Recipe Calculator - Home Brew Forums
Home Brew Forums > Home Brewing Beer > Beginners Beer Brewing Forum > Recipe Calculator
Sign-up To NEW HBT Article Newsletter - Brewing Articles Direct To You!

Reply
 
Thread Tools
Old 04-05-2009, 04:35 AM   #1
daveooph131
Feedback Score: 0 reviews
Recipes 
 
Join Date: Mar 2009
Location: Dallas, TX
Posts: 1,109
Liked 34 Times on 27 Posts

Default Recipe Calculator

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


daveooph131 is offline
 
Reply With Quote
Old 04-05-2009, 05:37 AM   #2
android
Feedback Score: 0 reviews
Recipes 
 
Join Date: Jan 2009
Location: Ames, Iowa
Posts: 3,060
Liked 42 Times on 33 Posts
Likes Given: 3

Default

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
android is offline
 
Reply With Quote
Old 04-05-2009, 06:16 PM   #3
daveooph131
Feedback Score: 0 reviews
Recipes 
 
Join Date: Mar 2009
Location: Dallas, TX
Posts: 1,109
Liked 34 Times on 27 Posts

Default

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?
daveooph131 is offline
 
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