Proof & ABV Converter

Convert between proof, ABV (alcohol by volume), and specific gravity. Supports US proof and UK proof (Sikes).

Inputs

Input Value

Input Unit

Tab to move between fields

Results

US Proof

80°

ABV

40%

Specific Gravity0.68

UK Proof (Sikes)91.43°

How to Use This Calculator

Enter a value in your current unit (US proof, ABV percentage, specific gravity, or UK proof).
Select the input unit from the dropdown.
The calculator instantly converts to all other measures: US proof, ABV%, specific gravity, and UK Sikes proof.
Use the correct unit for your jurisdiction's labeling requirements or import/export documentation.

How the result changes with Input Value

Input Value	US Proof	ABV
20	20°	10%
70	70°	35%
130	130°	65%
180	180°	90%

What each input means

Input Value: The value to convert. Enter proof (0-200), ABV% (0-100), or specific gravity (0.78-1.00).
Input Unit: Unit of the input value: 1 = US Proof, 2 = ABV%, 3 = Specific Gravity.

How this is calculated

Worked example, using the default values

Identify Input Parameters
Input Value = 80, Input Unit = 1 = 2 input(s) provided
Calculate US Proof
US Proof
80 = 80
Calculate ABV
ABV
40 = 40
Calculate Specific Gravity
Specific Gravity
0.6835 = 0.6835
Calculate UK Proof
UK Proof
91.43 = 91.43

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