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Alcohol Dilution Calculator

Alcohol content

🥃 Strong alcohol (% ABV) ? 💧 Water / weak alcohol (% ABV) ? 🎯 Target (% ABV) ?

Alcohol volume

⚗️ Strong alcohol volume ?

💧 Water / weak alcohol to add ?

📦 Final volume (approx.) ?

Show contraction estimate ?

Show step-by-step derivation

References & notes

Conservation of absolute alcohol (Pearson’s square / “cross” method). Suitable when diluting a stronger spirit with water or weaker spirit.
Volume contraction on mixing water–ethanol is real; estimates shown are approximate around ~20 °C (consult alcoholometric tables for precision).

Approx. contraction per 1 L mixture vs target ABV (mL, ~20 °C)
ABV (%)	10	20	30	35	40	50	60	70	80	90
Contraction (mL)	6	15	24	26	29	31	31	27	20	10

For rigorous work, use official alcoholometric tables at your process temperature.

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