HOMEBREW Digest #5693 Mon 07 June 2010

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  Brix to Specific Gravity Calculations (Jim Stansell)

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---------------------------------------------------------------------- Date: Mon, 07 Jun 2010 15:34:16 -0400 From: Jim Stansell <jim.stansell at comcast.net> Subject: Brix to Specific Gravity Calculations I've searched through the HBD archives as well as other online sources and have found several formulas for converting brix to specific gravity of raw wort. (1) SG = ((Brix-1.6)/220)+1 (2) SG = (260/(260-(Brix/1.04))) (3) SG = 1.000019+0.003865613*(Brix)+0.00001296425*(Brix^2)+0.00000005701128*(Brix^3) (4) SG = 1.000898+0.003859118*(Brix)+0.00001370735*(Brix^2)+0.00000003742517*(Brix^3) The first two are both linear, and my impression was that the relationship (although close) wasn't linear, so I assume that these are approximations. The remaining two are certainly close, although the last one always produces a result for SG that's 0.0009 higher at each brix reading (BTW, it's not exactly the same difference every time, but it always rounds to 0.0009). Finally, when I plug various brix readings into ProMash, I come up with different SGs. For example: (3) (4) ProMash 6.0 brix 1.02369 1.02455 1.02277 9.0 brix 1.03590 1.03677 1.03448 12.0 brix 1.04837 1.04925 1.04644 18.0 brix 1.07413 1.07502 1.07110 Is there a preferred (i.e., most accurate) version or are they all close enough to each other to be acceptable substitutes? Return to table of contents
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