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. Share | Have A Question About This Topic? Name Email Address Message Thank you! Oops! Related Content Retirement Redefined Around the country, attitudes about retirement are shifting. When Should You Take Social Security Monthly Social Security payments differ substantially depending on when you start receiving benefits. A Look at Systematic Withdrawals This calculator may help you estimate how long funds may last given regular withdrawals.