Recipe Calculator - Home Brew Forums
Register Now For Free!

Home Brew Forums > Home Brewing Beer > Beginners Beer Brewing Forum > Recipe Calculator

Reply
 
Thread Tools
Old 04-05-2009, 04:35 AM   #1
daveooph131
Recipes 
 
Mar 2009
Dallas, TX
Posts: 1,112
Liked 35 Times on 28 Posts



When looking at a recipe calculator what does it mean by "apparent attenuation"?

 
Reply With Quote
Old 04-05-2009, 05:37 AM   #2
android
 
android's Avatar
Recipes 
 
Jan 2009
Ames, Iowa
Posts: 3,062
Liked 44 Times on 35 Posts


from Specific Gravity and Attenuation

Attenuation

Attenuation is a measure of how much of the sugar in the wort has been fermented by the yeast.

In home brewing, we usually deal with apparent attenuation:

apparent attenuation = ( ( OG in points - FG in points ) / OG in points ) x 100

Apparent attenuation is different (higher) than the actual attenuation, because the alcohol produced during fermentation is lighter than water, and throws the reading off.

The apparent attenuation you will get on a given batch depends on a number of factors, including the types of grains/extracts used, mash temperature (if brewing all-grain), and the strain of yeast. Typically, apparent attenuation will range from 65 to 80%. Beers with a lower apparent attenuation will be sweeter, fuller-bodied, and lower in alcohol. Higher apparent attenuation will result in a drier, thinner, higher alcohol brew.

Example:

What is the apparent attenuation of a beer with an OG of 1.055 and a FG of 1.016?

( 55 - 16 ) / 55 x 100 = 71%
__________________
primary: APA

ebay temp controller | thermostat temp controller

 
Reply With Quote
Old 04-05-2009, 06:16 PM   #3
daveooph131
Recipes 
 
Mar 2009
Dallas, TX
Posts: 1,112
Liked 35 Times on 28 Posts


So when the beer recipe calculator asked for apparent attentuation without the OG and FG you can't really calculate correct?

So if you are using the calculator to build a recipe I assume aparent attenuation is just speculation unless you were to use the target OG / FG?

 
Reply With Quote
Reply
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
could my recipe calculator be wrong? rtockst Brewing Software 3 11-07-2009 03:47 PM
Recipe Calculator daveooph131 Beginners Beer Brewing Forum 7 11-04-2009 05:45 AM
Good online calculator to scale recipe down..? beergears Recipes/Ingredients 1 02-08-2008 01:51 PM
New Recipe Calculator for PC/Mac incorporates new BJCP guidelines! richanne General Beer Discussion 0 09-07-2004 12:18 AM


Forum Jump