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 Average American Budget Learn about the average American budget in this fun and interactive piece. Paying Off a Credit Card Enter various payment options and determine how long it may take to pay off a credit card.