How much will an AWS Compute Savings Plan cover? I have 4 instances.

Question

I'm new to AWS savings plans, and I'm having trouble understanding how to determine what it will cover. Or, more accurately, what it won't cover, so I can purchase additional SPs.

I currently have (4) EC2 instances running 24/7. Two are Linux, two are Windows, and all four are in the t3 instance class. I purchased one savings plan with a one-year commitment and a commitment rate of $0.123/hr.

I guess where my confusion lies is how to correlate the SP CR of $0.123 with my instances since they are different classes and thus they have variable SP rates. For reference, the SP rate for my instances are: $0.0083, $0.015, $0.0511, $0.0511.

How can I determine how many hours of my four instances the SP CR will ultimately cover in a month? My goal is to ensure that all of my EC2 instance utilization is covered by an SP.

Answer

Compute Savings Plans provide the most flexibility and help to reduce your costs by up to 66%. When you purchased , one savings plan with a one-year commitment rate of $0.123/hr.These plans automatically apply to EC2 instance usage regardless of instance family, size, AZ, Region, OS or tenancy, and also apply to Fargate or Lambda usage
* Savings Plan is first applied to the account that purchased the savings plan and then it is shared to other accounts in the consolidated billing family.
* Let consider you have t2.micro and (Linux) and t2.medium ( Windows) Your Savings Plans are first applied to the t2.micro  (Linux) it has highest discount percentage ( 28%). Reference document [1]. Which means  your commitment rate of $0.123/hr applies to t2.micro instance and rest will apply to t2.medium . 
You can review your coverage report on Cost Explorer console. 
and how the report is calculated available on below document[2]

[1]https://docs.aws.amazon.com/savingsplans/latest/userguide/sp-applying.html

[2]https://docs.aws.amazon.com/savingsplans/latest/userguide/ce-sp-usingCR.html

How much will an AWS Compute Savings Plan cover? I have 4 instances.

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