Infrastructure Sizing Calculator
Nodes needed for peak load at a sane utilisation target, and with a whole failure domain lost.
Sizes for peak load at a sane utilisation target, and for losing an entire failure domain. Both are routinely left out, which is why capacity plans look fine until a zone goes down.
Queueing delay rises sharply near saturation. Sizing to 100% gives you a system that is adequate on paper and unusably slow.
It runs entirely in your browser and nothing you type is transmitted or stored. The output is indicative and derived from your own inputs, so it is only as good as they are. It is educational material, not professional, financial, legal or tax advice, and it is not an audit, a quote or a substitute for review by someone who can see your actual environment.