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Ok, so you forgot to take an original gravity reading (O.G.).

Hopefully you brewed with a kit or a recipe that tells you the anticipated O.G. Get that number and then when your homebrew finishes get the final gravity reading (F.G.).

Calculate the alcohol percentage with this calculation:

% ABV = ((anticipated O.G.) - (F.G.)) / (specific gravity of ethanol)

% ABV = ((anticipated O.G.) - (F.G.)) / 0.789

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13y ago

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