An annuity is an investment that provides a series of payments in exchange for an initial lump sum. With this calculator, you can find several things:   The payment that would deplete the fund in a given number of years.   The amount needed to generate a specific payment.   The rate of return needed to generate a specific payment.   The number of years your investment will generate payments at your specified return. 
To calculate, just select the initial payment interval you desire and fill in any 3 other boxes.
