How to get a correct prognose on costs of ec-instances and rds service

Question

I created an Ec2-instance. This is related to an aurora mysql db-instance. I created this to launch a QA version of my application. 
Yesterday I made the instance and the RDS service. I checked how much it should cost me. Had the instance and rds up for around 3 hours. Set-up entry rules and created the database with some mock data, I really didn't do a lot. Afterwards I shut down the instance.

Today my billling is updated, but the calculated pricing is much higher than I expected. My problem is that I can see the total pricing of the RDS and than of the EC2-instance. But I cannot get a detail of how that is calculated. How can I get this specific detail of billing? I would want to see how they come the pricing.

Example: USD 0.14 per Aurora Capacity Unit hour running Aurora MySQL Serverless v2    15.161 ACU-Hr //	TOTAL USD 2.12

This line says it costs 0,14 usd per hour. But it only ran 3 hours, how can it get to 2,12 ? But this is the maximum detail  I can find.

Because at current consumption rate, I need to find something else than AWS to do this.

Answer

Note that $0.14 is ACU hour, not Hour. It depends on how long did it remain 5 ACUs or more (depending on the maximum ACU set on the database and how much it had scaled up to) .  Let's say it scaled up to 5 ACUs for 3 hours, it will be 5 x 0.12 per ACU-hour x 3 = $1.8. I assume the minimum you set on the database is 0.5. What is the maximum ACU set?

Answer

Hi

*Use this to calculate the Cost of the Infra*: https://calculator.aws/

* Explore cost breakdowns by service (EC2, RDS) and specific charges in the free **Cost Explorer tool**. Access it through the Billing and Cost Management console: https://docs.aws.amazon.com/cost-management/latest/userguide/what-is-costmanagement.html
* EC2 & RDS Pricing: Cost depends on instance type, on-demand vs reserved, and region (EC2) or instance class, storage type, and IOPS (RDS).
See pricing pages for details:
EC2: https://aws.amazon.com/ec2/pricing/
RDS: https://aws.amazon.com/rds/pricing/

> Free Tier: If you're new to AWS, you might still be eligible for the free tier, which includes limited usage of EC2 and RDS instances.

[Look here Free Tier ](https://aws.amazon.com/free/?all-free-tier.sort-by=item.additionalFields.SortRank&all-free-tier.sort-order=asc&awsf.Free%20Tier%20Types=*all&awsf.Free%20Tier%20Categories=*all)

Answer

I took the lowest. I don't think it supposed to scale up just to create a few tables. Why don't they describe anywhere how I can calculate how to measure my ACU hour?

How to get a correct prognose on costs of ec-instances and rds service

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