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? Address Thank you! Oops! Test Your Investment Knowledge! How much do you know about investing? Take our quiz and find out instantly. First Name Last Name Email Address Thank you! Oops! Related Contents Saving for College 101 Here’s a crash course on saving for college. The Lowdown on Those Free Credit Scores What’s the deal with your yearly free credit report? Historical Inflation This calculator shows how inflation over the years has impacted purchasing power.