Ss Brewtech’s Biggest Baddest Holiday Giveaway Ever!

Home Brew Forums > Home Brewing Beer > Beginners Beer Brewing Forum > ABV measurement question (post wort additions)
Thread Tools
Old 01-11-2010, 04:48 AM   #1
Feedback Score: 0 reviews
Join Date: Jan 2010
Location: Silver Spring, MD
Posts: 199
Liked 8 Times on 6 Posts
Likes Given: 4

Default ABV measurement question (post wort additions)

Hi all,

I brewed a hybrid of a few recipes I found for an IPA and I'd like to figure out the actual ABV of the final product. The thing is the recipe called for doing the normal extract procedures on brew day, and then 2 days later, adding 1/2 lb of light brown sugar (boiling it first) directly to the fermenter.

My only gravity readings are from the OG (1.062) and the FG (1.014). Going from the text book here, with temp corrections, that says it's around 6.3% ABV. Problem is that has got to be off due to changing the gravity when I added the brown sugar, right? So is there some way to find out how much it altered things?

I found this site which seemed promising. But I took a brix reading that said 6.8 and the FG of 1.014 which gave me 4%. That calculation seems kind of unrealistic though given the OG/FG readings.

If there's no way to figure it out after the fact, could someone at least tell me how to get an accurate calc in the future if I end up doing something like this? Thanks!

neomantra is offline
Reply With Quote
Old 01-11-2010, 05:37 AM   #2
Feedback Score: 0 reviews
Join Date: Nov 2009
Location: Vancouver WA
Posts: 112

A rule of thumb is to add 10 points to the OG for every pound of adjunct sugar. Since you've added a 1/2 pound of brown sugar, I'd say you raised your OG by 5 points, going from 1.062 to 1.067.

Not all chemicals are bad. Without chemicals such as hydrogen and oxygen, for example, there would be no way to make water, a vital ingredient in beer.
-Dave Barry-
barleynhops is offline
Reply With Quote
Old 01-11-2010, 01:27 PM   #3
Feedback Score: 0 reviews
Join Date: Nov 2008
Location: Northwest Arkansas
Posts: 1,060
Liked 87 Times on 52 Posts
Likes Given: 61


Here's a free homebrew calculator. Just enter all your ingredients and voila! All your questions answered.
RCCOLA is offline
Reply With Quote
Old 01-11-2010, 03:46 PM   #4
Feedback Score: 0 reviews
david_42's Avatar
Join Date: Oct 2005
Location: Willamina & Oak Grove, Oregon, USA
Posts: 25,575
Liked 144 Times on 136 Posts


After the fact, you'll need a precision scale and a water bath to boil off the alcohol.
Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"

"I would like to die on Mars, just not on impact." Elon Musk
david_42 is offline
Reply With Quote

Thread Tools

Similar Threads
Thread Thread Starter Forum Replies Last Post
Hops in wort for O.G. measurement ndhowlett All Grain & Partial Mash Brewing 4 11-03-2009 04:27 PM
first wort hop additions HughBrooks General Techniques 12 04-09-2009 12:16 AM
Hop measurement question DD2000GT General Beer Discussion 15 02-19-2009 10:47 PM
First Wort Hopping vs. Late Hop Additions Beerthoven General Techniques 13 02-20-2008 11:46 PM
Stout measurement question tgrier Beginners Beer Brewing Forum 5 12-12-2007 06:39 PM

Forum Jump

Newest Threads