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 How Big is Money? Learn a little about worldwide currency in this fun infographic What Is My Life Expectancy? Estimate how many years you may need retirement assets or how long to provide income to a surviving spouse or children. Best-Performing Asset Classes Bonds may outperform stocks one year only to have stocks rebound the next.