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> How to calculate ABV
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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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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