Thank you for reaching out
The RI only applies to one on-demand EC2 instance using an m4.large instance class. RI billing continues to count even when the instance is in a stop state. However, when using on-demand instance, you only pay for the number of hours the instance is in an active state.
Please note that you will be charged 1 year full RI rate for the 1st instance and on-demand rate for the 2nd instance.
Here is a documentation on Reserved Instances for more information:
You can refer to the link below for the simple monthly calculator:
Thank you. That helps.
Edited by: sst on Oct 16, 2019 5:30 AM
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