A Look at Systematic Withdrawals This calculator may help you estimate how long funds may last given regular withdrawals. 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 Three Key Questions to Answer Before Taking Social Security When to start? Should I continue to work? How can I maximize my benefit? Federal Income Tax Use this calculator to estimate your income tax liability along with average and marginal tax rates. My Retirement Savings Estimate how long your retirement savings may last using various monthly cash flow rates.