Coldbreak Brewing HERMS Giveaway!

HomeBrewSupply AMCYL Brew Kettle Giveaway!


Home Brew Forums > Home Brewing Beer > Extract Brewing > Calculating IBU's. Is Brewing software accurate enough, or is my recipe off?
Reply
 
Thread Tools
Old 09-18-2009, 03:29 PM   #1
Graeme
Feedback Score: 0 reviews
Recipes 
 
Join Date: Mar 2009
Location: Dublin, Ireland
Posts: 238
Default Calculating IBU's. Is Brewing software accurate enough, or is my recipe off?

I'm just wondering do most people here use software to calculate their beers specs? I was using tastybrew.com which I've used before to check individual specs such as IBU's and priming sugar volumes. I decided to check the IBU's on an Avery New World Porter Clone I am doing. The recipe states it's 44 IBU's, however, this calculated just around 17. How accurate are these things? It could well be my recipe? I got it from BYO so it should be decent.


Graeme is offline
 
Reply With Quote
Old 09-18-2009, 03:44 PM   #2
Graeme
Feedback Score: 0 reviews
Recipes 
 
Join Date: Mar 2009
Location: Dublin, Ireland
Posts: 238
Default

I tried to copy and paste the specs, but it was all over the place, the schedule is basically:

0.33oz Coumbus@60
0.25oz Columbus @30
0.96oz Columbus @0
1.960z Fuggles@0


Graeme is offline
 
Reply With Quote
Old 09-18-2009, 03:56 PM   #3
Yooper
Ale's What Cures You!
HBT_ADMIN.png
Feedback Score: 0 reviews
 
Yooper's Avatar
Recipes 
 
Join Date: Jun 2006
Location: UP of Michigan
Posts: 65,404
Liked 6033 Times on 4302 Posts
Likes Given: 1555

Default

In order to correctly estimate the IBUs, you also need to know the boil size and the ingredients of the brew.
__________________
Broken Leg Brewery
Giving beer a leg to stand on since 2006

Follow me on facebook: https://www.facebook.com/lorena.t.evans
But I'm pretty boring so don't expect much!
https://www.facebook.com/lorena.t.evans
Yooper is offline
 
Reply With Quote
Old 09-18-2009, 03:57 PM   #4
Joker
Feedback Score: 0 reviews
 
Joker's Avatar
Recipes 
 
Join Date: Nov 2007
Location: Orygun
Posts: 1,963
Liked 21 Times on 20 Posts
Likes Given: 4

Default

You also need the percentages for the alpha acid units to calculate them correctly and the percent changes year to year so that could be throwing off the math as well.
Joker is offline
 
Reply With Quote
Old 09-18-2009, 03:57 PM   #5
Yooper
Ale's What Cures You!
HBT_ADMIN.png
Feedback Score: 0 reviews
 
Yooper's Avatar
Recipes 
 
Join Date: Jun 2006
Location: UP of Michigan
Posts: 65,404
Liked 6033 Times on 4302 Posts
Likes Given: 1555

Default

Which issue of BYO is it in? I can take a look at the recipe, and see why it's so different for you.
__________________
Broken Leg Brewery
Giving beer a leg to stand on since 2006

Follow me on facebook: https://www.facebook.com/lorena.t.evans
But I'm pretty boring so don't expect much!
https://www.facebook.com/lorena.t.evans
Yooper is offline
 
Reply With Quote
Old 09-18-2009, 04:08 PM   #6
Graeme
Feedback Score: 0 reviews
Recipes 
 
Join Date: Mar 2009
Location: Dublin, Ireland
Posts: 238
Default

Thanks Yooper, it's BYO's 150 classic clones. I had entered all percentages and boil volumes, I tried to copy and paste the results here but it was messed up
Graeme is offline
 
Reply With Quote
Old 09-18-2009, 04:14 PM   #7
Yooper
Ale's What Cures You!
HBT_ADMIN.png
Feedback Score: 0 reviews
 
Yooper's Avatar
Recipes 
 
Join Date: Jun 2006
Location: UP of Michigan
Posts: 65,404
Liked 6033 Times on 4302 Posts
Likes Given: 1555

Default

Ok, I found it. What size boil are you doing?
Extract or AG?

Also (most important, actually!) take a look at the hops schedule in the book. Thay have .33 of 13% AAU Columbus. If you're entering Columbus at 10% AAU, the figure will drastically change. So, check your hops, and check the calculator to make sure you're comparing apples to apples.
__________________
Broken Leg Brewery
Giving beer a leg to stand on since 2006

Follow me on facebook: https://www.facebook.com/lorena.t.evans
But I'm pretty boring so don't expect much!
https://www.facebook.com/lorena.t.evans
Yooper is offline
 
Reply With Quote
Old 09-18-2009, 04:17 PM   #8
Graeme
Feedback Score: 0 reviews
Recipes 
 
Join Date: Mar 2009
Location: Dublin, Ireland
Posts: 238
Default

I'm doing the partial mash extract version. I'm boiling 23 liters (6 gallons)
Graeme is offline
 
Reply With Quote
Old 09-18-2009, 05:48 PM   #9
Graeme
Feedback Score: 0 reviews
Recipes 
 
Join Date: Mar 2009
Location: Dublin, Ireland
Posts: 238
Default

My columbus are actually 14.2%. The fuggles are slightly less in AA% but they are being added at whirlpool and won't contribute much to the IBU's
Graeme is offline
 
Reply With Quote
Old 09-18-2009, 10:33 PM   #10
Yooper
Ale's What Cures You!
HBT_ADMIN.png
Feedback Score: 0 reviews
 
Yooper's Avatar
Recipes 
 
Join Date: Jun 2006
Location: UP of Michigan
Posts: 65,404
Liked 6033 Times on 4302 Posts
Likes Given: 1555

Default

You're right- that recipe has you do a late extract addition, which increases hops utilization but it's no where near 44 IBUs. I come up with 16.7 if you follow their recipe, with the 2.5 gallon boil and late extract addition. With a full boil, I come up with 20 IBUs.

I never had that beer, but would think that the recipe is jacked up. I have the issue, but I've never brewed anything from it so I don't know if it's just this one recipe, or many of them.


__________________
Broken Leg Brewery
Giving beer a leg to stand on since 2006

Follow me on facebook: https://www.facebook.com/lorena.t.evans
But I'm pretty boring so don't expect much!
https://www.facebook.com/lorena.t.evans
Yooper is offline
 
Reply With Quote
Reply


Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Calculating IBU's with BeerSmith smalltown2001 Recipes/Ingredients 2 10-18-2009 12:41 PM
Oatmeal Stout IBU's (Jamil Zainasheff's Recipe) piperbrew Recipes/Ingredients 15 08-01-2009 05:42 AM
Most accurate brewing software Blindguardian Brewing Software 17 05-28-2009 01:48 PM
Brewing Software? jimmi75 Equipment/Sanitation 9 06-08-2007 05:12 PM
Software For Brewing Schlenkerla HomeBrewTalk Announcements & Feedback 12 04-30-2007 10:49 AM


Forum Jump

Newest Threads

LATEST SPONSOR DEALS