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Old 12-14-2012, 05:43 AM   #1
Monkey55
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Jun 2010
SoCal
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Hey,

I've been using Hopville's online calculator and it's not giving me correct ABV's.

A year ago, I bought a kit from my LHBS. The label said it was 5.2% abv. I double checked it against Hopville and it almost spot on.

Now, the calculator now says that it has a lower abv.

Here is my fermentables:
6lbs LME
1lbs Crystal 150
.25 Belgian Special B
.25 Roasted Barley

S-04 Yeast.

It's supposed to be 5.2% abv. The calculator now says it is 4.5%

Thoughts feedback. Maybe someone can help me by double checking it against another calculator.

Thanks,
E

 
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Old 12-14-2012, 08:07 AM   #2
Monkey55
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Jun 2010
SoCal
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After posting this thread, I clicked on the "Similar Threads" links at the bottom and found a few other online calculators.

This one seems to be closer http://www.brewology101.com/AleAbacus#

It's showing that it's 5% abv.

Thanks
E

 
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Old 12-14-2012, 03:01 PM   #3
zeg
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Jan 2012
West Lafayette, IN
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What do you assume for your final volume? Using my default settings, I get 4.7-4.8% ABV for a 5.5 gallon batch, 5-5.3 for a 5 gallon batch.

The variation depends on assumptions about post-boil volume losses.

 
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Old 12-14-2012, 05:25 PM   #4
Monkey55
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Jun 2010
SoCal
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Quote:
Originally Posted by zeg View Post
What do you assume for your final volume? Using my default settings, I get 4.7-4.8% ABV for a 5.5 gallon batch, 5-5.3 for a 5 gallon batch.

The variation depends on assumptions about post-boil volume losses.
I am doing 5 gallons for my final volume.

Did you run it through Beer Smith? Your target abv's look close to what I used to get using Hopville.

I'm on a Mac. From what I can remember, Beer Smith does not run on a Mac.

Thanks,
E

 
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Old 12-14-2012, 05:58 PM   #5
duboman
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Jul 2011
Glenview, IL
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(OG-FG)*131=ABV

Pretty simple if you have your OG and your FG regardless what the recipe states. If your starting and finished gravities were different then then so too will be your ABV
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Old 12-14-2012, 08:21 PM   #6
zeg
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Jan 2012
West Lafayette, IN
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BeerSmith 2 runs on my Mac just fine. It's what I used, but duboman's formula is find up to ABV around 10%. Above that it can underestimate by a bit. (I don't know whether BeerSmith uses a more sophisticated model or not.)

 
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Old 12-14-2012, 08:23 PM   #7
Nightshade
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Apr 2012
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It will also vary on the brewing efficiency you put into the calculator so you may need to double check that it is correct or closer to correct.
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Old 12-14-2012, 08:39 PM   #8
zeg
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Jan 2012
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Yeah, though since the majority of the gravity comes from extract, efficiency shouldn't make a big difference except through volume losses.

 
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Old 12-14-2012, 08:44 PM   #9
duboman
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Quote:
Originally Posted by Nightshade
It will also vary on the brewing efficiency you put into the calculator so you may need to double check that it is correct or closer to correct.
Only if discussing estimated ABV.

The equation I mentioned will tell you what your ABV is as determined by knowing the actual FG and OG of your beer.
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Old 12-14-2012, 08:55 PM   #10
Nightshade
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Quote:
Originally Posted by duboman View Post
Only if discussing estimated ABV.

The equation I mentioned will tell you what your ABV is as determined by knowing the actual FG and OG of your beer.
My bad, I missed that part of this conversation...carry on
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