The Rule of 72 Do you know how long it may take for your investments to double in value? The Rule of 72 is a quick way to figure it out. Related Content Preparing for the Expected You can plan ahead to protect yourself and your family against the financial consequences of deteriorating health. Estimate Your RMD Help determine the required minimum distribution from an IRA or other qualified retirement plan. An Inside Look at Retirement Living A number of questions and concerns need to be addressed to help you better prepare for retirement living.