Users can purchase virtualized computer resources using the cloud computing concept, which is a novel and innovative way of computing. It offers numerous advantages for the IT and healthcare industries over traditional methods. However, the widespread adoption of cloud computing across industries is being hampered by a lack of trust between CSUs and CSPs. Since cloud computing offers a wide range of security models and strategies, it is essential to analyse the service using a detailed methodology in order to choose the appropriate cloud service for various user types. Finding a wide variety of comprehensive elements that are both required and sufficient for evaluating any cloud service is vital in order to achieve that. As a result, this study suggested an accurate, optimized fuzzy logic-based trust evaluation model for cloud computing security. Here, we examine how fuzzy logic raises the efficiency of trust evaluation. Trust is assessed using the Quality of Service (QoS) characteristics of Security, Privacy, Dynamicity, Data Integrity, and Performance. The outcomes of a MATLAB simulation demonstrate the viability of the suggested strategy in a cloud setting.