proof (US) to fraction

1 US Proof = 0.005 ABV Fraction · fixed factor via canonical reference constants · no offset

Direct Answer

1 US Proof equals 0.005 ABV Fraction

This conversion uses a fixed factor based on canonical reference constants.

For 0.25 US Proof, the result equals 0.00125 ABV Fraction.

Converter Calculator

1 US Proof (proof (US)) =
0.005 ABV Fraction (fraction)

Explanation

Multiply by 0.005 because 1 proof (US) corresponds to 0.5% ABV and 1 fraction corresponds to 100% ABV. US proof is defined as 2 times ABV. ABV fraction is a 0 to 1 scale where 1 equals 100% ABV.

From US Proof to ABV Fraction, the calculator applies one stable fixed-factor model derived from canonical reference constants.

Read more

Table rows are generated from the same conversion constants used by the live calculator to maintain deterministic results.

Method & Reference (Verified)

  • Method basis: US Proof to ABV Fraction uses the page-specific conversion model shown in Direct Answer.
  • Applied factor: 1 US Proof = 0.005 ABV Fraction (as defined for this route).
  • Consistency rule: calculator output and table values use the same constants and rounding policy.

Common Conversion Values

US Proof (proof (US))ABV Fraction (fraction)
0.25 0.00125
0.5 0.0025
1 0.005
5 0.025
12 0.06
20 0.1
40 0.2
57.15 0.28575
80 0.4
100 0.5