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Old 07-15-2011, 06:10 PM   #1
Cwetherford
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Is there a way to tell the abv without doing a hydrometer test before and after fermentation

 
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Old 07-15-2011, 06:13 PM   #2
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dont think so
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Old 07-15-2011, 06:14 PM   #3
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A refractometer? But either way, you need to know OG and FG to calculate abv.
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Old 07-15-2011, 06:15 PM   #4
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Outside of some major lab gear, no.

Have you taken a final gravity reading? If this is an extract recipe, the og is what your recipe says it will be. If you did the correct final volume then the og if foolproof.

If it's a PM and/or AG, you can still approximate it from the given og in the recipe. But you'll still need an FG reading.
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Old 07-15-2011, 06:36 PM   #5
Cwetherford
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I just did 2kit beers one can kit and one actual boil kit I didnthtake a test on the can kit and I feel like my og on the boil one is off cuz its supposed to be a 5.5% and its barely a 4%er

 
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Old 07-15-2011, 06:55 PM   #6
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sure, you could build a calibration curve. count how many x% beers it takes to get drunk in a certain amount of time, then how many y%, then how many z%. after that, see how many of yours it takes to get drunk and extrapolate .....

on the other-hand, if its an extract kit, the og is known since its a pre-determinate amount of sugar and you would just need an fg. if its been bottled already, you can pour some out to degas overnight and then measure the next day.

 
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Old 07-15-2011, 07:13 PM   #7
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Quote:
Originally Posted by cwetherford View Post
i just did 2kit beers one can kit and one actual boil kit i didnthtake a test on the can kit and i feel like my og on the boil one is off cuz its supposed to be a 5.5% and its barely a 4%er
huh?

You said you didn't take an og, so how do you know it's 4% instead of 5.5?
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Old 07-15-2011, 07:15 PM   #8
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Give us some more info, like the recipes.
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Old 07-15-2011, 08:31 PM   #9
Cwetherford
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The one I didn't test at all is a coopers Canadian blonde can kit and the other was a brewers best american cream ale kilt and I did test the cream al ad it's supposed to come out at about 5.25 to 5.75abv but it's coming out to like....4ish

 
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Old 07-15-2011, 08:40 PM   #10
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Quote:
Originally Posted by Cwetherford View Post
The one I didn't test at all is a coopers Canadian blonde can kit and the other was a brewers best american cream ale kilt and I did test the cream al ad it's supposed to come out at about 5.25 to 5.75abv but it's coming out to like....4ish
What revvy was asking is where did you get the 4%ish ABV if you didn't take an OG of FG. I am also confused, because if you know what your ABV is now, why would you need to know how to calculate it?

 
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