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 Power of Compound Interest Learn how to harness the power of compound interest for your investments. The History of Currency Currency has been around for a long time. Here’s a quick history lesson. Paying Off a Credit Card Enter various payment options and determine how long it may take to pay off a credit card.