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 Question Thank you! Oops! Related Content Should I Buy or Lease an Auto? This calculator compares the financial impact of leasing versus buying an automobile. When Special Care Is Needed: The Special Needs Trust A special needs trust helps care for a special needs child when you’re gone. Long-Term-Care Needs Determine your potential long-term care needs and how long your current assets might last.