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. Related Content Net Unrealized Appreciation (NUA) Explained Have you considered the special tax treatment on company stock held in a 401(k) plan? Estimating the Cost of College This worksheet can help you estimate the costs of a four-year college program. 9 Facts About Retirement Regardless of how you approach retirement, there are some things about it that might surprise you.