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ABW from ABV Calculator

Enter the alcohol by volume (% ABV) to get the alcohol by weight (% ABW).

How it is calculated

Enter the strength as a percentage by volume, ABV, from 0 to 100. The tool multiplies it by a fixed factor: ABW = ABV × 0.79336, and shows the answer as a percentage with two decimals. The factor reflects that ethanol is less dense than water, so a given volume of alcohol weighs less than the same volume of the drink as a whole.

The conversion is a straight-line approximation with one constant, so every input is scaled the same way: 10% ABV gives exactly twice the ABW of 5% ABV. Values below 0 or above 100 return no result. The tool does not ask for temperature or sugar content, which shift the true density of a real beverage slightly.

Worked example

A beer labelled 5% ABV. Multiply: 5 × 0.79336 = 3.9668. Rounded to two decimals, the result is 3.97% ABW. A wine at 12.5% ABV works out as 12.5 × 0.79336 = 9.917, shown as 9.92%.

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Common mistakes

  • Comparing an ABW figure with an ABV figure directly. A beer at 4% ABW is about 5% ABV, so the same drink looks weaker or stronger depending on which scale is quoted.
  • Dividing when you should multiply. To go from ABV to ABW you multiply by 0.79336; going the other way you would divide.
  • Entering the value as a fraction, such as 0.05 for 5%. The tool expects the percentage number itself and would give 0.04%.
  • Treating the result as exact. It uses a single fixed factor, so it is an estimate for the drink, not a lab measurement.
  • Confusing ABW with proof. Proof is a separate scale and is not what this tool returns.

About this calculator

This calculator converts alcohol by volume (ABV) to alcohol by weight (ABW) using ABW ≈ ABV × 0.79336, the factor derived from ethanol's density relative to the finished beverage — since alcohol is lighter than water, a given percentage by volume always corresponds to a smaller percentage by weight.

Brewers use this conversion because US beer labeling has historically shown ABW while most of the world (and most consumers) think in ABV, so the two figures need to be reconciled to compare beers across labeling conventions or meet a state's specific alcohol-content disclosure rules. The 0.79336 factor is an approximation that holds reasonably well for beer-strength beverages but drifts slightly at very high ABV.

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Comments (1)

  • Editorial team

    The single constant is a good fit for beer and wine but less so for strong spirits, where the drink's own density is further from water. A 40 percent ABV spirit comes out at 31.73 percent ABW here, and a proper density table would show a noticeably higher figure. If a US recipe or label quotes ABW, convert it back before comparing with ABV strengths elsewhere. Which drink are you converting?

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