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 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.