Radius (Risk Assessment Tools for Diagnosis of Urban Areas against Seismic Disasters) is a tool, which has been extensively used for risk assessment by different groups or agencies or researchers. Radius tool is developed in United States by Geo-Hazard International (GHI). The United Nations, International Decade for Natural Disaster Reduction (IDNDR) in 1997 funded the Radius project, a spreadsheet-based earthquake loss estimation tool. Gangtok Municipal Corporation has recognized the need for enhancing the activities in earthquake risk reduction, but they lack the expertise and resources required. The municipality does not have the required spatial information to investigate the existing trend of urbanization, population growth rate, and the resulting level of building and vulnerability. The main aim of this paper is to implement Radius tool to assess the possible impact of upcoming seismic events and to evaluate earthquake risk scenarios for possible damage and systematic inventory of the elements at risk and their relative value and vulnerability assessment of Gangtok town.