Calculate the alcohol by volume of your wine using original gravity (OG) and final gravity (FG) readings from your hydrometer.
Reading before fermentation
Reading after fermentation
ABV
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Attenuation
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Alt. ABV
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💡 The simple formula (OG − FG) × 131.25 is accurate for most home wines up to ~15% ABV. The alternate formula (shown right) is more accurate for higher gravity wines.