Decoction Calculator

Discussion in 'General Brewing Discussions' started by TheZel66, Nov 16, 2012.

  1. TheZel66

    TheZel66 Member

    Joined:
    Sep 22, 2012
    Messages:
    162
    Likes Received:
    5
    Trophy Points:
    18
    Suppose I want to do a single decoction mash, with a protein rest at 140F. Does Brewer's Friend have a caculator that will tell you how much mash to take out and decoct to get the mash to 151F when the decoction is re-introduced back into the mash?
     
  2. LarryBrewer

    LarryBrewer Active Member

    Joined:
    Jun 27, 2012
    Messages:
    1,728
    Likes Received:
    9
    Trophy Points:
    38
    Location:
    Portland, Oregon
    At this time we don't have a decoction calculator.

    It is something we can look into supporting down the road.
     
  3. CROSS

    CROSS New Member

    Joined:
    May 18, 2019
    Messages:
    1
    Likes Received:
    0
    Trophy Points:
    1
    I'm using Brewers friend for the first time, I'm brewing tomorrow. I'm making a NEIPA and like to use a decoction to mash out. It thins out a thick mash from the oats and decreases the possibility of a stuck sparge. I'm bummed Brewers friend doesn't have a decoction calculator. I was using brew toads calculator but it's no more. I'm having trouble finding one.
     
  4. Nosybear

    Nosybear Well-Known Member

    Joined:
    Jul 16, 2012
    Messages:
    9,687
    Likes Received:
    7,183
    Trophy Points:
    113
    Location:
    Aurora, CO, USA
    Second. The equation is rather easy:

    decoction volume = total mash volume * (target temp - start temp) / (boil temp - start temp)

    Plus 15% - 20%. It works for both fahrenheit and celsius.
     
  5. J A

    J A Well-Known Member

    Joined:
    Jan 19, 2016
    Messages:
    3,661
    Likes Received:
    2,933
    Trophy Points:
    113
    Location:
    Austin, Texas
    It's the mass and temperature that matters. If you can manage to weigh what you pull out of the mash, you can do a simple calculation to get you there using this: https://rechneronline.de/chemie-rechner/mix-temperatures.php or something similar. Just have to use weight instead of volume, though there may not be a lot of difference in the weight/volume ratio of wet grain and water.

    For example if you have 10 lbs of grain at 1.5 qts/lb the combined weight of water and grain would be about 41 lbs. In the calculator I referenced, you can fill in the current mash temp and decoction temp (212?), target mash temp and the total weight and it'll calculate the weight of mash/grain you need to pull out.
    Like this:
    upload_2019-5-18_17-38-12.png
     

Share This Page

arrow_white