My Retirement Savings Estimate how long your retirement savings may last using various monthly cash flow rates. You are viewing this website at a small screen resolution which doesn't support calculators. Click here to view this calculator. Have A Question About This Topic? Name Email Address Message Thank you! Oops! Related Content The Anatomy of an Index The S&P 500 represents a large portion of the value of the U.S. equity market, it may be worth understanding. What Is My Current Cash Flow? Assess whether you are running “in the black” or “in the red” each month. RE: Retirement How does your ideal retirement differ from reality, and what can we do to better align the two?