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#1
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Homebrewer ![]() ![]() Group: Members Posts: 31 Joined: 31-March 04 From: Raleigh, NC Member No.: 1,971 ![]() |
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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#2
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Assistant Brewer ![]() ![]() ![]() Group: Members Posts: 57 Joined: 19-June 09 From: U.P. MI Member No.: 14,736 ![]() |
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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#3
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Brewer ![]() ![]() ![]() ![]() Group: Members Posts: 262 Joined: 9-January 09 From: Illinois Member No.: 13,746 ![]() |
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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#4
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Brewer ![]() ![]() ![]() ![]() Group: Members Posts: 367 Joined: 19-July 05 From: bethlehem, PA Member No.: 4,089 ![]() |
Using specific gravity. {(Starting gravity) minus (Finishing gravity)} divided by 7.5=alcohol by volume
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