AustraliaTier 1
ABV to proof calculator
US proof is exactly twice ABV. Enter either value — the other updates live.
Free·No sign-up·Last checked 2026-08-27
Formula
Proof = ABV × 2ABV = Proof ÷ 2Worked example. 40% ABV × 2 = 80 proof. 100 proof ÷ 2 = 50% ABV.
Questions
No — Australian labels state ABV only. Proof sometimes appears on imported US spirits, which is why this converter is useful even though it's not a local labelling requirement.
No. US proof is exactly twice ABV. The old imperial proof scale used by the UK and Australia before metrication was roughly 1.75× ABV and was retired decades ago in favour of ABV — this calculator is US proof only.