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! Related Contents The Latte Lie and Other Myths Do you know these three personal finance sayings? 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.