Doubling Your Money This calculator demonstrates the power of compound interest. You are viewing this website at a small screen resolution which doesn't support calculators. Click here to view this calculator. Share | Have A Question About This Topic? Name Email Address Message Thank you! Oops! Related Content What Our Kids Can Teach us About Saving Money Would you guess that Millennials are effectively saving for retirement? Well, they are. Password Protection Strategies Simple steps may help you foil hackers and protect your privacy. Paying Off a Credit Card Enter various payment options and determine how long it may take to pay off a credit card.