I want to know how my Amazon Elastic Compute Cloud (Amazon EC2) Reserved Instances apply to my bill if they are size flexible.

To find out if your Reserved Instance is size flexible, see How do Amazon EC2 Reserved Instances that are regional or size flexible work?

If your Reserved Instance is size flexible, the following considerations apply:

  • Your Reserved Instance will apply to usage for any instance in its family of its same size or smaller. For example, if you purchase a Reserved Instance for an m3.large instance, it also applies to m3.medium instances.
  • Multiple smaller Reserved Instances also combine to apply to larger instances. For example, if you purchase a Reserved Instance for two m3.large instances, they are combined to cover an m3.xlarge instance, provided that neither of the Reserved Instances already applies to an m3.large instance.
  • Reserved Instances can't be set to apply to specific instances. For example, if you're running multiple combinations of instances that a particular Reserved Instance can apply to, you can't designate which of these combinations receives the benefit of the Reserved Instance.

If you're in an organization with multiple accounts under a consolidated bill, additional considerations can apply. For more information, see How is the pricing benefit of a Reserved Instance applied across an organization's consolidated bill?

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Published: 2017-06-16

Updated: 2018-06-28