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The concept of future value is related to time value of money. For example, if you deposit your money in a bank as a savings account or a fixed deposit account for a certain period of time, you will earn a certain amount of money based on the compound interest computed periodically, and this amount is added to the principal if you continue to keep the money in the bank. Interest for the following period is now computed based on the initial principal plus the interest (the amount which becomes your new principal). Subsequent interests are computed in the same way.
In our Future Value Calculator, we are given a known present value and we want to calculate how much will be the future value after a numbers of years compounded upon a certain interest rate. In that example, we use the formula
FV = PV * (1 + i / 100)^{n}
To calculate the future value. However, in this example, we already has a target future value in mind and we wish to know how much money we need to invest to achieve the target based on a certain interest. Though we still can employ the same basic formula, this time we preferred to use the VB builtin present value function, or PV.
The syntax of the PV function is
PV(Rate,Nper, Pmt,FV,Due)
Rate=Interest rate
Nper=The length of period (Usually number of years)
Pmt=Periodic payment
FV=Future Value
*Due= 1 if payment due at beginning of a period and Due=0 if payment due at the end of a period.
The Interface

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The CodeIn our example, we are considering one single initial investment in order to earn a certain amount of money in the future, so Pmt is set to 0, and payment due is at the beginning of the period, so it is set at 0, the rest of the values are obtained from the users. Private Sub cmdCal_Click()
End Sub 
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