Things that affect SG

[Jokester]

If I took a mead that was at 1.00 or just under, and I freeze concentrated it to say be under .990 - which is where my hydrometer stops what would be its abv ?
Is there an online calculator for that sort of thing.

 

[VikeMan]

First, you'd need to know the ABV before you freeze the mead. This depends not only on the FG, but also the OG. Here's one calculator for that.
https://www.meadmakr.com/abv-calculator/
After you freeze concentrate it, you could calculate the approximate ABV using the starting ABV, the starting volume, and the concentrated volume.

Concentrated ABV = Starting ABV x (Starting Volume / Concentrated Volume)

 

[Jokester]

Oh, just the FG of the mead wont be enough ?
No I have used that abv calculator before. No, that is assuming if I did 1/2 the volume the concentration doubled. No, OK I have a mead that was just under 11lb honey in 5 gal, and it fermented to right at 1.00 as of yesterday.
I want to freeze concentrate it and say its .96 - is there a calculator that would take 1.00 at 10% abv and .95 FG and give me abv increase from 1.00@10%.
That calculator says 1.00 OG to .95FG is 6.4% which I know isn't possibly true. Cos then it would be 16% - which maybe it is true.

 

[Jokester]

Never mind, its a good assumption if you freeze concentrate to 1/2 the volume you're 2X the abv. I have asked this question before and got the same reply.

 

[pdhirsch]

Never mind, its a good assumption if you freeze concentrate to 1/2 the volume you're 2X the abv. I have asked this question before and got the same reply.

Correct. But as @VikeMan says, you need to know both the OG and the FG in order to calculate ABV to begin with.

 

[bracconiere]

if you have a BRIX refractometer, and a hydro, there are calculators to tell you ABV....

 

[Jokester]

if you have a BRIX refractometer, and a hydro, there are calculators to tell you ABV....

Oh I have both. Let me google it.

 

[bracconiere]

Oh I have both. Let me google it.

i'll hand you a link to one...it's the one that calculates ABV from current gravity and BRIX..

Homebrew Refractometer Calculator


(it's an estimate, but in my experience...pretty damn good one....)

edit: just double checked it with my hard lemonaid...i added 5lbs 50-55%ABV booze to a keg, and an unknown amount of sugar from the lemonaid mix...but i got a SG reading of 1.005 and a BRIX reading of 6.5...so pretty much spot on....

 

[Jokester]

I will have to try it, right now I cant find my refractometer.

 

[bracconiere]

right now I cant find my refractometer.

maybe the light is bending around it?