ABV Calculation

Discussion in 'Recipe Editor' started by English Brewer, Apr 27, 2018.

  1. English Brewer

    English Brewer New Member

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    https://www.brewersfriend.com/refractometer-calculator/
    https://www.brewersfriend.com/abv-calculator/

    These two calculators appear to offer conflicting opinion on ABV. AI gone mad? (...or daft user)

    Example (both using the alternative ABV equation):

    In the refractometer calc, using Part II enter OG 16.1b and FG 7.6b. This results in the following...
    OG - Corrected:
    16.10 °P, 1.066
    FG - Corrected:
    2.53 °P, 1.010
    Alcohol By Volume:
    7.37%

    In the ABV calculator, enter the plato found above (16.1 - 2.53). This results as...
    Alcohol By Volume:
    7.64%
    Apparent Attenuation:
    84%
    Calories:
    215.2 per 12oz bottle
    Original Gravity:
    16.10 °P, 1.066
    Final Gravity:
    2.53 °P, 1.010

    Notice the ABV differs?

    My 'unearthing' of this contradiction was in an attempt to find the apparent attenuation when using the refractometer calculator, and so as an aside from the potential bug here can I also request this information be included in the refractometer calc page?
     
  2. BeerGuy707

    BeerGuy707 New Member

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    plus one one this...
     
  3. English Brewer

    English Brewer New Member

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    Kinda surprised no response to this one. Pretty essential component of the software and is a glaring flaw!
     
  4. avantassel

    avantassel Moderator
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    When I choose the standard equation on the ABV calc I get the same ABV %, when I choose the alternate equation I get what you are seeing. So that's the difference. Here is an article on the standard vs alternate, https://www.brewersfriend.com/2011/06/16/alcohol-by-volume-calculator-updated/
     
  5. English Brewer

    English Brewer New Member

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    No both examples given are using the alternative abv equation. I do clearly state this outright.
     
  6. okoncentrerad

    okoncentrerad Active Member

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    I get this if I use your numbers

    b1.png

    vs

    b2.png
     

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