Ss Brewing Technologies Giveaway!

Home Brew Forums > Home Brewing Beer > Beginners Beer Brewing Forum > Working out ABV
Reply
 
LinkBack Thread Tools
Old 06-15-2011, 07:56 PM   #1
renshaw
Feedback Score: 0 reviews
Recipes 
 
Join Date: May 2011
Location: Nottingham, Mansfield
Posts: 98
Default Working out ABV

Just wondering what is the right equation to use.

I've used coopers beer kits they say
(OG-FG)/7.46 + 0.5=ABV%

Another i've read says: (OG-FG) /7.5 =ABV%
then i brought a set yesterday and it says this in the instructions

(OG-FG) /7.365 =ABV%


Because saying that OG was 1070 and ending was 1000 for each in order listed above we get the below results.

9.8
9.3
9.5


I was wondering what is correct?

Thank you.

__________________
renshaw is offline
 
Reply With Quote Quick reply to this message
Old 06-15-2011, 08:02 PM   #2
beergolf
HBT_SUPPORTER.png
Feedback Score: 0 reviews
 
beergolf's Avatar
Recipes 
 
Join Date: Jan 2011
Location: collingswood, nj
Posts: 4,020
Liked 373 Times on 304 Posts
Likes Given: 117

Default

This formula works.

(OG-FG). X 131= ABV

__________________
beergolf is offline
 
Reply With Quote Quick reply to this message
Old 06-15-2011, 08:07 PM   #3
renshaw
Feedback Score: 0 reviews
Recipes 
 
Join Date: May 2011
Location: Nottingham, Mansfield
Posts: 98
Default

Quote:
Originally Posted by beergolf View Post
This formula works.

(OG-FG). X 131= ABV
that does give a reading of 9.17 whats the lowest up to yet.

:S
__________________
renshaw is offline
 
Reply With Quote Quick reply to this message
Old 06-15-2011, 08:22 PM   #4
VTBrewer
Feedback Score: 0 reviews
Recipes 
 
Join Date: Dec 2008
Location: South Burlington, VT
Posts: 847
Liked 5 Times on 5 Posts

Default

I think the x131 is the more commonly used one. It's in Papizan's book. I'm guessing howerever that all are well with in the margin of error of a calibrated hydorometer and the human eye.

__________________
  • Fermenting: Cherry Stout
  • On Tap: Town Hall Hope & King Scotch Ale, Red Hook ESB

Recipes And Blogs: ClubHomeBrew
VTBrewer is offline
 
Reply With Quote Quick reply to this message
Old 06-15-2011, 08:31 PM   #5
renshaw
Feedback Score: 0 reviews
Recipes 
 
Join Date: May 2011
Location: Nottingham, Mansfield
Posts: 98
Default

That is true, I do have two hydrometer,
i might drag my old en' out and see if it gives different reading to the new!
I'm guessing overall with the equations and human eye and hydrometer could make a various of around 1% ether way.

__________________
renshaw is offline
 
Reply With Quote Quick reply to this message
Old 06-15-2011, 10:01 PM   #6
unionrdr
Wannabe author
HBT_LIFETIMESUPPORTER.png
Feedback Score: 0 reviews
 
unionrdr's Avatar
Recipes 
 
Join Date: Feb 2011
Location: Sheffield, Ohio
Posts: 29,118
Liked 2023 Times on 1772 Posts
Likes Given: 1503

Default

I use the cooper's formula & my brain cells to compute ABV%. I'd say the cooper's formula is pretty close.
__________________
Everything works if ya let it-Roady(meatloaf)
My new book is on Amazon Kindle! http://www.amazon.com/dp/B00L3MCU0W
unionrdr is offline
 
Reply With Quote Quick reply to this message
Old 06-15-2011, 10:09 PM   #7
gratefuldisc
Feedback Score: 0 reviews
Recipes 
 
Join Date: Oct 2009
Location: CT
Posts: 127
Liked 3 Times on 1 Posts
Likes Given: 1

Default

http://www.dd26943.com/davesdreaded/...&perav=&calor=

I use this...
__________________
Primary 1: Pumpkin Ale (First ten gallon)
Primary 2: Belgian Pumpkin Ale (First ten gallon)
Primary 3: Autumn Dream Cider
Kegged: Empty
Planning: not sure?


HopRiverAles (my blog)
gratefuldisc is offline
 
Reply With Quote Quick reply to this message
Reply



Quick Reply
Message:
Options
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
What are the chances of this working? verotik Beginners Beer Brewing Forum 6 02-02-2010 12:59 AM
RDWHAHB.....I have and its not working. Selfsufficient Beginners Beer Brewing Forum 20 09-27-2009 05:59 PM
Working with RO water MX1 Beginners Beer Brewing Forum 4 08-12-2009 10:59 AM
working without a net Daddymem Beginners Beer Brewing Forum 2 04-09-2009 07:29 PM
How do I know if it's working. frijole Beginners Beer Brewing Forum 12 01-27-2009 02:10 AM