Water To Add
22.00 fl oz
Final Volume
38.00 fl oz
Target ABV
40.0%
Add This Much Water
22.00
fl oz
Final Volume
38.00 fl oz
Current ABV
95.0%
Target ABV
40.0%
Water Ratio
1 : 1.38
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Result
This is a common use case for bringing neutral spirit down to standard bottling or infusion strength.
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Result
Bringing overproof rum or grain alcohol down to standard 80 proof roughly doubles the volume. This is useful for making cocktail-strength infusions.
Use conservation of alcohol: the amount of pure alcohol stays the same before and after dilution. That lets you solve for how much water to add based on the current proof, target proof, and starting volume.
Yes. The same dilution math works for neutral spirits, tinctures, and infused alcohol as long as you are tracking proof and volume in the same unit system.
In the United States, proof is simply twice the ABV percentage. An 80 proof spirit is 40 percent ABV. The proof system dates back to testing alcohol with gunpowder, and the US standardized the 2x relationship in 1848.
For best results, add water to the spirit gradually rather than adding spirit to water. Mix gently and let the solution rest for a day or two if possible, since alcohol and water contract slightly when combined and the final volume can be a tiny bit less than expected.
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Last Updated: Jul 13, 2026
This calculator is provided for informational and educational purposes only. Results are estimates and should not be considered professional financial, medical, legal, or other advice. Always consult a qualified professional before making important decisions. UseCalcPro is not responsible for any actions taken based on calculator results.