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Home Brew Forums > Home Brewing Beer > Equipment/Sanitation > Refractometer correction
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Old 05-03-2012, 12:13 AM   #1
kevinb
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Default Refractometer correction

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?

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Old 05-03-2012, 12:16 AM   #2
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I use this site to correct for alcohol.
http://onebeer.net/refractometer.shtml

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Old 05-03-2012, 12:28 AM   #3
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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.

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Old 05-03-2012, 12:30 AM   #4
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Most applications can accept a FG reading from a refractometer as well. It is accurate as long as the correction formula is used.

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Old 05-03-2012, 01:06 AM   #5
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Quote:
Originally Posted by lestershy View Post
I use this site to correct for alcohol.
http://onebeer.net/refractometer.shtml
+1 I use this site as well.
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Old 05-03-2012, 01:16 AM   #6
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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.

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Old 05-03-2012, 01:22 AM   #7
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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/re...er-fg-results/

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Old 05-03-2012, 02:54 AM   #8
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I use this one:
http://seanterrill.com/2012/01/06/re...er-calculator/

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

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Old 05-03-2012, 02:58 AM   #9
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Quote:
Originally Posted by lestershy View Post
I use this site to correct for alcohol.
http://onebeer.net/refractometer.shtml
+1 on this for sure
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Old 02-04-2014, 04:19 PM   #10
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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/re...er-calculator/

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

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