The purpose of this paper was to develop the Employee Resource Groups Scale (ERGS) that measures employee perceptions of the efficacy of employee resource groups. The study aimed to develop a perceptions of employee resource groups scale. The authors recruited data from 268 participants from a for-profit organization in the United States. An exploratory factor analysis (EFA) was used to examine the factor structure of the ERGS. Cronbach's alpha was used to determine the internal consistency of each factor. The EFA identified two factors: Employee Resource Group Outcomes (9 items), and Supervisory Support (2 items). There is a growing body of research that examines the activities and the efficacy of employee resource groups within for-profit organizations. The ERGS is a reliable measuring instrument that can capture perceptions of the outcomes of employee resource groups and how supervisory support influences the employees' participation in the employee resource groups.