Alcohol Dilution Calculator

Your details

Dilute mode: add water to a spirit. Blend mode: mix two spirits of different strengths.
Volume of the spirit you are starting with.
mL
Alcohol by volume of your starting spirit. Check the bottle label.
%
The ABV you want to reach after dilution.
%
Use 0% for plain water. Enter a percentage to dilute with a lower-strength spirit instead.
%
Alcohol and water molecules pack together slightly, shrinking the final volume. Enable for precise results.
Water to add
500mL

Volume of water (or diluent) to add to reach your target ABV.

Final volume1,490.3mL
Contraction loss9.8mL
Proof (US)80
Dilution ratio2.0:1 (spirit:water)
80 proof
Low (under 20% ABV)<40Light (20-40% ABV)40-80Standard (40-60%)80-120High (60-80%)120-160Overproof (80-100%)160+

Add 500.0 mL of water to 1000 mL of 60% spirit.

  • Add 500.0 mL of water to reach 40% ABV (80 proof US).
  • Alcohol contraction reduces the actual final volume by about 9.8 mL.
  • Final volume will be approximately 1490 mL.
  • You are reducing strength by 20.0 percentage points.

Next stepMeasure water carefully using a digital scale (1 g of water = 1 mL) for the most accurate results. Mix gently and allow to rest before measuring ABV.

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