These reference pages show exactly how much water to add to bring a spirit from a given strength down to a target ABV, using the standard volume method. Each links through to the interactive ABV Dilution Calculator for custom volumes and OIML-precise mode.
The figures below are given per litre of starting spirit, so they scale directly with batch size. They cover the most commonly diluted strength pairs, from high-proof new-make spirit down to standard bottling strengths like 40%, 43%, 46% and 50% ABV.
Diluting to 40% ABV
43% → 40% ABV
Add ~75 mL water per litre
50% → 40% ABV
Add ~250 mL water per litre
55% → 40% ABV
Add ~375 mL water per litre
57.5% → 40% ABV
Add ~438 mL water per litre
60% → 40% ABV
Add ~500 mL water per litre
63% → 40% ABV
Add ~575 mL water per litre
65% → 40% ABV
Add ~625 mL water per litre
70% → 40% ABV
Add ~750 mL water per litre
75% → 40% ABV
Add ~875 mL water per litre
80% → 40% ABV
Add ~1000 mL water per litre
Diluting to 43% ABV
50% → 43% ABV
Add ~163 mL water per litre
55% → 43% ABV
Add ~279 mL water per litre
60% → 43% ABV
Add ~395 mL water per litre
63% → 43% ABV
Add ~465 mL water per litre
Diluting to 46% ABV
55% → 46% ABV
Add ~196 mL water per litre
60% → 46% ABV
Add ~304 mL water per litre
63% → 46% ABV
Add ~370 mL water per litre
65% → 46% ABV
Add ~413 mL water per litre
Diluting to 50% ABV
60% → 50% ABV
Add ~200 mL water per litre
63% → 50% ABV
Add ~260 mL water per litre
65% → 50% ABV
Add ~300 mL water per litre
70% → 50% ABV
Add ~400 mL water per litre
Diluting to 57.5% ABV
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