Proof to ABV Converter
Convert between alcohol proof and ABV for US and UK scales by selecting the direction and system.
CalcSimpler Examples
- 80 proof with mode 1 on the US scale ⇒ 40.00 % ABV
- 45% ABV with mode 2 on the UK scale ⇒ 78.75 proof
FAQ
Which proof system should I choose?
Select 1 for the modern US proof system or 2 for the historic UK proof degrees used on some spirits references.
Can I use decimal values?
Yes, enter fractional proof or ABV values for more precise conversions.
What happens if I pick the wrong mode?
The calculator will return the opposite unit, so ensure mode 1 is for proof to ABV and mode 2 is for ABV to proof.
Additional Information
- The United States defines proof as twice the ABV, while the historic UK scale multiplies ABV by 1.75.
- Use mode 1 to convert labeled proof to drinking strength, or mode 2 to estimate proof from a lab ABV result.
CalcSimpler