Work out alcohol blending (proof gallons) instantly with clear inputs, formula shown and shareable results.
A proof gallon is one US gallon at 100 degrees proof, which is 50% alcohol by volume. Proof gallons equal wine gallons times proof divided by 100, and excise duty is assessed on proof gallons. Gauging must be corrected to the reference temperature of 60 F using the official tables.
Proof gallons
Proof gallons = wine gallons x proof / 100
Proof and ABV
ABV % = proof / 2 (US convention)
Excise gauging and duty calculation must follow the official tables and procedures of the tax authority. Errors in proof gallon determination create duty liabilities and penalties.
Simply a gallon of liquid volume regardless of strength, as opposed to a proof gallon which is volume adjusted for alcohol content. Duty is on proof gallons, inventory is often in wine gallons.
No. US proof is twice ABV. Historical UK proof was different, with 100 degrees proof equal to 57.15% ABV, and the UK now uses ABV directly. Always state the convention.