UK Proof to US Proof for Alcohol Strength
1 UK Proof equals 1.143 US Proof using fixed ABV and proof definitions used in beverage labeling and spirits references.
Direct Answer
1 UK Proof equals 1.143 US Proof
This result uses fixed ABV and proof definitions for the selected alcohol-strength pair.
For 0.25 UK Proof, the result equals 0.28575 US Proof.
Converter Calculator
1.143 US Proof (proof (US))
SwitchExplanation
Formula: US Proof = UK Proof × 1.143. Why: proof scales are normalized through ABV percent using fixed legal definitions, including US proof = 2 times ABV and 100 UK proof = 57.15% ABV.
UK Proof (proof (UK)): a historical proof scale where 100 proof equals 57.15% ABV.
US Proof (proof (US)): a spirits-strength scale defined as exactly 2 times ABV percent.
This route is useful when translating between ABV and proof systems for beverage labeling, spirits references, and dilution planning.
This conversion is purely multiplicative because both strength scales reduce through ABV percent using fixed proof and fractional definitions with no offset.
Common Conversion Values
| UK Proof (proof (UK)) | US Proof (proof (US)) |
|---|---|
| 0.25 | 0.28575 |
| 0.5 | 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 |
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.
Can I use decimal inputs?
Yes. Decimal strength values are supported for beverage labeling, spirits references, lab work, and batching calculations.