Should I Pay Off Debt or Invest? This calculator will help determine whether you should invest funds or pay down debt. You are viewing this website at a small screen resolution which doesn't support calculators. Click here to view this calculator. Related Content Personal Finance Tips for Military Families Military families face unique challenges, making personal finance even more critical. My Retirement Savings Estimate how long your retirement savings may last using various monthly cash flow rates. Leaving Your Lasting Legacy Want to do more with your wealth? You might want to consider creating a charitable foundation.