Alcohol Dilution Calculator
Calculate how much water to add to dilute spirits to a target ABV.
The Alcohol Dilution Calculator determines how much water to add to reduce the alcohol content of a spirit to your desired strength. This is commonly used in home distilling, cocktail preparation, and proofing spirits.
Enter the current volume (mL), current ABV (alcohol by volume percentage), and target ABV. The calculator uses the simple dilution formula to compute the final volume and the amount of water to add.
Note that mixing alcohol and water produces a slight volume contraction (the final volume may be slightly less than expected). This calculator provides theoretical values that are very close for most practical purposes.
Frequently Asked Questions
What is ABV?
ABV (Alcohol By Volume) is the percentage of pure alcohol in a liquid. For example, 40% ABV means 40% of the liquid is pure ethanol.
Why dilute spirits?
Distillers dilute high-proof distillate to bottle strength (typically 40% ABV). Bartenders dilute to achieve optimal flavor in cocktails.
Does temperature matter for dilution?
Yes. Alcohol is typically measured at 20 degrees C (68F). Temperature affects alcohol density and volume, so measure at a consistent temperature for accuracy.