Refractometer correction

[kevinb]

My wife bought me a refractometer for my birthday today (yes I have a great wife). I typically extract brew. However, I like the idea of being able to use a couple drops of wort to make a measurement.

I have seen other posts that say they are only accurate before fermentation because of the alcohol after fermentation. Does the Excel spreadsheet on more beer work for FG correction ? Is it accurate? Does anyone else have a conversion that they can tell me about?

 

[lestershy]

I use this site to correct for alcohol.
http://onebeer.net/refractometer.shtml

 

[jtejedor]

I use mine during fermentation and after it's done and with the gravity correction its pretty accurate. If I am really really curious I will take a FG reading with a hydrometer. If you have an android phone the brewzor calculator is a great app and includes a refractometer gravity correction tool.

 

[jslay77]

Most applications can accept a FG reading from a refractometer as well. It is accurate as long as the correction formula is used.

 

[Sacdan]

I use this site to correct for alcohol.
http://onebeer.net/refractometer.shtml

+1 I use this site as well.

 

[BPhad]

I've used the morebeer spreadsheet and it seems to work fine. I do take both a refract and hydrometer reading before pitching yeast, then let the spreadsheet do the work after based on refract. I did check the first few readings both ways and it worked fine.

 

[Zen_Brew]

Some more food for thought. Sean Terrill did a series of experiments to verify common refractometer correction curves and made some adjustments to the common curve. In my experience with it, I find his spreadsheet to correct for readings I used to get that were too low.

http://seanterrill.com/2011/04/07/refractometer-fg-results/

 

[Marquez]

I use this one:
http://seanterrill.com/2012/01/06/refractometer-calculator/

Look here for more information about it:
http://seanterrill.com/2010/06/11/refractometer-estimates-of-final-gravity/

 

[Johnnyhitch1]

I use this site to correct for alcohol.
http://onebeer.net/refractometer.shtml

+1 on this for sure

 

[brewski09]

I found both Sean Terrill's calculator and the brewers friend to be very close to my actual hydrometer readings (.002 SG points less than actual hydrometer readings).

http://seanterrill.com/2012/01/06/refractometer-calculator/

http://www.brewersfriend.com/refractometer-calculator/

 

[Allergic2hops]

I use this site to correct for alcohol.
http://onebeer.net/refractometer.shtml

Thanks!