HBT 2015 Big Giveaway - Enter Now

Huge Supporting Membership Discounts - 20% Off

 Home Brew Forums > ABV when adding sugar during fermentation
05-30-2012, 07:58 PM   #1
bGoliath
Feedback Score: 0 reviews
Recipes

Join Date: Apr 2012
Location: Sumner, Wa
Posts: 7
 ABV when adding sugar during fermentation

I have been fermenting the Imperial Pale Ale from the Extreme Brewing book. I was wondering how I calculate the ABV after I added 12oz of light brown sugar the 2nd day of fermentation. The OG was 1.054 and is currently 1.021 (at day 5). I'm not bottling for another 2 weeks though.

__________________

05-30-2012, 08:20 PM   #2
frazier
Feedback Score: 0 reviews
Recipes

Join Date: Dec 2009
Location: illinois
Posts: 1,807
Liked 126 Times on 109 Posts
Likes Given: 9

Math is your friend. This is a case where a reading will probably not tell you what you need to know.

A 1.054 OG for a 5 gallon batch means 54 x 5 = 270 gravity points (GPs). To that, add the contribution of the sugar: 44 points per pound x .75 pounds = 33 GPs.

270 + 33 = 303; 303 / 5 = 60.6 (call it 61). So when calculating your ABV, consider the OG to have been 1.061 (since that's how much sugar ended up in the wort) and go from there.

Now, if you had mixed the sugar in say a quart of water, you would divide the 303 GPs by 5.25 (gallons) instead of 5.

Cheers!

__________________

~
"Anything worth doing, is worth doing slowly." ~~ Mae West

2
People Like This
05-30-2012, 08:30 PM   #3
bGoliath
Feedback Score: 0 reviews
Recipes

Join Date: Apr 2012
Location: Sumner, Wa
Posts: 7

Awesome, thanks for the brew math lesson. Very helpful.

__________________