I'm not understanding how the partial upfront work for ec2 reserved instances. I'm trying to calculate how much the instance will cost on one year.
If, for example, I add an m4.xlarge instance reserved for one year with partial upfront on AWS Calculator it returns the following information on the estimate tab:
Amazon EC2 Service (US-East): 702.02
- Compute: 54.02
- Reserved Instances (One Time Fee): 648.00
Total One-Time Payment: 648.00
Total Monthly Payment: 54.02
My doubt is if the monthly payment is included in the first month.
Should I calculate the cost of an entire year as 648 + 12 * 54.02? Or the cost is 648 + 11 * 54.02?