You can use the FV (future value) function. See this example (copied from the VB help):
Dim Fmt, Payment, APR, TotPmts, PayType, PVal, FVal
Const ENDPERIOD = 0, BEGINPERIOD = 1 ' When payments are made.
Fmt = "###,###,##0.00" ' Define money format.
Payment = InputBox("How much do you plan to save each month?")
APR = InputBox("Enter the expected interest annual percentage rate.")
If APR > 1 Then APR = APR / 100 ' Ensure proper form.
TotPmts = InputBox("For how many months do you expect to save?")
PayType = MsgBox("Do you make payments at the end of month?", vbYesNo)
If PayType = vbNo Then PayType = BEGINPERIOD Else PayType = ENDPERIOD
PVal = InputBox("How much is in this savings account now?")
FVal = FV(APR / 12, TotPmts, -Payment, -PVal, PayType)
MsgBox "Your savings will be worth " & Format(FVal, Fmt) & "."
If not the correct formula, open the VB help for the FV function and see the "See also" link. You have plenty of financial functions alread alvailable.
To find a formula for future value, we'll write P for your starting principal, and r for the rate of return expressed as a decimal. (So if the interest rate is 5%, r equals .05).
Your balance will grow according to the following schedule:
Year Balance
Now P
1 P + rP
2 (P + rP) + r(P + rP)
This starts to get messy in a hurry. But you can simplify it by noticing that you can keep pulling out factors of (1 + r) from each line. If you do that, the balances collapse to a simple pattern:
Year Balance
Now P
1 P(1 + r)
2 P(1 + r)2
If you follow this pattern out for n years, you get the general formula for future value:
Hi jennflock@devx,
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public function FA(r as long, a as long, n as long)
dim tempL as long
dim i as long
i = 1
do until n = i - 1
templ = templ + (a * (1 + r)) ^ (n - I)
i = i + 1
loop
end function