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Calculate Future Value with Recurring Deposits
Using the following values: The formula for the future value of an annuity due is d*(((1 + i)^t - 1)/i)*(1 + i) See Calculating The Present And Future Value Of Annuities In an annuity due, a deposit is made at the beginning of a period and the interest is received at the end of the period.  This is in contrast to an ordinary  annuity, where a payment is made at the end of a period. The formula is derived, by induction , from the summation of the future values of every deposit.  The initial value, with interest accumulated for all periods, can simply be added. So the overall formula is