Lifetime of Earnings Estimate how much you have the potential to earn during your working years. 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 Put It in a Letter A letter of instruction provides additional and more personal information regarding your estate. Should I Pay Off Debt or Invest? This calculator will help determine whether you should invest funds or pay down debt. Estate Management 101 A will may be only one of the documents you need—and one factor to consider—when it comes to managing your estate.