Return on investment (ROI) is a commonly used metric for organizations concerned with demonstrating the value of their investments; it can be used to determine whether funds spent providing professional development programs for Extension professionals are good investments. This article presents a method for calculating ROI for an onboarding program on the basis of the changes in competency levels from before to after program participation. Although limitations to the method exist, the data generated can be used for engaging in meaningful discussions about the value of investing in professional development in Extension organizations.