Monthly instace RDS db.t4g.small price much higher than expected

Question

I created a RDS Postgres db.t4g.small instance without Proxy with 100Gb of storage and, after the first month, the costs are much higher than estimated by the calculator (estimated: about $40, actual: $228) . Instance utilization was very low (6% cpu average).
What parameter am I leaving out in pricing or configuring the instance?

Answer

Have you considered the [backup storage cost](https://aws.amazon.com/rds/postgresql/pricing/?pg=pr&loc=3#Backup_Storage) ?

Answer

Federico, you mentioned 100Gb of storage, it does not matter the actual size of the DB used by you, the cost is calculated based on the instance hours(on demand) + the storage + any db backup(storage) you have created.
If you have a very small DB, I would suggest that you downsize your instance to a free tier, it will give you 750 hours of Amazon RDS and 20GB
Check out this link for more info[https://aws.amazon.com/rds/free/]()

Monthly instace RDS db.t4g.small price much higher than expected

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