AWS Billing and Cost Management
User Guide (Version 2.0)

Understanding Your Reservations With Cost Explorer

A significant part of using AWS involves balancing your Reserved Instance (RI) usage and your On-Demand Instance usage. To help with that, Cost Explorer provides a couple of tools to help you understand where your greatest RI costs are and how you can potentially lower your costs. Cost Explorer does this by providing you with an overview of your current reservations, showing your RI utilization and coverage, and calculating recommended RIs that could save you money if you purchase them.

Using Your RI Reports

You can use the RI reports page in the Cost Explorer console to see how many reservations you have, how much your reservations are saving you compared to similar usage of On-Demand Instances, and how many of your reservations are expiring this month.

Cost Explorer breaks down your reservations and savings by service and lists your potential savings: that is, the costs of On-Demand usage compared to what that usage could cost you with an RI.

To take advantage of your potential savings, see Accessing Reserved Instance Recommendations.

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