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 | Related Content Keeping Up with the Joneses Lifestyle inflation can be the enemy of wealth building. What could happen if you invested instead of buying more stuff? How Big is Money? Learn a little about worldwide currency in this fun infographic What Is My Current Cash Flow? Assess whether you are running “in the black” or “in the red” each month.