beer math - Home Brew Forums
Home Brew Forums > Home Brewing Beer > General Beer Discussion > beer math

Reply
 
Thread Tools
Old 06-23-2008, 07:41 PM   #1
beerthirty
big beers turn my gears
HBT_LIFETIMESUPPORTER.png
 
beerthirty's Avatar
Recipes 
 
May 2008
Podunk, VA. Not far from the NC line.
Posts: 2,589
Liked 32 Times on 14 Posts



I want to learn bear math. Bobby_M's website was very useful in understanding and learning about efficiency and the math to figure it, but I would also like to learn how to calculate what FG should be for a given recipe. I know a lot of people just plug the numbers into a beer program. I would rather learn how to do the calculations than have to buy a program to do them for me. Can anyone point me in the right direction or provide a link to a site I could learn from?
__________________
Quote:
Originally Posted by the_bird View Post
"I've got a fever... and the only prescription is, MORE CARBOYS!"
primary- Tangerine Dream, SWMBO slayer,
serving- amber ale hop experiment #6, Roggenbier, apfelwine
planning- Cru?
conditioning- 9/9/09 barleywine
Drink water?... Never, fish fornicate in it.--- W.C. Fields
Most problems can be solved with the proper application of force.

 
Reply With Quote
Old 06-23-2008, 07:45 PM   #2
findthefish
Recipes 
 
Feb 2008
Orange, CA
Posts: 473
Liked 6 Times on 5 Posts


http://www.moorescott.net/marc/homebrew.htm
__________________
Kevin

The Bruery Provisions - Homebrewing supplies and equipment.
BrewCommune - Orange County home brew club, yeast database, recipes, and forum.

On Deck: Belgian IPA
Primary: nothing
Secondary: Traditional Mead
Kegged: APA, Cream Ale, Belgian Ale, Sour Belgian, Barrel Aged RIS

 
Reply With Quote
Old 06-23-2008, 07:58 PM   #3
beerthirty
big beers turn my gears
HBT_LIFETIMESUPPORTER.png
 
beerthirty's Avatar
Recipes 
 
May 2008
Podunk, VA. Not far from the NC line.
Posts: 2,589
Liked 32 Times on 14 Posts


Quote:
Originally Posted by findthefish View Post
Thank you Kevin
__________________
Quote:
Originally Posted by the_bird View Post
"I've got a fever... and the only prescription is, MORE CARBOYS!"
primary- Tangerine Dream, SWMBO slayer,
serving- amber ale hop experiment #6, Roggenbier, apfelwine
planning- Cru?
conditioning- 9/9/09 barleywine
Drink water?... Never, fish fornicate in it.--- W.C. Fields
Most problems can be solved with the proper application of force.

 
Reply With Quote
Old 06-23-2008, 08:00 PM   #4
bradsul
Flyfisherman/brewer
HBT_LIFETIMESUPPORTER.png
 
bradsul's Avatar
Recipes 
 
Sep 2006
Ontario, Canada
Posts: 4,893
Liked 30 Times on 24 Posts


Get yourself a copy of Designing Great Beers, can't recommend it enough!
__________________
Brad
Canadian Brewers Unite!


Projects: Sylvania Kegerator Conversion, Tower Cooling, Grain Milling Station

 
Reply With Quote
Old 06-23-2008, 08:07 PM   #5
Beerthoven
Recipes 
 
May 2007
Cary, NC
Posts: 2,176
Liked 36 Times on 31 Posts


Quote:
Originally Posted by beerthirty View Post
...but I would also like to learn how to calculate what FG should be for a given recipe. ...
Let A be the rate of attenuation of your yeast.

Then FG is approximately equal to OG x (1 - A).

Example: suppose OG = 1.050 and the yeast you are using has an average attenuation of 75%. Then your FG will approximately be 50 x (1 - 0.75) = 12.5, or 1.0125.

This is only an approximation, since numerous other factors affect final attenuation, like mash temp and time and fermentation temp.

Here is an article from the wiki about all the various factors that affect attenuation.
__________________

Primary/Secondary: #132 American Wheat
Kegged: #130 American Pale Ale, #131 Stone IPA clone
Planned: London ESB, West Coast IPA


 
Reply With Quote
Old 06-23-2008, 08:41 PM   #6
jcarson83
 
jcarson83's Avatar
Recipes 
 
Jun 2006
Springfield, MO
Posts: 928
Liked 15 Times on 10 Posts


Quote:
Originally Posted by bradsul View Post
Get yourself a copy of Designing Great Beers, can't recommend it enough!
This was probably the single most important source of information for me. Here are some others

http://www.rooftopbrew.net/ibu.php
http://realbeer.com/hops/
http://www.weekendbrewer.com/brewingformulas.htm

 
Reply With Quote
Old 06-23-2008, 11:16 PM   #7
beerthirty
big beers turn my gears
HBT_LIFETIMESUPPORTER.png
 
beerthirty's Avatar
Recipes 
 
May 2008
Podunk, VA. Not far from the NC line.
Posts: 2,589
Liked 32 Times on 14 Posts


thank you all for the links, looks like I have some reading ahead.
__________________
Quote:
Originally Posted by the_bird View Post
"I've got a fever... and the only prescription is, MORE CARBOYS!"
primary- Tangerine Dream, SWMBO slayer,
serving- amber ale hop experiment #6, Roggenbier, apfelwine
planning- Cru?
conditioning- 9/9/09 barleywine
Drink water?... Never, fish fornicate in it.--- W.C. Fields
Most problems can be solved with the proper application of force.

 
Reply With Quote


Reply
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Beer Math Challenge! BrianCSA General Beer Discussion 10 07-14-2009 07:41 PM
looking for the beer math gurus Jaybird Recipes/Ingredients 10 06-21-2007 06:57 AM
Beer Math LS_Grimmy Recipes/Ingredients 1 04-30-2007 06:56 PM
Math. Orfy General Techniques 8 12-07-2005 04:06 AM


Forum Jump