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Computer information systems have in recent years found increasing applications in all facets of human endeavor owing to the rapid improvement in processing and storage technologies, the advent of the internet, as well as availability and reduced costs of computing resources. Consequently, organizations and businesses heavily depend on computer information systems and the internet to effectively manage their operations which often contain proprietary, confidential and safety critical information, which exposes important computing resources and information assets to security threats. This paper examines different quantitative information security risk assessment methodologies used to protect and/or manage organizational information systems from physical and cyber-attacks. The authors then developed a mobile, intuitive, interactive and user-friendly tool, the Mobile Risk Calculator, that visualizes the entire …