How compute saving plan going to be adjusted?

Question

I am very much confused in terms of how saving plan going to be adjusted between those instances?
As an example, if we purchased 4 instances, each instance would cost **$5** per hour and a saving plan would cost **$4**, so we purchased a **compute saving plan** by committing **$13** per hour How this saving plan will be adjusted between those instances?  Since 3 instances would consume **$12** how **$1** going to be adjusted? because we have purchased Rs.13 per hour saving plan?

weidi · Accepted Answer

Thanks for the detailed description.

---
Assuming that,

```
4 instances = 4 units
On-Demand rate = $5
Compute Savings Plans rate = $4
```

$13 commitment covers 3.25 units ($13/$4), and the remaining 0.75 unit will be charged at On-Demand rate $5. Here is a similar scenario for your reference: https://docs.aws.amazon.com/savingsplans/latest/userguide/sp-applying.html#scenario-2

As a side note, if instance types are mixed, Savings Plans apply to the usage starting with the highest discount percentage.

How compute saving plan going to be adjusted?

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