What exactly is the unit "GB-month" in AWS terminology?

Question

Amazon EBS volumes are billed by the gigabyte-month (GB-month). With Amazon Elastic Block Store (EBS), you pay only for what you provision. Volume storage for all EBS volume types is charged by the amount of GB you provision per month until you release the storage.

There is so much confusion in these statements, and I wonder how exactly EBS is billed and what exactly is meant by the unit "GB-Month"? I could see this unit is also associated with Amazon Aurora storage pricing.

Links:-

https://aws.amazon.com/ebs/pricing/

https://aws.amazon.com/rds/aurora/pricing/

Answer 1

A GB-Month is 1GB of storage for 1 month.

• 100GB stored for 1 month = 100 GB-Months
• 100GB stored for half a month = 50 GB-Months

It's similar to the electricity concept of Kilowatt-Hours (1kWh = 1kW for 1 hour).