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 Cost of Procrastination Procrastination can be costly. When you get a late start, it may be difficult to make up for lost time. 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.