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Calcimator

Spirit Dilution Calculator

Calculate how much water to add to dilute a spirit from its current ABV to a target ABV for proofing down.

Inputs

cup
%
%

Results

Water to Add

625 mL

≈ 2 soda cans

Final Volume (theoretical)1,625 mL
Final Volume (adjusted for contraction)1,576 mL
Current Proof130°
Target Proof80°
How to Use This Calculator
  1. Enter the spirit volume in mL or liters.
  2. Set the current ABV and target bottling ABV (e.g., 40% for 80 proof).
  3. The calculator shows water to add in mL, theoretical and contraction-adjusted final volume, and current and target proof.
  4. Add the calculated water slowly while stirring, then re-measure proof to confirm before bottling.

How the result changes with Target ABV

Target ABVWater to Add
192,421 mL
40625 mL
650 mL
870 mL

What each input means

Spirit Volume
Volume of the undiluted spirit in milliliters.
Current ABV
Current alcohol by volume of the spirit. Fresh distillate from a pot still is typically 60-70%.
Target ABV
Desired final ABV. 40% (80 proof) is the US minimum for most spirits. Cask strength is typically 50-65%.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    Spirit Volume = 1000, Current ABV = 65, Target ABV = 40 = 3 input(s) provided
  2. Calculate Water to Add
    Water to Add = Math
    625 = 625
  3. Calculate Final Volume
    Final Volume
    1625 = 1625
  4. Calculate Final Volume
    Final Volume
    1576 = 1576

Engine last updated . Checked against 2 independently-derived tests — how we verify calculators.

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