ISMS risk calculation

The main standard for information security risk management is the ISO 27005, which you can see a preview at this link: https://www.iso.org/standard/75281.html

These articles will provide you further explanation about risk identification and calculation:
- ISO 27001 risk assessment & treatment – 6 basic steps https://advisera.com/27001academy/knowledgebase/iso-27001-risk-assessment-treatment-6-basic-steps/
- ISO 27001 risk assessment: How to match assets, threats, and vulnerabilities https://advisera.com/27001academy/knowledgebase/iso-27001-risk-assessment-how-to-match-assets-threats-and-vulnerabilities/
- How to assess consequences and likelihood in ISO 27001 risk analysis https://advisera.com/27001academy/iso-27001-risk-assessment-treatment-management/#assessment

These materials will also help you regarding risk identification and calculation:
- The basics of risk assessment and treatment according to ISO 27001 [free webinar] https://advisera.com/27001academy/webinar/basics-risk-assessment-treatment-according-iso-27001-free-webinar-demand/
- Book ISO 27001 Risk Management in Plain English https://advisera.com/books/iso-27001-annex-controls-plain-english/