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AWS Billing and Cost Management
User Guide (Version 2.0)

Reservation Details

You can use the reservation columns to find out more about a reserved resource. The columns include but are not limited to the following:

reservation/AvailabilityZone

The Availability Zone of the resource that is associated with this line item.

reservation/NormalizedUnitsPerReservation

The number of normalized units for each instance of a reservation subscription.

reservation/NumberOfReservations

The number of reservations that are covered by this subscription. For example, one Reserved Instance (RI) subscription might have four associated RI reservations.

reservation/ReservationARN

The ARN of the Reserved Instance (RI) that this line item benefited from.

reservation/TotalReservedNormalizedUnits

The total number of reserved normalized units for all instances for a reservation subscription. AWS computes total normalized units by multiplying the reservation/NormalizedUnitsPerReservation by the reservation/NumberOfReservations.

reservation/TotalReservedUnits

The total number of reserved units in a subscription. For a Reserved Instance (RI), this is the total number of hours across all RIs in this subscription. This is calculated by multiplying the NumberOfReservations by the UnitsPerReservation.

reservation/UnitsPerReservation

The number of usage units reserved by a single reservation in a given subscription, such as how many hours a single Amazon EC2 RI has reserved.

reservation/UnitsPerReservation

The number of usage units reserved by a single reservation in a given subscription, such as how many hours a single Amazon EC2 RI has reserved.

reservation/AmortizedUpfrontFeeForBillingPeriod

The initial upfront payment for All Upfront RIs and Partial Upfront RIs, amortized over this month. Because there are no upfront fees for No Upfront RIs, the value for No Upfront RIs is 0.

This tells you how much the upfront fee for this reservation costs you for this billing period.

reservation/unusedQuantity

The number of RI hours that you didn't use during this billing period.

reservation/UnusedNormalizedUnitQuantity

The number of unused normalized units for a size-flexible regional RI that you didn't use during this billing period.

reservation/unusedRecurringFee

The recurring fees associated with your unused reservation hours for Partial Upfront and No Upfront RIs.

Because All Upfront RIs do not have recurring fees greater than 0, the value for All Upfront RIs is 0.

reservation/UnusedAmortizedUpfrontFeeForBillingPeriod

The amortized portion of the initial upfront fee for All Upfront RIs and Partial Upfront RIs. Because there are no upfront payments for No Upfront RIs, the value for No Upfront RIs is 0.

reservation/AmortizedUpfrontCostForUsage

The initial upfront payment for All Upfront RIs and Partial Upfront RIs amortized for usage time. Because there are no upfront payments for No Upfront RIs, the value for a No Upfront RI is 0.

reservation/RecurringFeeForUsage

For Partial Upfront RIs and No Upfront RIs, this is the recurring fee amortized for usage time. Because All Upfront RIs do not have recurring fee payments greater than 0, the value for All Upfront RIs is 0.

reservation/EffectiveCost

The total effective cost of your usage with RI rates applied. This is calculated by taking the amortizedUpfrontCostForUsage and adding it to the recurringFeeForUsage.