the necessary change.

Did you also adjust weight amounts and times for each to end up at the desired total?

The program does not know what you are doing; you have to do it.

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Old 06-02-2009, 02:06 PM   #10
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Originally Posted by Henry Hill View Post
The changing of the values for AA% for each hop is only one aspect of the necessary change.

Did you also adjust weight amounts and times for each to end up at the desired total?

The program does not know what you are doing; you have to do it.
Yes I did:

67.00 gm Northern Brewer [10.50 %] (60 min) Hops 42.4 IBU
20.00 gm Goldings, East Kent [6.80 %] (15 min) Hops 4.1 IBU
14.00 gm Goldings, East Kent [6.80 %] (5 min) Hops 1.1 IBU

Total of above: 47.6 IBU.

Estimated IBU: 69.0 IBU ????
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