Alcohol DilutionUK Proof to US Proof

UK Proof to US Proof for Alcohol Strength

Methodology·How We Verify

Snapshot

1 UK Proof equals 1.143 US Proof.

Reference basis: This result uses fixed ABV and proof definitions for the selected alcohol-strength pair.
Example: For 0.25 UK Proof, the result equals 0.28575 US Proof.

Interactive conversion

Converter Calculator

Decimals: 1.5 or 1,5. Fractions: 1/2. Scientific notation: 1e3. Write 1000 without grouping separators.

1.143 US Proof (proof (US))

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API and AI agent access

UK Proof to US Proof for Alcohol Strength.

Machine-readable identifiers

Conversion family: alcohol-dilution
Source unit: uk_proof
Target unit: us_proof

Use these identifiers in the API request. Sources and model limits also apply to software clients.

Example API request and response

POST /api/v1/convert

Request

{
  "family": "alcohol-dilution",
  "value": 1,
  "from": "uk_proof",
  "to": "us_proof"
}

Essential response

{
  "ok": true,
  "conversion": {
    "family": "alcohol-dilution",
    "value": 1,
    "from": "uk_proof",
    "to": "us_proof",
    "result": {
      "raw": 1.143,
      "display": "1.143"
    },
    "canonicalPath": "/alcohol-dilution/uk-proof-to-us-proof/"
  }
}

API, OpenAPI and WebMCP documentation

Explanation

The converter converts uk proof into us proof by normalizing both strength scales through ABV percent. Formula: proof (US) = proof (UK) × 1.143. Both directions stay aligned because the calculator, common values, and mirror page all use the same ABV-based relationship. 100 UK proof equals 57.15% ABV. US proof is defined as 2 times ABV.

This is the practical way to compare labeling systems such as ABV, US proof, UK proof, and related fractional strength formats without mixing incompatible proof definitions.

Method & Strength Basis

Method basis: fixed alcohol-strength definitions normalized through ABV percent, including the exact US and UK proof relationships used on this page.
Applied factor: 1 UK Proof = 1.143 US Proof.
Consistency rule: calculator output and common-value rows use the same ABV-based strength constants in both directions.

Common Conversion Values

UK Proof (proof (UK))	US Proof (proof (US))
1/4	0.28575
1/2	0.5715
1	1.143
5	5.715
12	13.716
20	22.86
40	45.72
57.15	65.32245
80	91.44
100	114.3

Questions & answers

Frequently Asked Questions

Why does this route go through ABV percent?

ABV percent is the common reference layer for this family, so proof, fraction, and per-mille strength values stay consistent and reversible.

How do I reverse UK Proof to US Proof?

Use the switch button or open the US Proof to UK Proof page to apply the same alcohol-strength relationship in reverse.