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 Message Thank you! Oops! Related Content A Look at Systematic Withdrawals This calculator may help you estimate how long funds may last given regular withdrawals. FIRE Retirement This short, informative article teaches the basics of the FIRE movement. The Long Run: Women and Retirement For women, retirement strategy is a long race. It’s helpful to know the route.