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. Have A Question About This Topic? Name Email Address Question Thank you! Oops! Related Content Bull and Bear Go To Market Learn about the difference between bulls and bears—markets, that is! Paying Off a Credit Card Enter various payment options and determine how long it may take to pay off a credit card. Mutual Funds vs. ETFs Exchange-traded funds have some things in common with mutual funds, but there are differences, too.