In order to calculate return on investment ratio follow the link: http://www.financialratioss.com/profitability-ratios/return-on-investment More info on other financial ratios can be found here: http://www.financialratioss.com Full description: What is return of investment? Return of investment (ROI) is a measure which evaluates the efficiency of investment. This is very popular and often used ratio. Common Norms and limitations: Negative value of return of investment shows an unprofitable use of company's assets. While evaluating company's activity it is important to realize that ROI is only one of many financial ratios and relying only on it would not be recommended. How to calculate return of investment? Data to calculate this measure is collected from the income statement. It is worth mentioning that this ratio can be calculated in many ways but mostly two of it is used in practice. ROI can be calculated to evaluate the whole activity of a company and of separate project as well.