HBT 2015 Big Giveaway - Enter Now

Huge Supporting Membership Discounts - 20% Off

 Home Brew Forums > determining ABV
04-09-2007, 07:27 PM   #1
mot
Feedback Score: 0 reviews
Recipes

Join Date: Mar 2007
Location: MN
Posts: 628
Liked 2 Times on 1 Posts

 determining ABV

What is the math to determine ABV again. Something like OG - FG divided by 150 times something.

I cant find the math problem anywhere, you guys remember it?

__________________

04-09-2007, 07:30 PM   #2
mot
Feedback Score: 0 reviews
Recipes

Join Date: Mar 2007
Location: MN
Posts: 628
Liked 2 Times on 1 Posts

Oh yeah and a bottling question, Mine is in the secondary at the moment, is it easier to bottle right from there or should I transfer it into my bottling bucket, with the spigot?

__________________

04-09-2007, 07:36 PM   #3
AFK ATM
Feedback Score: 0 reviews

Recipes

Join Date: Aug 2006
Location: People's Republic of Cambridge
Posts: 3,323
Liked 6 Times on 6 Posts

Quote:
 Originally Posted by mot What is the math to determine ABV again. Something like OG - FG divided by 150 times something. I cant find the math problem anywhere, you guys remember it?
Not sure what the math is but John Palmer has a table on his website howtobrew.com.

Quote:
 Originally Posted by mot Oh yeah and a bottling question, Mine is in the secondary at the moment, is it easier to bottle right from there or should I transfer it into my bottling bucket, with the spigot?
I would go with the bottling bucket myself.
__________________
And now we go AG!

Planning: Extra Special Bitter

04-09-2007, 08:06 PM   #4
mot
Feedback Score: 0 reviews
Recipes

Join Date: Mar 2007
Location: MN
Posts: 628
Liked 2 Times on 1 Posts

couldnt find the chart, Ill have to do some searching for the math problem

__________________

04-09-2007, 08:11 PM   #5
magno
Feedback Score: 0 reviews

Recipes

Join Date: Feb 2006
Location: Austin, TX
Posts: 909
Liked 7 Times on 5 Posts

I think the formula is:

ABV = (OG - FG)*131

so a 1.050 beer that finished at 1.007 would have about 5.6% ABV

(1.050 - 1.007) * 131 = .043 * 131 = 5.633

Promash says it shoulf be 5.66%. Close enough for me.

- magno

__________________

04-09-2007, 08:13 PM   #6
Blender
Feedback Score: 0 reviews

Recipes

Join Date: Jan 2006
Location: Santa Cruz, CA.
Posts: 3,116
Liked 6 Times on 4 Posts

I always thought that you subtract the FG from the OG and multiply the difference by 131.

__________________

Gary

04-09-2007, 08:15 PM   #7
mot
Feedback Score: 0 reviews
Recipes

Join Date: Mar 2007
Location: MN
Posts: 628
Liked 2 Times on 1 Posts

thanks guys, I thought there was a few more steps in it but I could very well be wrong

__________________

04-09-2007, 08:17 PM   #8
homebrewer_99
Feedback Score: 0 reviews

Recipes

Join Date: Feb 2005
Location: Atkinson (near the Quad Cities), IL
Posts: 17,950
Liked 91 Times on 77 Posts
Likes Given: 1

Og - Fg * 105 = Abw

Abw * 1.25 = Abv

__________________
HB Bill

04-09-2007, 08:18 PM   #9
sirsloop
Feedback Score: 0 reviews
Recipes

Join Date: Jun 2006
Location: South River, NJ
Posts: 2,592
Liked 17 Times on 15 Posts
Likes Given: 1

i use... ABV = (OG - FG)*131

__________________
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~
~~~~~~~~~~~___//_ ____________________________~~~~~~~~~~~
~~~~~~~~~_/ [][]| | /```\/```\/```\/```\/```\ |~~~~~~~~~~
~~~~~~~_/_______| |____NOW TRIPLE HOPPED______|~~~~~~~~~~
~~~___/[_]| 00 /| | \,,,/\,,,/\,,,/\,,,/\,,,/ |~~~~~~~~~~
~~|___|___|___/_| |___________________________|~~~~~~~~~~
~~|=(*)[________]==(*)(*)=| \________/=(*)(*)=|~~~~~~~~~~

04-09-2007, 08:19 PM   #10
hialtitude
Feedback Score: 0 reviews
Recipes

Join Date: Mar 2007
Location: Missoula MT
Posts: 86

Here is the link to Palmer's table.
http://www.howtobrew.com/section1/chapter9-4.html

__________________