This calculator can be used for making a Solution with the desired concentration of Ethanol, for adjusting the Ethanol concentration of a Solution, and for mixing Solutions with known concentration of Ethanol. Please enter any four values and leave the values to be calculated blank. Volume or weight of Solution may be used. Just click on the "Weight" or "Volume" button to change to volume or weight units (Click here for illustration). Concentration may be expressed in percent by weight or percent by volume Ethanol. To use water for diluting an Ethanol solution just input its concentration as zero percent (as in no Ethanol content). The calculator uses a table (see Examples) of concentration (% Ethanol by weight or volume) and its equivalent density. Interpolation is used to compute density values that are between the values in the table. The density is then used to compute volume or weight as needed. The Ethanol in water density-concentration table was taken from "Perry's Chemical Engineers' Handbook" by Robert H. Perry, Don Green, Seventh Edition. This calculator includes the choice of expressing concentration in % Volume Ethanol. Click on the "Use Percent Volume Ethanol" button to switch to % Volume. Please be careful that the correct volume or weight units and the correct concentration expression (% Volume or % Weight) are used in your application.