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Home Brew Forums > Home Brewing Beer > Fermentation & Yeast > Help - ABV without OG?
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Old 11-04-2012, 04:57 PM   #1
simple-stupid
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Default Help - ABV without OG?

So after two weeks in the primary I went to rack this batch to a carboy, and when I measured the gravity and wrote it down, I realized that I forgot to write down the starting gravity, even though I remember taking it.

So the question is.. what, if anything, can I do to find out ABV, mind you I don't really wanna buy some fancy kit and send it into white labs

Quick specs
OG: ? (I remember it being around 1.080 - 1.085)
FG: 1.026


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Old 11-04-2012, 05:03 PM   #2
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subtract your final gravity from the middle of your OG range. Then multiply by 131.


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Old 11-04-2012, 08:06 PM   #3
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Was it all grain or extract? With extract, assuming you had the correct final volume you can calculate the OG. If you're doing all grain, I'd just assume your average efficiency over the last few batches. Again, assuming you had the correct volume. But if you were brewing something in the 1.080 range, chances are your efficiency took a slight hit, I know mine does on bigger beers.
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Old 11-04-2012, 11:26 PM   #4
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it was extract, but I didn't follow the recipe exactly, I think I'll just have to be guesstimating pretty much

Thanks guys
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Old 11-05-2012, 02:06 AM   #5
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If you post the recipe, someone will calculate it for you.
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Old 11-05-2012, 02:41 PM   #6
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or you can download a program like BrewR or beercalc for your smartphone and plug in your formulae. I have found BrewR to be remarkably accurate! within a 0.2% for ABV. it will provide you OG, projected FG and ABV based on those values.


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