Reference

Proof to ABV Tables

US proof conversions in both directions, plus the interactive converter for any value.

US proof is exactly twice the alcohol by volume. To read ABV from proof, divide by 2. To read proof from ABV, multiply by 2. Pick a common value below, or open the interactive converter for any number, including conversions to the separate UK proof scale.

These reference values cover the proof and ABV figures most commonly printed on spirit labels and referenced in recipes. For anything outside this list, or for UK Sikes proof conversions, the interactive converter linked above handles any value directly.

Open the interactive Proof Converter

Confirm the real strength: proof printed on a label is one thing, the spirit in your jar is another. A 0 to 200 proof alcoholmeter reads it directly at 20°C.

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Frequently Asked Questions

On the US scale, divide the proof by 2. US proof is defined as exactly twice the alcohol by volume, so 100 proof is 50% ABV.

Multiply the ABV by 2 on the US scale. A spirit at 40% ABV is 80 proof.

No. UK (Sikes) proof and US proof are defined differently and don't convert with the same simple factor. 100 UK proof corresponds to about 57.1% ABV, not 50%, since the UK scale was historically defined around the specific gravity of a spirit-water mixture rather than a clean doubling of ABV. The UK scale has been largely superseded by ABV labelling but still appears in some older references.

The modern US definition ties proof directly to ABV by regulation, defining proof as exactly double the alcohol by volume at 60F. This replaced an older, less precise historical definition and makes the US scale simple to convert in either direction with no rounding or lookup table needed.

Most spirits sold for drinking sit between 80 and 100 proof, corresponding to 40-50% ABV, which is also the range most jurisdictions set as a legal minimum for products labelled as spirits. Cask-strength or barrel-proof releases are often considerably higher, sometimes 120-140 proof or more.

References

Primary and peer-reviewed sources for the technical claims on this page.

  1. U.S. Alcohol and Tobacco Tax and Trade Bureau, 27 CFR 30.11 (eCFR). Gauging Manual: Meaning of terms. Cited for: Proof is legally defined as the ethyl alcohol content of a liquid at 60°F, stated as twice the percent of ethyl alcohol by volume.
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