The earthquake risk or damage potential of an area is due to a combination of seismic hazard, vulnerability of the built environment and its exposure. The damage during recent earthquakes worldwide has demonstrated the need for seismic risk assessment for disaster management applications. It is also often observed that the complex risk assessment carried out in the scientific domain does not easily provide information and data amenable to policy making or for disseminating seismic risk to the public. In this paper, a newly developed GIS-based system for seismic risk assessment, namely RISK.iitb, has been described. RISK.iitb quantifies seismic hazard, structural vulnerability, and exposure and loss estimation. The system consider the requirements of the disaster management community, and results can be easily understood by various stakeholders while maintaining scientific rigour. An example analysis has been performed for Mumbai municipal region to illustrate the uses of RISK.iitb.