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Calculating Og From Fg Hydro And Refrac Readings...

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Mr. No-Tip

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I put down some JAO mead a few months ago. Given the low quantities and the ease of my first batch, I didn't take OG readings.

I bottled it the other day. My mead came out at 1050 and my melomel came out at 1070. Ouch.

I am told I can calculate the OG with the help of my FG readings on a hydro and a refracto.

My melomel has an FG of 1070 and a refracto reading of 1086 (20.65 brix).

Brewheads has a calculator: http://www.brewheads.com/refract-getog.php, but I've found their calculators to give wrong data in the past. It suggests an OG of 2.183. Not sure I trust that.

I can see references to using the morebeer spreadsheet here: http://www.thebrewingnetwork.com/forum/vie...=19&t=21873, but whenever I try to follow it, the spreadsheet doesn't seem to work as advertised.


Any tips on how to do the maths?
 

felten

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With the FG numbers you got, my beersmith says the OG was 1.115
 

Punkal

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Sorry a bit of a hijack. I took a reading on my new refractometer the other day and my heart skipped a beat when I saw 1024 as my FG... After doing a conversion my hear rate returned back to normal. I have a SW aquarium and have used that refractometer for a long time there is no need to do an conversions with that sucker... I found a refractometer OG-Alcohol Corrections picture that is a quick and dirty reference.

Refractometer_Calculations___70_30_b.jpg

In my travels to find the refractometer corrections table I did stumble across a few sites that had the conversion you are looking for sorry that is not what I was after so I did not take any notes or save any bookmarks.
 

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