US Proof to ABV Fraction for Alcohol Strength
1 US Proof equals 0.005 ABV Fraction using fixed ABV and proof definitions used in beverage labeling and spirits references.
Direct Answer
1 US Proof equals 0.005 ABV Fraction
This result uses fixed ABV and proof definitions for the selected alcohol-strength pair.
For 0.25 US Proof, the result equals 0.00125 ABV Fraction.
Converter Calculator
0.005 ABV Fraction (fraction)
SwitchExplanation
Formula: ABV Fraction = US Proof × 0.005. 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.
US Proof (proof (US)): a spirits-strength scale defined as exactly 2 times ABV percent.
ABV Fraction (fraction): a 0-to-1 alcohol-strength representation where 1 equals 100% ABV.
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
| US Proof (proof (US)) | ABV Fraction (fraction) |
|---|---|
| 0.25 | 0.00125 |
| 0.5 | 0.0025 |
| 1 | 0.005 |
| 5 | 0.025 |
| 12 | 0.06 |
| 20 | 0.1 |
| 40 | 0.2 |
| 57.15 | 0.28575 |
| 80 | 0.4 |
| 100 | 0.5 |
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 US Proof to ABV Fraction?
Use the switch button or open the ABV Fraction to US 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.