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. Share | Related Content Jane Bond: Scaling the Ladder Agent Jane Bond is on the case, uncovering the mystery of bond laddering. Investing with Your Heart For some, the social impact of investing is just as important as the return, perhaps more important. How Compound Interest Works Use this calculator to better see the potential impact of compound interest on an asset.