Abstract: Background: Sri Lanka provides a free public health care service to its permanent residents. Currently Sri Lankan health care system is in the process of using EMR systems both public and private sector healthcare institutions. There are few published data available regarding cost-benefits of EMR in profit seeking institutes in some countries and no published data on non-profit seeking institutes. Therefore, main objective of the study is to perform a cost benefit analysis (CBA) of EMRs in the public health care system in Sri Lanka and secondary objectives are to evaluate the perception of EMRs among patients, health care professionals and supporting staff.