A company plans to move all on-premises systems to AWS and wants an estimate of the cost to run their current setup in the cloud. Which AWS tool or framework should they use to get that cost estimate?

The AWS Pricing Calculator is the correct tool because it allows users to estimate the cost of their AWS services. You can input details about your planned infrastructure (e.g., EC2 instances, storage, data transfer) and receive a detailed cost breakdown. The AWS Well-Architected Framework provides guidance on building secure, high-performing, resilient, and efficient infrastructure, but it doesn't estimate costs. The AWS shared responsibility model defines security responsibilities between AWS and the customer, not cost estimation. The AWS Cloud Adoption Framework (AWS CAF) helps organizations develop a comprehensive plan for cloud adoption, focusing on strategy and people, not specific cost calculations.