What gives? I must be using the Promash calculator wrong. I have a brix refractometer and my OG was 12 and FG 6. Promash gives me an ABV of 2.90 and the Onebeer.net calculator gives me an ABV of 5.26. What gives!?!
Promash % Alc vs. Onebeer.net
- Thread starter ryandlf
- Start date
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Did you convert the Brix reading of 6 for a final gravity? Refractometers can't be used once fermentation has begun without some calculations to account for the alcohol. A 6 is a very high FG, so I would hope you haven't bottled until you take a hydrometer reading!
Anyway, the easiest way to figure ABV is to convert your brix readings to SG and then do some simple math. (OG-FG) x 131= ABV.
So, in this case, if 6 is really the FG (and I hope that's wrong!), you have:
(1.048-1.024) x 131= 3.1% ABV
Anyway, the easiest way to figure ABV is to convert your brix readings to SG and then do some simple math. (OG-FG) x 131= ABV.
So, in this case, if 6 is really the FG (and I hope that's wrong!), you have:
(1.048-1.024) x 131= 3.1% ABV
ryandlf
Well-Known Member
Oh ok. I didn't realize that the alcohol was messing with the refractometer readings. According to this calculator my actual FG is 1.009 giving my an ABV of roughly 4.8% which is much better 
I've been trying to figure out why my ferments are coming in so high since I got my new toy
Does anyone know if promash has a built in calculator to compensate for fermenting beer like that other calculator I posted?
I've been trying to figure out why my ferments are coming in so high since I got my new toy Does anyone know if promash has a built in calculator to compensate for fermenting beer like that other calculator I posted?
