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 Question Thank you! Oops! Free Retirement Guide It's never too soon to start preparing for retirement. But do you know what to look out for? Download our free ebook, "Retire Happy: A Simple Guide to Your Next Big Adventure." First Name Last Name Email Address Thank you! Oops! Related Contents The Cost of Procrastination Procrastination can be costly. When you get a late start, it may be difficult to make up for lost time. Life and Death of a Twenty Dollar Bill How long does a $20 bill last? Your Cash Flow Statement A presentation about managing money: using it, saving it, and even getting credit.