How does this converter compute UK Proof to ABV Percent?

Both scales are normalized through ABV percent, then converted using a fixed ratio.

Is the mirror direction available?

Yes. Use the switch button or open the ABV Percent to UK Proof page.

Yes. Decimal strength values are supported for lab, labeling, and mixology use cases.

1 UK Proof = 0.5715 ABV Percent · fixed factor via canonical reference constants · no offset

1 UK Proof equals 0.5715 ABV Percent

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

For 0.25 UK Proof, the result equals 0.142875 ABV Percent.

UK Proof (proof (UK))

1 UK Proof (proof (UK)) =
0.5715 ABV Percent (% ABV)

Multiply by 0.5715 because 1 proof (UK) corresponds to 0.5715% ABV and 1 % ABV corresponds to 1% ABV. 100 UK proof equals 57.15% ABV.

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

The same constants drive calculator output and common-value rows, so quick checks and manual calculations remain consistent.

Method basis: UK Proof to ABV Percent uses the page-specific conversion model shown in Direct Answer.
Applied factor: 1 UK Proof = 0.5715 ABV Percent (as defined for this route).
Consistency rule: calculator output and table values use the same constants and rounding policy.