# Optimizing your cost with rightsizing recommendations
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The rightsizing recommendations feature in Cost Explorer helps you identify cost-saving opportunities by downsizing or terminating instances in Amazon Elastic Compute Cloud (Amazon EC2). Rightsizing recommendations analyze your Amazon EC2 resources and usage to show opportunities for how you can lower your spending. You can see all of your underutilized Amazon EC2 instances across member accounts in a single view to immediately identify how much you can save. After you identify your recommendations, you can take action on the Amazon EC2 console.

**Note**  
We recommend that you use Cost Optimization Hub to identify cost optimization opportunities. For full details, see [Cost Optimization Hub](https://docs.aws.amazon.com/cost-management/latest/userguide/cost-optimization-hub.html).  
Rightsizing recommendations doesn't support billing transfer.

**Topics**
+ [Getting started with rightsizing recommendations](rr-getting-started.md)
+ [Using your rightsizing recommendations](rr-use.md)
+ [Sharing your rightsizing recommendations](csv-details.md)
+ [Understanding rightsizing recommendations calculations](understanding-rr-calc.md)
+ [Understanding reservations in Cost Explorer](ce-ris.md)
+ [Accessing reservation recommendations](ri-recommendations.md)