Yeah, shame that it's one year only. Based on the pricing list it's limited to a few instances not for all. More on reddit.com

Do some calculations yourself and don’t just trust the calculator. Once you buy it, you are locked in. If your usage goes down, you still pay, if you buy for 3 years, you are on the hook for 3 years. Make sure it covers what you need it to. A lot of services have been rolled into savings plans like lambdas, but RDS, OpenSearch and some others still need separate reserved instances. It is a bit better now with the 1 week policy allowing you to adjust and change your mind. https://aws.amazon.com/about-aws/whats-new/2024/03/aws-7-day-window-return-savings-plans/ I’m really hoping they roll that out to reserved instances after my experience buying RIs in the wrong region. More on reddit.com

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Hi, I do this for a living :-) For most organisations, it's a good idea to commit to a compute plan somewhere below the perfect number at first. 50% is a good start. This allows you to scale down significantly without hitting that commitment if you find other ways to save money on compute. You can always add a further commitment down the line. Staggering your hourly commitment also means you don't have the entire commitment expiring at once, so if you forget to renew you don't get bill shock. Do note that instance savings plans offer better discounts than compute plans, so they are recommended for EC2 instances that you're expecting will be up 24x7 for the next 12 months (the payoff is actually at the 9 month mark ish, but people hate paying for instances they aren't using, even if they've already saved enough to cover it). The big advantage of compute plans is the added flexibility - they just allow you to say "I'm going to spend at least $x on some kind of compute - give me a discount". You don't have to worry about region, family OS or even service. I always advise my clients not to be too complacent about it though, or you're going to end up paying more than you need to. More on reddit.com