Coldbreak Brewing HERMS Giveaway!

HomeBrewSupply AMCYL Brew Kettle Giveaway!


Home Brew Forums > Home Brewing Beer > Beginners Beer Brewing Forum > Confusion in calculating my ABV
Reply
 
Thread Tools
Old 02-10-2013, 12:40 AM   #1
grovedude
Feedback Score: 0 reviews
Recipes 
 
Join Date: Nov 2012
Location: San Francisco, CA
Posts: 7
Likes Given: 1

Default Confusion in calculating my ABV

Totally newbie question here - and I've even tried searching for the answer but nothing has done the trick. (Maybe I am dense?)

I am trying to calculate my % ABV, and failing. So I took photos in the hope that someone here could teach me.

The photo (which I am going to try to attach here) shows before and after.

Before = minutes before I pitched the yeast
After = 7 days later when I racked it

This is an experimental brew- I am using a Chimay-style of recipe, but instead of Belgian Candy Sugar, I am using agave syrup (not nectar, I actually got it from a friend's tequila distillery in Mexico and brought it home with me. It's the stuff they make tequila out of, direct from the oven.)

Can anyone help me? I think, based on the readings, my experiment may have produced a beer that is extremely low in alcohol.


Click image for larger version

Name:	before-after.jpg
Views:	226
Size:	41.6 KB
ID:	100054  
grovedude is offline
 
Reply With Quote
Old 02-10-2013, 12:47 AM   #2
woody34
Feedback Score: 0 reviews
Recipes 
 
Join Date: May 2012
Posts: 132
Liked 19 Times on 11 Posts

Default

1.072 and 1.030. I use Rooftopbrew website and enter those numbers in their ABV calculator. You probably haven't reached final gravity yet though as its only fermented a week.


woody34 is offline
 
Reply With Quote
Old 02-10-2013, 12:47 AM   #3
iaefebs
Registered User
Feedback Score: 2 reviews
Recipes 
 
Join Date: Aug 2010
Location: West Coast, MI
Posts: 2,663
Liked 244 Times on 176 Posts
Likes Given: 605

Default

Based on a 1.074 OG and a 1.030FG your ABV would be5.8%
iaefebs is offline
 
Reply With Quote
Old 02-10-2013, 12:50 AM   #4
grovedude
Feedback Score: 0 reviews
Recipes 
 
Join Date: Nov 2012
Location: San Francisco, CA
Posts: 7
Likes Given: 1

Default

It's still bubbling in the secondary now, so I wonder how high it is likely to go. Thanks for helping me out - I think I see what you're reading now.
grovedude is offline
 
Reply With Quote
Old 02-10-2013, 01:02 AM   #5
woody34
Feedback Score: 0 reviews
Recipes 
 
Join Date: May 2012
Posts: 132
Liked 19 Times on 11 Posts

Default

You certainly didn't make a weak beer. Your final grav may get down below 1.020. You would have a 7 plus ABV.
Just rough estimates.
woody34 is offline
 
Reply With Quote
Old 02-10-2013, 01:08 AM   #6
iaefebs
Registered User
Feedback Score: 2 reviews
Recipes 
 
Join Date: Aug 2010
Location: West Coast, MI
Posts: 2,663
Liked 244 Times on 176 Posts
Likes Given: 605

Default

Quote:
Originally Posted by grovedude View Post
It's still bubbling in the secondary now, so I wonder how high it is likely to go. Thanks for helping me out - I think I see what you're reading now.
It's more of a how low will it go. Not knowing what you are looking for I'm guessing you are wanting a beer to finish around 1.020 which is 7.1%
iaefebs is offline
 
Reply With Quote
Old 02-10-2013, 01:10 AM   #7
grovedude
Feedback Score: 0 reviews
Recipes 
 
Join Date: Nov 2012
Location: San Francisco, CA
Posts: 7
Likes Given: 1

Default

Thanks! I love this forum!!!!
grovedude is offline
 
Reply With Quote
Old 02-10-2013, 01:13 AM   #8
weirdboy
HBT_LIFETIMESUPPORTER.png
Feedback Score: 4 reviews
Recipes 
 
Join Date: May 2009
Location: Los Angeles
Posts: 7,995
Liked 438 Times on 357 Posts
Likes Given: 63

Default

A simple rule of thumb is to use this equation:

ABV% = (OG - FG) * 131

So in your case:

ABV% = (1.072 - 1.030) * 131 = 5.5


There are other formulas out there, and calculating the actual ABV can actually get quite complicated if you look into the details, but that approximation works well for most beers.
weirdboy is offline
 
Reply With Quote
Old 02-10-2013, 01:16 AM   #9
heckler73
Feedback Score: 0 reviews
Recipes 
 
Join Date: Feb 2012
Location: North Vancouver, BC
Posts: 382
Liked 37 Times on 30 Posts
Likes Given: 2

Default

don't bother with math. that's for university dayze...

http://www.brewersfriend.com/abv-calculator/
heckler73 is offline
 
Reply With Quote
Old 02-10-2013, 01:31 AM   #10
weirdboy
HBT_LIFETIMESUPPORTER.png
Feedback Score: 4 reviews
Recipes 
 
Join Date: May 2009
Location: Los Angeles
Posts: 7,995
Liked 438 Times on 357 Posts
Likes Given: 63

Default

Quote:
Originally Posted by iaefebs View Post
I like how different people read the same scale 3 different ways while everyone read the 1.030 current. I have to ask weirdboy, how did you come up with seeing a 1.068?
Sorry, it was 1.072...I meant to change that number in my other post. I guess I ought to do that so as not to cause more confusion.


weirdboy is offline
 
Reply With Quote
Reply


Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
confusion CliffMongoloid Beginners Beer Brewing Forum 9 04-01-2012 04:44 PM
SG confusion OBSCZONER Fermentation & Yeast 7 01-01-2012 09:27 PM
BG-14 confusion jblizz Brew Stands 10 10-19-2011 11:53 AM
IBU confusion NJames Beginners Beer Brewing Forum 27 04-26-2011 03:17 PM
e-bay confusion polecreek General Chit Chat 18 02-17-2009 07:28 PM


Forum Jump

Newest Threads

LATEST SPONSOR DEALS