We need calculators on a regular basis in order to simplfy the complex process of calculating. Return on Investment (ROI) calculator provides for the same. We have simplified the entire process of calculating Return on Investment (ROI). All you have to do is provide the input values and hit calculate. You will get the answer for Return on Investment (ROI) without getting into the complex process of actually calculating anything. The definitions and meanings of all variables used in the formula are also provided. If you don’t have the values of all variables and you need to calculate some, even that is possible as we provide you different variants and derived formulae as well.