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Spirit Dilution Calculator

Calculate water addition to reduce spirit proof. Enter current ABV/volume and target ABV to get exact water needed.

Inputs

ml

Volume of spirit before dilution

%

Current alcohol by volume percentage

%

Desired alcohol by volume percentage after dilution

Results

Water to Add

469 ml

Final Volume

1219 ml

Proof Change50 proof points (130 → 80)
Ethanol-water contraction: actual final volume will be ~19 ml less than calculated (4.0% contraction). Add water gradually and measure proof to hit your target exactly.

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Tips

1
Add water slowly and stir gently. Rapid dilution can cause louche (haziness) in some spirits.
2
Use distilled or reverse-osmosis water for the cleanest result.

Open formula

Water (ml) = Volume × (Current ABV / Target ABV - 1)

Simple dilution formula calculates water needed to reach target ABV.

Actual final volume is slightly less than predicted due to ethanol-water contraction (~3-4% at typical dilution ratios).

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