How to calculate return on investments? 1.33K viewsCorporate Finance 0 Guest60 0 Comments What ‘s the return on investments formula that I can use for some simple calculations? 1 Answer ActiveVotedNewestOldest 0 Guest60 Posted 0 Comments The formula is very straightforward: Return on Investment = (Gain from the investment-Cost of the investment)/Cost of the investment. For example, if you expect $120 return and the cost is $100, then the ROI is (120-100)/100 or 20%. Register or Login Search for: