Share | Dollar-cost Averaging Calculator Help Quote Symbol: Be sure to use Yahoo! Finance symbol naming conventions when you enter a stock symbol on the form. For example, enter ^GSPC for S&P 500 prices. If you enter an invalid code, the displayed results will be meaningless. See tables of Yahoo! Finance index symbols for U.S. and world markets. Initial Investment Amount: Use any dollar amount but do not include $ or commas. Enter 0 if you do not want an initial investment. The initial investment is made on the first date. The first dollar-cost average investment (recurring investment) starts one month after the initial investment. Recurring Investment Amount: Use any dollar amount but do not include $ or commas. Recurring Investment Interval (Months): The monthly interval for recurring investments. Enter 1 to invest each month; enter 2 to invest every other month and so on. First Date: Enter the month and year for the first investment. Last Date: Enter the month and year for the last investment. Be sure that the last investment date is later than the first investment date. And the last date must be the current date or prior to it since there are no prices beyond the current date in the Yahoo! Finance price database. Important Note About Dates Computations are based on monthly closing prices taken from Yahoo! Finance. For the selected stock, check for the date that prices begin at Yahoo! Finance. Be sure that your first date of dollar-cost averaging (recurring investment) is on or after the first date in the Yahoo! Finance price database. If you select a date that is earlier than the beginning date in the Yahoo! Finance price database, the calculator sets the first date of dollar-cost averaging to the first date in the Yahoo! Finance price database. Computation Procedures All prices are from Yahoo! Finance and have been adjusted for splits and dividends. Adjusted prices values are lower than unadjusted prices. All computations are based on monthly closing adjusted prices. The number of shares purchased for each recurring investment is based on the monthly close of the specified stock and the amount of the recurring investment. For example, a $1,000 investment at $20 per share would buy 50 shares for that month. The number shares purchased for each recurring investment are summed to give the total number of shares purchased at the end of the investment period. Final value of all shares is the number of initial shares plus the total number of shares purchased from all recurring investments during the dollar-cost-averaging period multiplied by the closing price of the last date.