Alcohol Dilution Calculator
Calculate how much water to add to dilute spirits to a target ABV.
Enter current ABV, target ABV, and volume for instant results.
Enter your spirit details — see how much water to add.
Dilution Results
Dilution formula for reducing alcohol by volume (ABV).
The formula:
- Water to add = Volume x (Current ABV / Target ABV - 1)
Example:
- You have 750 ml of spirit at 60% ABV
- You want to dilute to 40% ABV
- Water needed: 750 x (60/40 - 1) = 750 x 0.5 = 375 ml
- Final volume: 1,125 ml at 40% ABV
Common dilution scenarios:
- Cask strength whiskey (55-65%) to drinking strength (40-46%)
- High-proof spirits (75%) to bottling proof (40%)
- Homebrew spirits to desired strength
Notes:
- Use distilled or filtered water for best results.
- Mix slowly and let rest before measuring final ABV.
- Temperature affects density — measure at room temperature.
- There is slight volume contraction when mixing alcohol and water.