How many EC2 instances can be launched in an AWS account

 The number of EC2 instances you can launch in an AWS account depends on the vCPU-based limits set for your account. Here are the key points:

  • AWS uses vCPU-based limits for On-Demand EC2 instances, rather than instance-count based limits. This provides more flexibility in how you utilize your compute resources.

  • The vCPU-based limits are set on a per-region basis for your AWS account. The actual limits can vary based on factors like your AWS account type, usage history, and support plan.

  • To check your current vCPU-based limits, you can use the AWS Management Console, AWS CLI, or AWS SDKs. For example, you can use the 

    describe-account-attributes
     CLI command to view your current limits.

  • If you need to increase your vCPU-based limits, you can request a service limit increase through the AWS Support Center or by contacting AWS Support.


vCPU-based limits refer to the way AWS manages the limits or quotas for the number of EC2 instances and other compute resources that can be used in an AWS account. Here are the key points about vCPU-based limits:

  1. Transition to vCPU-based Limits: In October 2019, AWS transitioned all accounts to use vCPU-based limits for On-Demand EC2 instances, replacing the previous instance-count based limits.

  2. Availability: The vCPU-based limits are available in all commercial AWS Regions, except the AWS China (Beijing and Ningxia) Regions.

  3. Limit Calculation: The vCPU-based limits are calculated based on the number of virtual CPUs (vCPUs) provisioned by the EC2 instances, rather than the number of instances. You can use the vCPU mapping for each EC2 instance type or the vCPU Calculator to estimate your total vCPU limit requirements.

  4. Benefit of vCPU-based Limits: With vCPU-based limits, you can more easily forecast, manage, and request quotas based on the vCPUs provisioned by your applications, rather than the number of instances. This provides more flexibility in how you utilize your compute resources.

  5. Regional Limits: The On-Demand Instance vCPU-based limits are set on a per-region basis for your AWS account.

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