How is US Proof to ABV Per Mille calculated?

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 Per Mille to US Proof page.

Can I use decimal inputs?

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

proof (US) to permille

1 US Proof = 5 ABV Per Mille · fixed factor via canonical reference constants · no offset

Direct Answer

1 US Proof equals 5 ABV Per Mille

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

For 0.25 US Proof, the result equals 1.25 ABV Per Mille.

Converter Calculator

US Proof (proof (US))

1 US Proof (proof (US)) =
5 ABV Per Mille (permille)

Explanation

Multiply by 5 because 1 proof (US) corresponds to 0.5% ABV and 1 permille corresponds to 0.1% ABV. US proof is defined as 2 times ABV. Per mille here means parts per thousand of ABV by volume.

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

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 Per Mille uses the page-specific conversion model shown in Direct Answer.
Applied factor: 1 US Proof = 5 ABV Per Mille (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 Per Mille (permille)
0.25	1.25
0.5	2.5
1	5
5	25
12	60
20	100
40	200
57.15	285.75
80	400
100	500