Amortized, Blended, and Unblended Costs

When configuring reports, you have an option to show costs as amortized, blended, or unblended.

AWS

The Amortized view distributes any up-front fees and monthly installments evenly across the reservation period. This is useful because when you purchase EC2 reservations, your costs are recorded at the time they are charged. They’ll appear as a single charge on that day, distorting the scale of the cost axis. Because other EC2 usage costs can be so much lower than the reservation fees, they almost disappear from the chart and you won’t be able to see spending trends. To solve this problem, use the Amortized view.

If you have consolidated multiple AWS accounts into a single billing account and have reserved instances that are shared across those accounts, you can view your costs on an unblended or blended basis.

Unblended costs are the sum of the applicable rates times usage for each AWS resource. They represent the usage costs on the day they are charged to you.

Blended costs are the averaged rates of the reserved and on-demand instances that are used by member accounts. The blended view recognizes relative usage of reserved instances. Accounts that make more use of reserved instances will be allocated a higher proportion of those overall costs. Note that if you only have one account, if you don’t have consolidated billing set up, or if you don’t use a reserved instance, then the blended and unblended costs will be the same and reflect the simple usage costs.