What formula is used for ABV Percent to UK Proof?

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 UK Proof to ABV Percent page.

Can I use decimal inputs?

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

% ABV to proof (UK)

1 ABV Percent = 1.749781 UK Proof · fixed factor via canonical reference constants · no offset

Direct Answer

1 ABV Percent equals 1.749781 UK Proof

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

For 0.25 ABV Percent, the result equals 0.437445 UK Proof.

Converter Calculator

ABV Percent (% ABV)

1 ABV Percent (% ABV) =
1.749781 UK Proof (proof (UK))

Explanation

Multiply by 1.74978127734 because 1 % ABV corresponds to 1% ABV and 1 proof (UK) corresponds to 0.5715% ABV. 100 UK proof equals 57.15% ABV.

ABV Percent to UK Proof follows one canonical fixed-factor definition tied to canonical reference constants, keeping calculator output and table values aligned.

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

Method & Reference (Verified)

Method basis: ABV Percent to UK Proof uses the page-specific conversion model shown in Direct Answer.
Applied factor: 1 ABV Percent = 1.74978127734 UK Proof (as defined for this route).
Consistency rule: calculator output and table values use the same constants and rounding policy.

Common Conversion Values

ABV Percent (% ABV)	UK Proof (proof (UK))
0.25	0.437445
0.5	0.874891
1	1.749781
5	8.748906
12	20.997375
20	34.995626
40	69.991251
57.15	100
80	139.982502
100	174.978128