I have seen people that do a ratio of 1.5:1. I have seen others who will go up as high as 8-10 vCPU (or higher). For me, I honestly take the data of CPU utilization on the application servers I will be running in my new environment and build out from there. If this is your first time you could take things a little slower as you introduce them into the environment and see how the host handles the load and go from there. Worst case scenario is you add another host to your cluster/environment. You just want to be sure that your CPU Ready stats are very very low (or zero).
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