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> How to calculate ABV
Vinman
post Mar 13 2013, 09:57 AM
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On my hydrometer, it says to simply subtract the FG from the OG and that will give me the ABV. I have also heard to subtract FG from OG and multiply by 131. Which is correct?

My last batch of all-grain had an OG of 1.05 and a FG of 1.00. According to the hydrometer's instructions, that is 5% ABV. If I multiply by 133, the ABV is 6.55. Based on the taste, I think the 5% is correct. Anyone know?

This post has been edited by Vinman: Mar 13 2013, 09:59 AM
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BardsBrew
post Mar 13 2013, 01:49 PM
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QUOTE(Vinman @ Mar 13 2013, 08:57 AM) *
On my hydrometer, it says to simply subtract the FG from the OG and that will give me the ABV. I have also heard to subtract FG from OG and multiply by 131. Which is correct?

My last batch of all-grain had an OG of 1.05 and a FG of 1.00. According to the hydrometer's instructions, that is 5% ABV. If I multiply by 133, the ABV is 6.55. Based on the taste, I think the 5% is correct. Anyone know?


You must multiply the difference in gravity readings by 131. Gravity readings should be taken @ 60 degrees or you must adjust those also.

Cheers!
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pilsenhammer
post Apr 8 2013, 06:40 PM
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If your last batch had a 1.050 OG and a !.000 FG then you might want to check the accuracy of your mashing thermometer. 1.000 on any beer is a really fermentable wort. You may be mashing at lower than desired temp. BTW, if your gravity measurements are correct, the beer is 6.57% according to ProMash.
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organicbrewer
post Jul 29 2013, 07:12 PM
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Using specific gravity. {(Starting gravity) minus (Finishing gravity)} divided by 7.5=alcohol by volume
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