Enter the original gravity and final gravity into the calculator to determine the Alcohol by Volume (ABV). This calculator can also evaluate any of the variables given the others are known.

Alcohol by Volume (ABV) Calculator

Results are estimates based on hydrometer readings. U.S. proof = 2 × ABV%.

Enter any 2 values to calculate the missing variable

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Alcohol by Volume (ABV) Formula

The following formula is used to calculate the Alcohol by Volume (ABV). 

ABV = (OG - FG) * 131.25

Note: This equation is a common brewing approximation for fermented beverages based on hydrometer readings and provides an estimate. For best accuracy, correct hydrometer readings for temperature; results may be less accurate for very high gravities and are not intended for distilled spirits.

Variables:

  • ABV is the Alcohol by Volume (%)
  • OG is the original gravity (specific gravity before fermentation)
  • FG is the final gravity (specific gravity after fermentation)

To calculate the Alcohol by Volume, subtract the final gravity from the original gravity. Then, multiply the result by 131.25. The result is the Alcohol by Volume expressed as a percentage.

What is Alcohol by Volume (ABV)?

Alcohol by Volume (ABV) is a standard measure used worldwide to quantify the amount of alcohol (ethanol) contained in an alcoholic beverage. It is expressed as a percentage that represents the volume of pure ethanol as a proportion of the total volume of the beverage. For example, a beverage with an ABV of 5% means that 5% of the total volume of the beverage is pure alcohol. This measure helps consumers understand the strength of the alcoholic beverage.

How to Calculate Alcohol by Volume (ABV)?

The following steps outline how to calculate the Alcohol by Volume (ABV) using the formula: ABV = (OG – FG) * 131.25

  1. First, determine the original gravity (OG) and the final gravity (FG) of the alcohol.
  2. Next, subtract the final gravity (FG) from the original gravity (OG).
  3. Multiply the difference by 131.25.
  4. Finally, calculate the Alcohol by Volume (ABV).
  5. After inserting the values and calculating the result, check your answer with the calculator above.

Example Problem:

Use the following variables as an example problem to test your knowledge:

Original gravity (OG) = 1.050

Final gravity (FG) = 1.010