On-Demand DB instances for Amazon RDS
Amazon RDS on-demand DB instances are billed based on the class of the DB instance (for example, db.t3.small or db.m5.large). For Amazon RDS
pricing information, see the Amazon RDS product page
Billing starts for a DB instance as soon as the DB instance is available. Pricing is listed on a per-hour basis, but bills are calculated down to the second and show times in decimal form. Amazon RDS usage is billed in one-second increments, with a minimum of 10 minutes. In the case of billable configuration change, such as scaling compute or storage capacity, you're charged a 10-minute minimum. Billing continues until the DB instance terminates, which occurs when you delete the DB instance or if the DB instance fails.
If you no longer want to be charged for your DB instance, you must stop or delete it to avoid being billed for additional DB instance hours. For more information about the DB instance states for which you are billed, see Viewing Amazon RDS DB instance status.
Stopped DB instances
While your DB instance is stopped, you're charged for provisioned storage, including Provisioned IOPS. You are also charged for backup storage, including storage for manual snapshots and automated backups within your specified retention window. You aren't charged for DB instance hours.
Multi-AZ DB instances
A Multi-AZ setup enhances data durability and availability by automatically provisioning and maintaining a synchronous standby replica in a different Availability Zone. Due to the additional resources and increased availability, Multi-AZ deployments are priced higher than Single-AZ deployments, and can cost approximately twice as much due to the additional standby instance and associated resources.
Consider the following important details about Multi-AZ pricing:
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Compute costs: Billed per DB instance-hour for both the primary and standby instances.
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Storage costs: Charged per GB-month for the storage provisioned for both the primary and standby instances.
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Data transfer costs: Replication between the primary and standby instances is included in the cost, but other data transfer charges might apply based on your usage.
To accurately estimate your monthly costs based on your specific use case and AWS Region, you can use the AWS Pricing Calculator. This tool lets you to input your configuration details and provides a comprehensive cost breakdown.
Note
Pricing is subject to change. See the Amazon RDS Pricing page
