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AWS compute savings plan commitment calculation

I am trying to understand how the commitment per hour calculation has been done for AWS Savings plan recommendation for past 30 days. There is no document on how to calculate it, how is the calculation done for leaving the on-demand spend? As per the below usage of the services mentioned in below table, AWS cost explorer is recommending below commitment... "You could save an estimated $315 monthly by purchasing the recommended Compute Savings Plan. Based on your past 30 days of usage, we recommend purchasing 1 Savings Plan with a total commitment of $1.390/hour for a 1-year term. With this commitment, we project that you could save an average of $0.43/hour - representing a 17% savings compared to On-Demand. To account for variable usage patterns, this recommendation maximizes your savings by leaving an average $0.65/hour of On-Demand spend. Recommendations require up to 24 hours to update after a purchase." So we came to a conclusion that we should spend 0.65/hour of On-demand and 1.390/hour of commitment? Please suggest and share how we can calculate all this information if I need to do that with a different set of data. | Service| Intance family| instance type| No. of instances| Region | On-demand Spend ($) | On-demand Usage | On-demand rate | SP rate | SP Spend | % discount | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | EC2 | t2| micro | 1 | US East (N. Virginia) | 8.352| 720| 0.0116 | 0.0078 | 5.616 | 33% | | EC2 | t2| nano | 1 | EU (Ireland) | 4.536 | 720 | 0.0063 | 0.0048 | 3.456 | 24% | | EC2 | t2 | micro | 6 | EU (Ireland) | 53.837658 | 4,272.83 | 0.0126000000 | 0.0095 | 40.591885 | 25% | | EC2 | t2 | large | 1 | EU (Ireland) | 72.576 | 720 | 0.1008 | 0.0761 | 54.792 | 25% | | EC2 | c6a | large | 1 | EU (Ireland) | 38.4495552| 468.44 | 0.08208 | 0.05854 | 27.4224776 | 29% | | EC2 | c4 | 4xlarge | 1 | EU (Ireland) | 421.73| 466 | 0.905 | 0.667 | 310.822 | 26% | | Fargate | | GB-Hours | | EU (Ireland) | 224.9872755| 50615.81 | 0.0044450000 | 0.0034671 | 175.4900749 | 22% | | Fargate | | vCPU-Hours | | EU (Ireland) | 916.9323152 | 22651.49 | 0.0404800000 | 0.0315744 | 715.2072059 | 22% | | Lambda | | EU-Lambda-GB-Second (Second) | | EU (Ireland) | 28.250059 | 1695000.15 | 0.0000166667 | 0.0000138 | 23.39100207 | 17% | | Lambda | | EU-Request (Requests) | | EU (Ireland) | 0.94 | 4688540 | .20 | .20 | 0.94 | 0% | | **Total **| | | | | 1770.590863 | | 1.363321667 | 1.0587953 | 1357.728645 | |
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