This calculator calculates the amounts of two starting solutions of given concentration needed to be mixed together to obtain the final solution requirements. Volume or weight of Isopropyl Alcohol ((CH₃)₂CHOH) solution may be used. Just click on the weight or volume button to change to volume or weight units (Click here for illustration). To use water for diluting an Isopropyl Alcohol solution just input its concentration as zero percent (as in no Isopropyl Alcohol content). The calculator uses a table (see Examples) of concentration (% Isopropyl Alcohol 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 Isopropyl Alcohol 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 Isopropyl Alcohol. Click on the "Use Percent Volume Isopropyl Alcohol" 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. This calculator accounts for volume contraction that results when mixing Isopropyl alcohol and water.