Try this site where you can compare quotes from different companies: WWW.ANNUITY-HELP.US How do you calculate the future value of an ordinary annuity compounded semiannually? The general formula for an ordinary annuity is FV = PMT * (((1 + i) ^n - 1) / i) where FV = future value PMT = Amount of each payment i = interest rate per period n = number of periods With the semi-annual version, take the annual rate and divide by 2. Multiply the number of years by 2 to get n.