Researchers and companies are paying increasing attention to corporate social responsibility (CSR) programs and the reaction to them by consumers. But despite such corporate efforts and an expanding literature exploring consumers' response to CSR, it remains unclear how consumers perceive CSR and which "Gestalt" consumers have in mind when considering CSR. Moreover, academics and managers lack a tool for measuring consumers' perceptions of CSR. This research explores consumers' perceptions of CSR and develops a measurement model for them. Based on qualitative data from interviews with managers and consumers, a conceptualization of consumers' perceptions of CSR is developed. Subsequently, this model is tested and validated on three large quantitative data sets. The conceptualization and the measurement scale help companies assess consumers' perceptions of CSR relative to their performance. They also enable managers to identify shortcomings in CSR engagement and/or communication. Finally, the paper discusses implications for marketing practice and future research.