The Reserved Instance Utilization and Coverage reports are available out-of-the-box in AWS Cost Explorer. Using these reports, you can set custom RI utilization and coverage targets, visualize how well you are tracking towards your goals, and access information associated with your savings as compared to On-Demand prices. From there, you can refine the underlying data using the available filtering dimensions (e.g. account, instance type, scope, and others) to grain greater insight into your reservations.