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 The Latte Lie and Other Myths Do you know these three personal finance sayings? 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.