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You will need a hydrometer to measure the Original gravity of the wine (taken at 70 degrees F) before pitching the yeast. The final gravity (after fermentation) is then taken also using a hydrometer at the same 70 degrees F temperature. The difference between the two readings is multiplied by 131 and the answer is recorded as a percentage. Example Original gravity (1.048) - Final Gravity (1.101) = 6.943 or 7% ABV. If you want to know the Percent alcohol by Weight you multiply the ABV by 1.25. If you have the ABW and want the ABV, myltiply the ABW by .8.

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