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 Working With A Financial Professional A financial professional is an invaluable resource to help you untangle the complexities of whatever life throws at you. Roth 401(k) vs. Traditional 401(k) This calculator compares employee contributions to a Roth 401(k) and a traditional 401(k). Pullbacks, Corrections, and Bear Markets When the market experiences volatility, it may be a good time to review these common terms.