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Old 08-14-2012, 05:53 PM   #1
Jul 2012
toronto, ontario
Posts: 51

Just wondering when you calculate efficiency do you use your pre-boil volume or final boil volume?
my pre-boil volume is 5.75G but after I boil I'm aiming for 5. So not sure when I divide by 5.75 or 5?! I normally take a reading soon after mashing.

thanks in advance for everyone's help!

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Old 08-14-2012, 06:10 PM   #2
TopherM's Avatar
Mar 2011
St. Petersburg, FL
Posts: 3,976
Liked 450 Times on 355 Posts

I personally just pop my numbers into BeerSmith and it calculates everything for me.
Primary #1 - Midnight Ryeder (Midnight Wheat and Rye)
Primary #2 - Florida Weiss
Primary #3 - Kane-DOH APA (Honey Citra APA)
Secondary #1 - Downtown Flanders Brown (brewed August 2012)
Keg #1 - Raspberry Florida Weiss
Keg #2 - Cinnamon Raisin Cider
Keg #3 - NONE!
Bottled - NONE!

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Old 08-14-2012, 06:15 PM   #3
Feb 2012
Baltimore, MD
Posts: 171
Liked 19 Times on 9 Posts

You can do either - just use the volume that's there when you take the gravity reading. As a simple example, say you have:

10 lbs 37ppg grain
1 lb 34ppg grain

You can use the equation:

gravity = efficiency * (10*37 + 1*34)/volume

Where gravity here is the last two digits of the gravity reading (i.e. 1.0xx).

So say you get 75% efficiency, then if you measure the gravity pre-boil (with a volume of 5.75gal) you should get a gravity of 0.75*(404)/5.75 = 53

If you measure gravity post-boil (with a volume of 5gal) you should get 61 (1.061 on the hydrometer).

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