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ajdelange: In sweet wort (i.e., pre-fermentation), the correction factor between refractometer-measured Brix and RE is usually about 1.04 -- i.e., RE = Brix/1.04. In finished beer -- with EtOH boiled off -- the correction factor is more like 1.25. That is, as you suggest, because the...

day_trpper: I keep trying to respond to your posting, but my response never appears. I'll try again. Sorry if this ends up being redundant. There seems to be an inconsistency between your measurements (Brix refractometer vs. hydrometer) of the initial sample. A SG of 1.062 is inconsistent...

ajdelange: I'm getting the impression that you have not really understood what I did. Granted, what I posted in the Documentation is rather dense and voluminous! Let me try to separate the %ABV analytical technique, on the one hand, from the calculator (which estimates %ABV from initial and...

Malfet: If one takes your concerns to the limit, then one would make no estimates of %ABV from hydrometry or refractometry. As you say, both involve making assumptions about stoichiometry. The question is whether those assumptions are reasonable. My stoichiometry, though derived from...

Usually, the correction factor is something less than 1.04. That is, if you divide your Brix by 1.04 and then apply it in polynomials that estimate original SG from Brix, you'll be about in agreement with a measured SG. For example, visit www.brewcalcs.com. Your 1.062 is pretty far from 16.2...

Please elaborate on what you think is wrong with the method presented: Brix on a sample is compared with Brix on a boiled/reconstituted sample. The difference would be due to EtOH boiled off. The sugars and other components would be present in both readings. Knowing the intrinsic...

OG: The difference between your reported Brix of 16.2 and your SG of 1.062 is rather extreme. Usually, at most, I'd see a correction of only about 1.04 to get the Brix to fall into line. In other words, if you plugged your Brix of 16.2/1.04 = 15.6 into the usual polynomials to try to estimate...

I've been working on a web-based calculator to estimate %ABV from initial and final Brix. Yes, there are polynomials that allow OG and FG to be estimated from initial and final Brix, and then one can use one of the many equations to estimate %ABV from OG and FG. But that seems circuitous...