What Is My Life Expectancy? Estimate how many years you may need retirement assets or how long to provide income to a surviving spouse or children. 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 Question Thank you! Oops! Related Content Choosing a Retirement Plan that Fits Your Business To choose a plan, it’s important to ask yourself four key questions. My Retirement Savings Estimate how long your retirement savings may last using various monthly cash flow rates. 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.