This app calculates the amount of water to dilute a known volume and percentage of alcohol. The user enters the number of liters or gallons of the sample to be diluted, the known alcohol percentage of the sample, and the desired final alcohol percentage. The app will then calculate the amount of water to add in gallons or liters. Calculations are based on density values at 20 degrees Celsius from the International Alcoholometric Tables - OIML. Results are approximate values only, but are significantly more accurate than standard dilutions equations. Care should be taken to prevent over-dilution of your spirits.