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Calculation Formulae (SG, %ABV,...)

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ScottS

NewBee
Registered Member
Nov 12, 2003
378
1
0
43
www.slezakfarms.com
My rule of thumb is 1 lb of honey in 5 gals of water = 0.008 SG = 1% ABV fermented out. Simple, pretty close to reality, and much easier to remember than those equations. ;D

I have a question about that SG to ABV formula. If I plug in a SG of 1 (= water), I get a ABV% of .994%. What gives?
 

WikdWaze

NewBee
Registered Member
Aug 2, 2004
600
0
0
My rule of thumb is 1 lb of honey in 5 gals of water = 0.008 SG = 1% ABV fermented out. Simple, pretty close to reality, and much easier to remember than those equations. ;D

I have a question about that SG to ABV formula. If I plug in a SG of 1 (= water), I get a ABV% of .994%. What gives?
I guess that's what happens when you use a simplified equation to get an approximation. On the "Mead Made complicated" site they give the actual equations to figure this out, those equations frighten and confuse me :-[
 

JamesP

Senior Member
Lifetime GotMead Patron
Dec 3, 2003
654
1
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53
Brisbane Australia
WikdWaze,

The brackets were left out because I assumed muiltiplication has precedence over addition ;)
Goes to show what assuming does.

Scott S,

Plugging in SG=1.000 says that your FG=1.000, and your mead isn't totally dry, but still has 0.944% Alc to ferment out.
When your FG=0.9927 you will have a totally dry mead. Again this is another assumption, because EC-1118 can probably ferment to FG=0.9927, but some of the other yeasts may not. However, we are talking about potential alcohol :-*

I'm sure you didn't start with OG=1.000 ;)

The URL I mentioned has more details, and there are 5 formulae listed there, each with slightly different results.

-=-=-=-

1lb in 5 gal making 1% ABV - that is an easy one to remember, except for the "metric" people :-/

that makes it (roughly) 0.4 Kg in 19 Litres per 1% ABV
 

jab

NewBee
Registered Member
Mar 15, 2004
557
0
0
46
radiofreeomaha.net
I started writing a PHP application a while back that would allow me to track my brews. Life got in the way and I didn't get very far on it, however, this is the function I was using to figure alcohol content either by weight or vol.

Code:
<?

function figureAlcohol($ograv, $fgrav, $pmode = 'vol')
{
 $alc = (($ograv - $fgrav) * 105);

 if ($pmode == 'vol')
 {
  $alc *= 1.25;
 }

 return $alc;
}

?>
Hope that helps someone.

-jb
 
V

vinoblanco

Guest
Guest
I developed a little spreadsheet that helps you formulate simple recipes, if anybody's interested. Just PM me with your e-mail and I'll send it to you.

B
 
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