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Old 08-18-2005, 03:06 PM   #1
Aug 2005
Posts: 15

How do you calculate this. My initial gravity reading was 1.045. Bottling today and will be taking a reading.


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Old 08-18-2005, 03:18 PM   #2
tnlandsailor's Avatar
Apr 2005
Knoxville, TN
Posts: 522
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I pulled this off of another board. This equation agrees with the calculator in Promash (or at least close enough).

Alcohol by Weight(abw) = (OG-FG) * 105

Alcohol by Volume(abv) = abw * 1.25

So for your beer, take 1.045 and subtract your gravity reading, multiply by 105 and then multiply the entire result by 1.25 to get %ABV (most everyone means %ABV when they talk about % alcohol.



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Old 08-18-2005, 04:02 PM   #3
Sasquatch's Avatar
Jun 2005
Posts: 539
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Holy cow I just read em off the chart on the hydrometer and subtract the difference!
Primary: Lager

Secondary: Sangiovese, Honey Nut Brown, some Pilsner/ale kinda thing that just won't quit...

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Old 08-18-2005, 04:20 PM   #4
andre the giant
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May 2005
Southeast Missouri, USA
Posts: 539
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Someone here or elsewhere mentioned this site a while back.

You just type in the OG, FG and punch "calculate" and you get calories, carbs, ABV, ABW. Its a nice quick way to find out how much weight you'll be putting on, and how drunk you'll get doing it.
After a year of sitting idle, Andre's All-Grain Brewery has reopened.
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Old 08-18-2005, 04:32 PM   #5

The formula I have used is to calculate ABV is one I got in a Coopers ale kit a long time ago. I know it by heart:

OG - FG -/- 7.46 +.2. You drop the decimals. Eg: 1045-1012 = 33 -/- 7.46 = 4.42 +.2 = 4.62% ABV

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