To figure your total return percentage, divide the total return by the amount invested and multiply the result by 100. For example, if you have a $300 gain and a $4,900 initial investment, divide $300 by $4,900 to get 0.0612 and multiply by 100 to get a total return of 6.12 percent. Total Return Index Calculation Methodology Total return Index measures market performance, including price movements (capital gain/loss), rights offered to current shareholders allowing them to purchase additional shares, usually at a discount to market price (rights offering), and income from dividend payments (dividends) assuming I have the Total Return Index(RI) for several companies. Calculate the total returns from the total return index [closed] Ask Question Is it possible to do an event study by taking the Total Return Index to calculate the total returns and compare them to a stock index such as the dax