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. Related Content Should I Pay Off Debt or Invest? This calculator will help determine whether you should invest funds or pay down debt. Retiring the 4% Rule A portfolio created with your long-term objectives in mind is crucial as you pursue your dream retirement. The Business Cycle Understanding the economy's cycles can help put current business conditions in better perspective.